73 Amateur Radio Lookup
v1.1 · iPhone · FCC ULS · One-time purchase

Find any U.S. ham, in seconds.

73 is a fast, private FCC ULS callsign lookup for iPhone. Search by call or name, filter by license class, status, state, or city, drill into the full FCC record, and share what you find with a QR scan from the operator next to you.

Favorites and history live on your device. No account, no ads, no tracking. Free for 20 days, then a one-time $2.99 — no subscription, ever.

Get it on the App Store → ▸ Watch the demo See it in action How it works

▸ The combined walkthrough — the 73 iPhone app and its webapp sibling at call.n0agi.com, end to end.

What 73 does

Fast FCC ULS lookup. Smart filters. Full FCC record. Zero data harvest.

Fast FCC ULS search
Search any U.S. amateur radio call sign by call or name. Results in seconds, straight from the FCC's Universal Licensing System. Recent searches stay one tap away.
Full FCC record on every card
License class, status, FRN, ULS file number, grant + effective + expiration dates, previous call, previous class, group, region — everything the ULS has, in one tap.
Smart filters
Narrow by class (Technician / General / Advanced / Extra / Novice), status (Active / Expired / Cancelled), state, or city. Find every Extra in Texas, or every active license in your city, in a single query.
QR sharing for the field
Every detail card carries a QR code. Hand off any callsign to the operator next to you with a quick scan — no typing, no spelling out phonetics over the air.
Favorites, fully local
Star any call to keep it close. Multi-select to bulk add or remove. Filter your favorites. All on your device — no account, no sync, no cloud round-trip.
DMR IDs built in
Every detail card surfaces the operator's DMR IDs alongside the FCC record, sourced from RadioID.net. Digital-mode operators don't need a second app.
Stats dashboard
See who you've looked up at a glance — total lookups, percent active, top state, top license class, plus charts that break down your activity by class and region.
10 hand-crafted themes
Five dark, five light — Midnight, Solar, Matrix, Neon, Gaming, Ocean, Forest, Sandstone, and more. Each theme ships with a matching app icon variant.
Privacy by design
No account. No ads. No analytics. No tracking. Favorites and search history stay on the device. License lookups go to the FCC, never to us.

See it in action

A look at v1.1 — your callsign workbench in the dark theme.

73 About panel showing v1.1 (build 05262026.1) and the FCC ULS data source pill linking to call.n0agi.com
Aboutv1.1 — pulls live from the FCC Universal Licensing System. Sister webapp at call.n0agi.com.
73 Search screen with a callsign-or-name field, Search button, and a row of recent searches as orange chips
SearchCallsign or name. Recent searches stay a tap away.
73 detail card for N0AGI showing license class Extra, status Active, full FCC record fields, QR code, and DMR ID list
Detail cardFull FCC record, QR code, and DMR IDs — one screen. Street address kept private; city + state only.
73 Favorites screen showing two saved callsigns, W1AW ARRL HQ and W5PC Amateur Radio Club of Parker County, each with an Active status pill
FavoritesStar any call to keep it close. Multi-select, filter, all local.
73 Stats dashboard showing 25 lookups, 72 percent active, top state Texas, top class Extra, plus bar charts for license-class breakdown and top states
StatsLookup history broken down by class, state, and activity. Insight into your own ham-watching.
73 Theme picker showing 10 hand-crafted themes with Dark and Light variants, including Midnight, Solar, Matrix, Neon, Gaming, Ocean, Forest, and Sandstone, each with a matching app icon
10 themesMidnight, Solar, Matrix, Neon, Gaming, Ocean, Forest, Sandstone — each ships with a matching app icon.

How it works

Three taps from blank screen to full FCC record.

1
Search
Type a callsign or name. 73 hits the FCC ULS directly and returns the matching licenses in seconds. Apply class, status, state, or city filters to narrow the field.
2
Drill in
Tap any result for the full FCC record — license class, status, FRN, ULS file number, grant + expiration dates, previous call, group, region, plus DMR IDs via RadioID.net. Generate a QR code to hand the callsign to the operator next to you.
3
Save what matters
Star calls for later. Filter your favorites. Pull stats on who you've looked up by class, state, or status. Everything stays on your device — no account, no cloud sync.

Frequently asked questions

If something isn't covered here, just email — we read everything.

What does "73" mean?
"73" is ham radio shorthand for "best regards" — the standard sign-off between operators, going back to the early days of Morse code on the telegraph. It's how hams say goodbye, on the air or off. The app is named after the gesture.
Where does the data come from?
The FCC Universal Licensing System (ULS) is the source of truth for license records — class, status, dates, FRN, file number, all of it. DMR IDs come from RadioID.net. Both are public databases. 73 talks to them directly on each lookup.
Why is the street address hidden?
The FCC ULS does publish licensee street addresses, but exposing every operator's home address in a casual lookup app felt wrong. 73 shows city and state only. If you need the full address (for QSL card mailing or a contest log), the FCC's own ULS website still has it.
Is there a free trial?
Yes — 20 days of the full app, no restrictions, no credit card to start. After the trial, an in-app purchase unlocks the app permanently on your Apple ID.
How much does it cost after the trial?
$2.99, one-time. No subscription, ever. The unlock follows your Apple ID — install on a new iPhone, sign in, and 73 unlocks itself.
Do you collect any data on me?
No. No account, no ads, no analytics, no telemetry. Favorites and search history stay on the device. License lookups go directly to the FCC ULS and RadioID.net — never to a server we operate.
Does it work offline?
Favorites and search history are fully offline. New lookups need an internet connection — they hit the live FCC ULS and RadioID.net databases for fresh data. If you're in the field with no signal, saved favorites and recent searches are still readable.
What iPhones are supported?
iPhone running iOS 17 or later. Tested on iPhone X through the 16 series. Older devices on iOS 17 work too — performance is bound mostly by your network speed to the FCC ULS, not the phone.
Is there an iPad version?
73 runs on iPad in iPhone-compatibility mode today. A native iPad layout that takes advantage of the larger screen is on the roadmap.
Apple Watch?
Not yet. It's on the wishlist — a quick-glance callsign lookup on the wrist would be useful at field day. If you'd find it valuable, drop a note in the support email; it helps us prioritize.
QRZ integration?
QRZ has its own API and licensing terms; we're looking at it for a future release. For now, every detail card in 73 has the data fields a QRZ lookup would give you, sourced directly from the FCC ULS.
ADIF export?
Planned. ADIF (Amateur Data Interchange Format) export of your favorites and lookup history would let you flow data into your logging app of choice. Tracked as a roadmap item.
Is there an Android version?
Not in 2026. If response to the iOS launch shows real Android demand, we'll revisit. For now, 73 is iOS-only.
Is there a webapp?
Yes — call.n0agi.com is the sister web experience. Same FCC ULS data layer, same lookup speed, runs in any browser. 73 is the native iPhone surface; the webapp is the browser surface.
Is 73 open source?
Not at this time. 73 is closed-source commercial software. The FCC ULS itself is a public dataset; you can build your own callsign-lookup tool against it any time.

Need help? Found a bug? Have a feature request?

73 is built by an indie shop. Every email is read by a human (Nagi, N0AGI). Typical response: same day.