About SpectrumLookup

SpectrumLookup is an independent search of Federal Communications Commission Universal Licensing System (ULS) records, written for land mobile radio technicians and frequency coordinators. It is a local copy of the public license files, so a call sign, a licensee, a county, or a frequency comes back without waiting on the FCC's own search. SpectrumLookup is operated by Tyron Calta.

Who runs it

Ty Calta, KF4DLA, has worked in land mobile radio for more than 28 years and is a former Motorolan. Questions about the site go to radio@spectrumlookup.com, or through the feedback form.

Where the data comes from

Licenses are loaded from the FCC's public ULS bulk files. A weekly file is the full reload for each license family, and the FCC's daily files are applied after that. The data is current as of Nov 12, 2026. The update runs every day, usually the morning after the FCC publishes the daily file. Machine-readable status is at /status. The date in the footer is the same data-as-of date.

The copy can lag the FCC, and a row can be incomplete or wrong. For a filing, a coordination, or anything else that has to match the official record, check the FCC's own ULS license search.

What's included

These FCC license families are loaded today:

• Amateur – 1,700,495 licenses (HA, HV)
• Private Land Mobile – 861,770 licenses (GB, GE, GF, GI, GJ, GO, GP, GU, IG, IQ, PA, PB, PW, QM, QQ, RS, SG, SL, SP, SY, YB, YE, YF, YG, YI, YJ, YO, YP, YU, YW)
• Commercial Land Mobile – 81,085 licenses (GM, GR, GS, GX, IK, LN, LW, NC, QD, QO, QT, YK, YM, YS, YX)
• 800/900 MHz SMR (Market) – 9,496 licenses (YC, YD, YH)
• Broadcast Auxiliary – 21,575 licenses (LP, LV, RP)
• Paging – 9,604 licenses (CA, CB, CD, CG, CO, CR)
• Coast & Ground – 35,934 licenses (AA, AF, AR, MA, MC, MK, MR)
• Commercial Operator – 794,840 licenses (CM, RR)
• Microwave – 367,823 licenses (AB, AI, AS, CE, CF, CT, MG, MM, MW, NN, PE, PF, TB, TI, TP, TS, TT, WA)
• GMRS – 624,180 licenses (ZA)
• Ship – 403,303 licenses (SA, SB, SE)
• Aircraft – 153,251 licenses (AC)

See covered radio services for the codes in the current file, and the radio service codes reference for every code name in the lookup tables. A short walk-through of the searches is on How to use SpectrumLookup.

How this differs from FCC ULS

The underlying records are the FCC's. The search is not. On this site you can:

• Search by call sign, licensee name, or FRN, by radio service or a service group, by frequency or band, and by state, county, or city, on the transmitter site or the mailing address.
• Search a latitude and longitude with a radius, in miles.
• Run the same three opening searches as the old General Menu: Callsign, Licensee, and Site / Market / Frequency, including a county and a frequency range.
• Run a co-channel or adjacent-channel check and see the matching sites on a map. Distances are straight-line miles, and the check uses active licenses.
• Open a license and read the service code, status, dates, FRN, locations, frequencies (station class, output power, and maximum ERP), emission designators, history, and special conditions. Market-area 800 and 900 MHz SMR licenses (YC, YH, and YD) also show the market code, market name, channel block, and frequency range.
• Download an unofficial Classic or Modern PDF of a license, and follow the link on that page to the official FCC ULS record. The PDF is not an FCC authorization.
• Export a Site / Market / Frequency result as CSV.

Not affiliated with the FCC

SpectrumLookup is unofficial. It is not affiliated with, endorsed by, or operated by the Federal Communications Commission. See the Terms of Use and Privacy Policy.