Scanning Somerset County, New Jersey

For all the municipalities or groups listed above, there is a table of the frequencies and a brief description of how they are used. The first field is the channel name and/or usage, the second column is the radio frequency, the third column is the type (R=repeater, B=base, M=mobile), and the fourth column is the squelch or modulation type (CSq = carrier squelch). A two-digit number in the last field represents an LTR LCN; any known associated talkgroups will be listed further down in the same table.

It is intended for all public safety (police/fire/EMS/OEM) and government (roads dept/building dept/schools) channels to be listed here, plus most business repeaters and other channels which may be of particular interest. Many business channels have intentionally been omitted because researching and processing them all would be impractical. If you are searching for one not listed, try the FCC database or check if they are using an undentified talkgroup on one of the SMRs. If you are searching for additional tactical channels used by a business which has repeaters shown, try the master frequency lists. If you find or know of anything which is not listed here, please e-mail them to the author so that others may benefit.

Businesses should be listed under the municipality they are principally located in. County-wide busineses like utilities may be listed under the County Other section or with the municipality in which the main transmitter is located.

Standard and regional channels have been omitted from this page for brevity and can be found on the General Mercer/ Middlesex/ Somerset County Channels page.

Good sources of additional information are:
• Somerset County official site.
• Frequency Lists (located at this site, includes more license data, excludes narratives).
• John Burricelli's Scanner Files (an exceptional resource for Somerset County & NJSP).
• Central-New-Jersey-Scanning Yahoo Group.
• RadioReference.com, particularly for trunked radio system information but increasingly for conventional data too.

Somerset County Trunked Radio System

Somerset County is currently operating a trunked radio system, with many users already on it and more being added occasionally. Frequencies are shown at left; there are three configurations for trunk-tracking scanners: Base1=500.3375, Offset1=380, Step1=25.0; Base2=501.9125, Offset2=430, Step2=25.0; Base3=502.5125, Offset3=450, Step3=25.0. If your scanner only supports one configuration then use 502.5125/450/25.0 and know that you will receive only about 80% of the communications; if your scanner only allows you to program in two pieces of data then use a base of 500.7625 and an offset of 25 and the same 80% will hold true. A "System Map" (XLS) is available with a great deal of technical information in the various tabs; TRUNKER files for the system are also available for advanced users (County is 8A27 cell 1, Franklin is 8A27 cell 2). Based on observations when the system was offline late on 9/10/06, it appeared that 500.8875 was not then integrated to it, nor were the other channels which may or may not be for future expansion.

Franklin Township's trunked system is treated separately on this web page, for simplicity's sake. In reality it is just a second zone or cell on the county's system. For the most part, so far, Franklin's talkgroups stay on Franklin's zone and the county's talkgroups stay on the county's zone. There have already been some exceptions to this already, though, including Public Safety Calling and Sheriff Dispatch coming over Zone 2 when a Franklin unit affiliated to those groups on Zone 2.

The system (Zone 1) has the following transmitter sites: Bernards on Pill Hill; Bridgewater on Mount Horeb Road; Bridgewater at Mount Prospect and Old Stagecoach Roads; "Green Brook" on Warrenville Road; Hillsborough at Rte 206 & Champlain Road; "Neshanic" on Zion Road; North Plainfield at Johnston Drive; Pottersville at Route 512 & Hacklebarney; "Rocky Hill" on Old Georgetown Road (AAT Tower in southern Franklin Twp); and Somerville on Grove Street. All these sites are simulcast; it is possible that some of the channels not yet in use will become specific-area fill-ins.

Some notes on the unidentified/unconfirmed talkgroups: 01616 is suspected to be a talkgroup which will open up any radio, a system-wide announcement channel. 09904 is, based on numbering, some sort of county service. 10320, 10352, and 10384 may be county services event talkgroups; the 4H fairs in 2005 and 2006 have been run using OEM loaner radios mostly on 10352 and a little on 10320. A series of talkgroups are in the numeric vicinity of the Fire Interop talkgroup (14960); they may be for other services' interops and/or events; Piscataway PD used loaner portables on 15088 when their system was briefly taken down for maintenance in August 2006. 32304 once had technicians installing or maintaining security cameras apparently at the courthouse.

Somerset County Law Enforcement / County-wide Police

The Sheriff's Department, Prosecutor's Office, and Park Rangers all operate on the trunked system. The table on the right lists all the relevant and identified talkgroups.

County dispatches a handful of police departments, many of which are now on the trunked system. For specific frequency or talkgroup information for each department, see that individual municipality's section on this web page.

The following are IDs for police units, some of which are dispatched by county and others by themselves:
• Able = Bedminster (trunked, by county)
• Baker = Bernards (VHF-High, self-dispatched)
• Charlie = Bernardsville (VHF-Low, self-dispatched)
• Delta(?) = Bound Brook (VHF-High, self-dispatched)
• Echo = Branchburg (VHF-High, by county)
• George = Far Hills (trunked, by county)
• Mike = Montgomery (not used, trunked, self-dispatched)
• Nancy(?) = North Plainfield (trunked, self-dispatched)
• Ocean = Peapack-Gladstone (trunked, by county)
• Rocky = SBBPD Rocky Hill Unit (trunked, by county)
• Sierra = South Bound Brook (trunked, by county)
• Victor = Raritan Valley Community College Security (not used, UHF, self-dispatched)
• Zebra = County Sheriff's Department (trunked, by county)

It is possible that currently-outdated and new IDs will be put to use if/when police departments move to the trunked system.

In late August or early September 2006 there was talk of "Delta" units switching to the trunked system in the near future, and separate talk of one department receiving training on 11/12 and switching over on 11/13. They may or may not be related. Some north police departments (including Bedminster, Far Hills, and Peapack-Gladstone) have done coverage testing on the PD North talkgroups.

Somerset County-wide Fire/ EMS/ OEM

Somerset County has gradually taken over dispatching of most in-county fire companies and first aid squads and consolidated their communications in conjunction with the switch-over to the new trunked system. A new UHF alerting/paging channel has been established along with the trunked system and many of the various old alerting and dispatch channels will be abandoned. One example is that county took over Montgomery's fire and EMS dispatching in the first quarter of 2006, and the 82.5 PL on fire-high is no longer used (on the Somerset dispatch side, at least; see Montgomery or Rocky Hill for more info).

County OEM, including the HazMat team, operates entirely on the trunked system.

The table on the right lists all the station numbers for Somerset County fire (-Fire or ##F) and EMS (-Rescue or ##R) stations; some now-defunct stations have been included to fill in gaps in the current numbering. Some stations are physically located outside Somerset County but are primary responders in and so have Somerset County numbers. "Municipality" is meant to indicate the Somerset County town the station is a primary responder for -- out-of-county towns and mutual-aid towns are not included. "Dist" indicates which fire district (if any) the company is a part of, because some areas are dispatched by district. NJFFS Section A7 is included for the sake of providing a link; they serve the area but do not in any way fall under the auspices of Somerset County.

A standardized numbering system has been set in place for apparatus on mutual aid assignments, and this system may be further implemented as agencies switch to the county-wide trunked system. The following numbers are prefixed by the station number:

C-1, C-2, ...: Officers, in decreasing rank
101-109: Engine
111-119: Truck
121-129: Tower/Aerial
131-139: Tender (Tanker)
141-149: Brush & Mini-pumper
151-159: Utility/Rescue/Lighting
161-169: Command
171-179: Ambulance

The trainers at the fire academy have been heard using Franklin's old F-7 for burn building ops. They may always use this channel, or pick a channel at the beginning of each session. They work off portables so you must be close in to receive it; if not Franklin's F-7 then try Hillsborough's tac channels and then other miscellaneous county tac and mutual aid channels. Eventually they may use the county's new UHF system, probably one of the tac channels but potentially one of the talkgroups. Fire companies drilling at the academy tend to use their ordinary channels, either ops or fireground depending on several factors.

Somerset County dispatches Somerset Medical Center's ALS units (681 & 682). RWJUH/SPUH medic units (MR1 & MR3) are still primary responders for parts of Somerset County and are dispatched by MedCentral (see Middlesex County for more info). EMS 1 & EMS 2 from Hunterdon, and certain LifeCom ALS units from Mercer County occasionally provide mutual aid.

Somerset County ARES is a part of the North NJ ARES Section.

Somerset County Other

Raritan Valley Community College has a few conventional channels. The county Health, Roads, Recycling, Transportation, Facilities & Services, and Traffic Safety Services departments all use the trunked system.

Bedminster Township

Bedminster Township's Police Department (Able units) is dispatched by county and apparently switched to the trunked system on Monday 9/18/06.

The Bedminster fire companies, Union Hook & Ladder Company #1 (AKA Far Hills-Bedminster Fire Dept., 29-Fire) and Pottersville Volunteer Fire Company (63-Fire), are paged out on the county's UHF alerting channel and operate on the trunked system.

The Far Hills-Bedminster First Aid Squad, 29-Rescue, is alerted on the county's UHF channel and operates on the trunked system.

Bernards Township

Bernards Township's Police Department is self-dispatched on a high-band repeater.

Bernards Township fire companies, including the Basking Ridge Fire Company #1 and the Liberty Corner Fire Company, are dispatched on a high-band repeater. Two high-band repeaters have been licensed, one by each fire company. It appears that the township assisted both with the licensure, and control points for both are at the police station (LCFC's license shows the repeater at their station). It is unclear what the intent of these channels is, whether to be main dispatch or a secondary coordination/ops channel, and whether they are presently in use.

EMS is provided to Bernards Township by the Basking Ridge Fire Company #1 First Aid Squad and the Liberty Corner First Aid Squad. The squads are dispatched on the same high-band repeater as the fire companies.

Bernards municipal communications were on a low-band channel. It is possible the unidentified high-band repeater is for them, so that they're on the same band as police and emergency services.

Bernards Township and Long Hill Township in Morris County have established a combined communications center for the two municipalities.

Bernardsville Borough

Bernardsville Borough's Police Department (Charlie units) is self-dispatched on low-band.

The Bernardsville Fire Company #1 & First Aid Squad, Station 22-Fire/Rescue, is dispatched by county on low-band, with pages being multicast on the new paging channel. The fire company has recently licensed repeaters on the same frequency as Long Hill Fire Department (PL=146.2), and notes on the license indicate they plan to work together to avoid interference.

Bernardsville Borough DPW operates on the same UHF repeater as neighboring towns.

Bound Brook Borough

Bound Brook Borough's Police Department is self-dispatched on the channel indicated, with the dispatcher identifying as '685' (as in KEB685). Based on some talk on the county's trunked system, it sounds like the BBPD may soon switch to it; this is by no means confirmed yet.

The Bound Brook Fire Department is comprised of four companies: Bound Brook Hose Company #1, American Hose & Engine Company #2, Watchung Fire Company #3, and Relief Fire Company #4. All, together, as Station 23-Fire, are dispatched by county to any and all calls. Paging is usually done off the Franklin tower (PL=100.0); the old dispatch channel/DPL is from when the borough handled it. All response and operations communications are conducted on the Ops channel or other tactical/fireground channels.

The Bound Brook Rescue Squad, 15-Rescue, is dispatched by 685 on the old police channel.

Bound Brook's municipal services use a high-band channel, which also serves as police tac and fireground.

Branchburg Township

Branchburg Township's Police Department is dispatched on a high-band repeater by county.

Branchburg is served by four fire companies:

General:

All are dispatched by county. All are also primary responders into other municipalities; the alerting channels do not vary but the following ops channels may be for Branchburg only. For ops in other towns, see notes under that town's section.

24-Fire Country Hills Volunteer Fire Company

Alerted on fire-low and operates on UHF repeater. Also is a primary responder into Bridgewater.

32-Fire Readington Volunteer Fire Company

Alerted on high-band, communicates with county on the trunked system. Also is a primary responder into Hunterdon County (Station 32 there too).

48-Fire Neshanic Volunteer Fire Company

Alerted on fire-high and operates on the trunked system, primarily on Dispatch Region 2 (see Fire/ EMS/ OEM for other talkgroups which may be used). Also is a primary responder into Hillsborough (in which case they operate on Hillsborough's channel).

49-Fire North Branch Volunteer Fire Company

Alerted on fire-low and operates on the UHF repeater. Also is a primary responder into Bridgewater.

The Branchburg Rescue Squad (74 Rescue) provides EMS services. Paging and dispatch is done by county on JEMS-3; internal coordination is done on their repeater.

Bridgewater Township

Bridgewater Township's Police Department is dispatched on a high-band repeater. F-2 through F-4 have not been confirmed (in fact, 3 and 4 do not appear to be licensed), but are reportedly for tactical communications; F-6 is an alternate channel for the PD, the DPW channel.

Bridgewater's fire companies are arranged as follows:

Fire District One

43-Fire Martinsville Fire Company #2

Alerted and operates on UHF.

Fire District Two

21-Fire Bradley Gardens Fire Department

Alerted and operates on UHF.

Fire District Three

24-Fire Country Hills Volunteer Fire Company

34-Fire Green Knoll Volunteer Fire Company (34-Fire)

49-Fire North Branch Volunteer Fire Company

Alerted on VHF, operates on UHF repeater and simplex channels. Note that 24 and 49 also respond as primary into Branchburg, and use the same channels there.

Fire District Four

30-Fire Finderne Engine Company #1

Alerted and operates on high-band.

BLS agencies serving Bridgewater are: Green Knoll Rescue Squad (34-Rescue); Finderne First Aid & Rescue Squad (35-Rescue); Bradley Gardens First Aid & Rescue Squad (39-Rescue); and Martinsville Rescue Squad (43-Rescue). Martinsville and Green Knoll are alerted and operate on their own repeater; Finderne and Bradley Gardens are alerted on 155.31 and operate on a separate repeater.

Far Hills Borough

Far Hills Borough's Police Department (George units) is dispatched by county. Dispatch apparently switched over from the conventional repeater to the trunked system on Monday 9/18/06.

Franklin Township

Franklin Township operates a mixed-mode trunked radio system. Frequencies are shown at left; there are two configurations for trunk-tracking scanners: Base1=471.0000, Offset1=380, Step1=12.5; Base2=476.2500, Offset2=540, Step2=12.5. A "System Map" (XLS) is available with a great deal of technical information in the various tabs; TRUNKER files for the system are also available for advanced users (County is 8A27 cell 1, Franklin is 8A27 cell 2).

The Franklin Police Department moved all their operations to the trunked system on 7/01/04, and all police talkgroups noted to date have been encrypted. The old, conventional infrastructure and ability on it has been maintained and used as a backup to the trunked system. The old police identifiers (possibly still in use) were: police cars= 800 series; chief= 2000; captain= 3000; lieutenant= 4000; sergeant= 5000; detective= 6000; beat officer= 7000; special officer= 8000; dispatcher= 9600.

Franklin PD has occasionally used old PD-1 for operations when maintenance is required on the trunked system. The department also used the analog "911 Access" talkgroup for routine dispatch around 10/20-22/06 for an unknown reason; the encrypted dispatch talkgroup and others were used at the same time for something else.

The Franklin fire companies are divided up as follows:

Fire District One (north)

26-Fire Elizabeth Avenue Fire Company

28-Fire Millstone Valley Fire Department

44-Fire Middlebush Volunteer Fire Department

56-Fire Somerset Volunteer Fire & Rescue Company #1

Fire District Two (south/central)

31-Fire Franklin Park Volunteer Fire Company

35-Fire Griggstown Volunteer Fire Company

41-Fire Little Rocky Hill Volunteer Fire Company

Fire District Three (north/east)

25-Fire Community Volunteer Fire Company #1

27-Fire East Franklin Fire Company

Fire District Four (south - Kingston)

39-Fire Kingston Volunteer Fire Company #1

The Franklin fire companies moved from VHF to the trunked system on 3/04/08. Paging is done on both fire-high and the new county-wide UHF channel and all subsequent communications with dispatch are on the digital (clear) talkgroups. Districts 1 and 3 each connected their old repeaters to multicast their ops talkgroup, so you don't need a digital scanner to hear stuff on those channels. It isn't known whether this channel is also an uplink to the talkgroup (can you transmit into the trunked system from the VHF channel, or only hear the talkgroup on it?).

Franklin fire companies use a simple identifier scheme. A prefix (the station/ squad number) is given, then a suffix. The suffixes are as follows: A=Chief, B=Assistant Chief, C+=other officers in descending rank. Significant apparatus generally have a single digit number, apparently assigned based on the next available number at the time of purchase. Simpler apparatus are stated as such: Car 41 or Utility 41 or Rescue 41 (41 being the station number).

Franklin (as "Franklin PD") continues to dispatch all squads itself. EMFAS (52) and FSFAS (71) are paged on the VHF channel, Kendall Park and Kingston Squads are alerted on South Brunswick's (Middlesex County) ES paging channel, and county pages Rocky Hill (53) on Fire-High. All five squads, RWJUH-SPUH ALS, RWJUH-SPUH BLS, and SMC ALS all communicate with Franklin on the trunked system. Since Rural-Metro left NJ in 2006, around-the-clock EMS coverage has been supplemented by Ambulance 782 (primary) and others as needed from RWJUH-SPUH EMS (or Rutgers EMS). Its dispatch is by MedCentral though it also contacts Franklin on Franklin's EMS channel.

Animal control and the construction code department joined the system in 2005 and went digital in August 2006. The Health Department joined in August 2006. Public Works began using it in the first quarter of 2006, though it still operates partially on high-band. The Department of Fire Prevention had access to it in the second quarter of 2006, but didn't start using it in earnest until they went digital in August (Township Main Analog is still their F-2).

Below is a table of the identified talkgroups. Old and unidentified talkgroups are now omitted for clarity.

Green Brook Township

Green Brook Township's Police Department is self-dispatched on a VHF-high repeater.

Green Brook Fire-EMS operates on a VHF-high repeater. Tests are performed daily at 1900.

The Green Brook Rescue Squad shares the repeater with the GBFD. Daytime EMS coverage has switched to Somerset Medical Center EMS from the North Plainfield Fire Department; listen for County to dispatch units on JEMS 1 and the trunked system's EMS talkgroups.

See Warren Township for Watchung Hills Regional High School channels.

Hillsborough Township

Hillsborough Township's Police Department is self-dispatched on a repeater by 841.

Hillsborough's fire stations are dispatched on Fire-High by County and, including Station 48 when responding into Hillsborough, operate on a repeater.

EMS is provided by the Hillsborough Rescue Squad (volunteer) and the Hillsborough EMS Corporation (paid). Units are paged on JEMS 1 and dispatched on the police repeater. A VHF-high repeater is used for operations and internal coordination. Somerset ALS units also communicate with 841 on the police channel.

Manville Borough

Manville Borough's Police Department is self-dispatched on a VHF-high repeater.

Manville fire is dispatched by county.

The Manville First Aid Squad is paged and operates on the old police dispatch channel.

The DPW has a channel which may also be used for talk-around channel by all services.

Millstone Borough

Millstone Borough receives police services from the State Police, Troop B, which operates on an 800 MHz Motorola trunked system. Refer to the General Channels page for more information.

Millstone is serviced by the Millstone Valley Fire Company. Look under the Franklin Township section on this page for more info on their communications.

Millstone is serviced by the East Millstone First Aid Squad; look under the Franklin Township section on this page for more info on their communications.

Montgomery Township

Montgomery Township's Police Department ("Mike" units) is dispatched by the county on the PD South talkgroups. It had been self-dispatched on its own talkgroups, that dispatch talkgroup is still available for internal communications.

Somerset County is the primary dispatch agency for the two Montgomery fire districts/ companies. District 1 / Station 45 is paged on the county's UHF channel, Station 46 is paged on Fire-High. All communications with dispatch is conducted on the Fire Region 6 talkgroup; scene operations are generally on Region 6 or Fire Ops-6 but may be moved to one of the county's six tactical channels if coverage or other factors dictate. Other talkgroups may be used for mutual aid, large incidents, or other unusual situations. Mercer County pages Station 46 directly using the old PL, 82.5 Hz, for mutual aid assignments into Princeton and Hopewell. Two-way communications for those calls are generally conducted on Mercer County channels.

Montgomery EMS is now dispatched by the county -- paging is on the county's UHF channel, 2-way dispatch is on the EMS Dispatch 2 talkgroup, and response and scene coordination are generally on the EMS Ops-3 talkgroup.

The DPW has moved to the police department's old ops talkgroup. Montgomery school buses use a VHF-High simplex channel and Somerset Educational Services Commission buses us a digital talkgroup.

North Plainfield Borough

North Plainfield Borough's Police Department is self-dispatched, now on the county's trunked radio system. The talkgroups which NPPD routinely uses (one analog and two digital) are on the left; see the Somerset County Trunked Radio System section for specifics needed to program the system, and see the Somerset County-wide Police section for additional talkgroups which they may use for mutual aid, coordination, etc.

The North Plainfield Fire Department (50-Fire) is dispatched by county on a repeater shared with Watchung. Alerting is on both the dispatch repeater and the county's new channel.

The North Plainfield Rescue Squad is still paged and dispatched by county on the former repeater. Daytime EMS is run by the fire department (Rescue-1 & Rescue-2), and responds into Green Brook.

Peapack-Gladstone Borough

Peapack-Gladstone Borough's Police Department (Ocean units) is dispatched by county and apparently switched from the conventional repeater to the trunked system on Monday 9/18/06.

Peapack-Gladstone's emergency services are dispatched by county on the conventional repeater.

The DPW operates on a conventional repeater.

Raritan Borough

Raritan Borough's Police Department is self-dispatched on a VHF-high repeater.

The Raritan Fire Department paging is on Fire-high and two-way communications are on the county's trunked system. In cases of large incidents, scan other fire/EMS talkgroups and tac channels listed for the county or listen for an indication of where scene operations are being moved to.

Raritan is served by Somerset Medical Center BLS during weekdays/daytime, and the Somerville Rescue Squad on nights and weekends.

Refer to Bridgewater Township for the Bridgewater-Raritan Regional School District channels.

Rocky Hill Borough

Rocky Hill Borough uses the NJSP for law enforcement; the NJSP uses an 800MHz Motorola trunked system, see the General Channels page for more information. Rocky Hill also contracts with South Bound Brook for certain police services at certain times; seemingly mostly traffic enforcement during rush hour, though SBB units have been in RH at other times too. This unit will identify as Rocky and use the county's South Police talkgroups.

The Rocky Hill Fire Department is dispatched for most calls by Somerset County on 154.310/100.0. Mercer County does dispatch Rocky Hill directly for mutual aid into Princeton using the old PL of 82.5. Some fire radios may still transmit the old PL too, which Somerset does monitor.

The Rocky Hill First Aid Squad is dispatched by county on VHF and communicates with dispatch on the trunked system.

Somerville Borough

Somerville Borough's Police Department is self-dispatched on a VHF repeater.

Somerville fire is dispatched on fire-high.

Somerville Rescue Squad is paged and operates on 155.31.

South Bound Brook Borough

South Bound Brook Borough's Police Department (Sierra units) is dispatched by county on the trunked system.

South Bound Brook fire company is dispatched on county Fire-High.

South Bound Brook Rescue Squad, 77-Rescue, is dispatched on JEMS 1 by county. Daytime coverage is provided by SMC's unit 801.

Warren Township

Warren Township's Police Department is self-dispatched on a UHF repeater.

Warren Township fire companies are paged on low-band and/or UHF, and operate primarily on a UHF repeater. The two frequencies may be linked together. Ability on the old low-band channels has probably been maintained for backup and mutual aid purposes.

Similar to the fire companies, the rescue squad uses low-band and a UHF repeater.

Watchung Borough

Watchung Borough's Police Department is self-dispatched on a UHF repeater. In the department's new UHF channel plan, F-3 is believed to be a low-power digital tactical channel, either encrypted or clear, and may be 453.1875 or 458.1875. F-2 and F-4 are confirmed to be talkgroups on the county's system; 12016 is also used and may be F-8. F-14 is believed to be the fire department's repeater.

The Watchung Fire Department is dispatched on a UHF repeater along with North Plainfield.

The Watchung Rescue Squad is paged and dispatched on the VHF repeater. Voice messages usually come over UHF too, but tones do not.

See Warren Township for Watchung Hills Regional High School channels.

Somerset-Area SMRs

This is a list of Specialized Mobile Radio (SMR) systems known of in Somerset County. These are basically radio channels for rent, an alternative to Nextel (and there long before Nextel existed). Unless noted otherwise all use LTR trunking; TGIDs are not yet available.

It is possible that a business you are searching for is using an SMR based outside the limits of Somerset County, and it is possible that some of the SMR sites listed here are part of a larger network for wider coverage. There are too many sites outside Mercer to cover on this page; to learn more about a network, search the FCC database for other licenses under the same provider. There is information similar to this for Mercer and Middlesex Counties on their respective pages.

Special thanks: sp48radio & others.

This page was created Sunday 22 June 1997 and last modified Friday 5 March 2010.

http://www.jim-robbins.com/radio/somerset.html