Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A254F7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N24980 · BOEING 787-9 Dreamliner · operated by UNITED AIRLINES INC

Hex
A254F7
Octal
50452367
Decimal
10,638,583
Country
US
Tail
N24980
Type
B789
No current signal · last broadcast 1d ago
Flights observed
155
Distinct callsigns
20
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A254F7.

Country allocation

The ICAO 24-bit address A254F7 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
UAL181 - 10 2026-07-03
UAL761 - 9 2026-07-10
UAL27 - 9 2026-07-04
UAL32 - 8 2026-06-28
UAL263 - 8 2026-07-08
UAL26 - 8 2026-07-04
UAL182 United Airlines 8 2026-07-02
UAL178 United Airlines 7 2026-07-05
UAL143 - 7 2026-07-10
UAL142 United Airlines 7 2026-07-02
UAL262 - 6 2026-07-08
UAL760 - 5 2026-07-09
UAL198 - 5 2026-06-26
UAL177 - 5 2026-07-05
UAL33 - 4 2026-07-11
UAL199 United Airlines 4 2026-06-27
UAL99 United Airlines 3 2026-04-17
UAL98 United Airlines 3 2026-04-16
UAL821 United Airlines 3 2026-06-02
UAL820 United Airlines 3 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 UAL935 LHR → LAX Jul 12, 12:30 UTCJul 12, 22:51 UTC10h 21m
2026-07-12 UAL935 - Jul 12, 12:30 UTCJul 12, 22:55 UTC10h 25m
2026-07-11 UAL923 - Jul 11, 22:55 UTCJul 12, 07:45 UTC8h 50m
2026-07-11 UAL923 LAX → LHR Jul 11, 22:53 UTCJul 12, 08:33 UTC9h 40m
2026-07-11 UAL33 - Jul 11, 08:10 UTCJul 11, 17:55 UTC9h 45m
2026-07-10 UAL143 DEN → NRT Jul 10, 18:04 UTCJul 11, 05:22 UTC11h 18m
2026-07-10 UAL143 - Jul 10, 18:05 UTCJul 10, 20:40 UTC2h 35m
2026-07-10 UAL761 - Jul 10, 00:35 UTCJul 10, 00:50 UTC15m
2026-07-09 UAL761 - Jul 9, 14:30 UTCJul 9, 15:45 UTC1h 15m
2026-07-09 UAL761 MUC → DEN Jul 9, 14:31 UTCJul 10, 00:18 UTC9h 47m
2026-07-09 UAL760 - Jul 9, 03:45 UTCJul 9, 12:50 UTC9h 5m
2026-07-08 UAL263 - Jul 8, 14:05 UTCJul 8, 23:35 UTC9h 30m
2026-07-08 UAL263 LHR → DEN Jul 8, 14:14 UTCJul 8, 23:30 UTC9h 16m
2026-07-08 UAL262 DEN → LHR Jul 8, 03:00 UTCJul 8, 11:20 UTC8h 20m
2026-07-07 UAL263 - Jul 7, 23:40 UTCJul 7, 23:50 UTC10m
2026-07-07 UAL263 - Jul 7, 14:05 UTCJul 7, 23:45 UTC9h 40m
2026-07-07 UAL263 LHR → DEN Jul 7, 14:09 UTCJul 7, 23:21 UTC9h 12m
2026-07-07 UAL262 DEN → LHR Jul 7, 02:57 UTCJul 7, 11:21 UTC8h 24m
2026-07-07 UAL262 DEN → LHR Jul 7, 02:55 UTCJul 7, 11:25 UTC8h 30m
2026-07-06 UAL761 MUC → DEN Jul 6, 14:30 UTCJul 6, 15:45 UTC1h 15m
2026-07-06 UAL761 MUC → DEN Jul 6, 14:31 UTCJul 7, 00:41 UTC10h 10m
2026-07-06 UAL760 - Jul 6, 02:40 UTCJul 6, 11:45 UTC9h 5m
2026-07-05 UAL178 KIX → GUM Jul 5, 12:45 UTCJul 5, 23:25 UTC10h 40m
2026-07-05 UAL177 - Jul 5, 00:00 UTCJul 5, 09:55 UTC9h 55m
2026-07-04 UAL26 - Jul 4, 10:50 UTCJul 4, 19:55 UTC9h 5m
2026-07-04 UAL27 DEN → LHR Jul 4, 00:10 UTCJul 4, 08:25 UTC8h 15m
2026-07-03 UAL181 FRA → DEN Jul 3, 10:10 UTCJul 3, 20:05 UTC9h 55m
2026-07-02 UAL182 DEN → FRA Jul 2, 22:30 UTCJul 3, 07:00 UTC8h 30m
2026-07-02 UAL142 NRT → DEN Jul 2, 07:50 UTCJul 2, 17:20 UTC9h 30m
2026-07-01 UAL7 - Jul 1, 16:45 UTCJul 2, 05:05 UTC12h 20m
2026-07-01 UAL63 - Jul 1, 01:10 UTCJul 1, 10:20 UTC9h 10m
2026-06-30 UAL62 - Jun 30, 00:14 UTCJun 30, 09:15 UTC9h 1m
2026-06-30 UAL62 IAH → GRU Jun 30, 00:03 UTCJun 30, 09:14 UTC9h 11m
2026-06-29 UAL6 - Jun 29, 08:14 UTCJun 29, 19:35 UTC11h 20m
2026-06-28 UAL32 - Jun 28, 18:25 UTCJun 29, 05:24 UTC11h 0m
2026-06-28 UAL32 LAX → NRT Jun 28, 18:15 UTCJun 29, 05:23 UTC11h 8m
2026-06-27 UAL199 PVG → LAX Jun 27, 22:40 UTCJun 27, 23:50 UTC1h 10m
2026-06-26 UAL198 - Jun 26, 20:40 UTCJun 26, 21:39 UTC1h 0m
2026-06-26 UAL33 - Jun 26, 08:24 UTCJun 26, 17:25 UTC9h 0m
2026-06-26 UAL33 NRT → LAX Jun 26, 08:15 UTCJun 26, 17:15 UTC9h 0m
2026-06-25 UAL143 DEN → NRT Jun 25, 18:41 UTCJun 26, 05:48 UTC11h 7m
2026-06-25 UAL143 DEN → NRT Jun 25, 18:34 UTCJun 25, 23:44 UTC5h 10m
2026-06-24 UAL761 MUC → DEN Jun 24, 14:29 UTCJun 25, 00:44 UTC10h 15m
2026-06-24 UAL760 DEN → MUC Jun 24, 02:45 UTCJun 24, 12:04 UTC9h 20m
2026-06-23 UAL178 KIX → GUM Jun 23, 12:55 UTCJun 23, 23:44 UTC10h 50m
2026-06-23 UAL178 KIX → GUM Jun 23, 12:47 UTCJun 23, 23:40 UTC10h 53m
2026-06-23 UAL177 - Jun 23, 00:04 UTCJun 23, 01:45 UTC1h 40m
2026-06-23 UAL177 DEN → FCO Jun 23, 00:08 UTCJun 23, 09:52 UTC9h 44m
2026-06-22 UAL26 - Jun 22, 11:00 UTCJun 22, 20:00 UTC9h 0m
2026-06-21 UAL27 DEN → LHR Jun 21, 23:50 UTCJun 22, 08:25 UTC8h 35m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N24980 page for operator, model, and routing details .

Mode-S A254F7 frequently asked

What is Mode-S code A254F7?
A254F7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N24980.
Where is Mode-S A254F7 registered?
Mode-S code A254F7 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A254F7 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A254F7, octal 50452367, decimal 10,638,583.
What flights does A254F7 operate?
Mode-S A254F7 has broadcast 20 distinct callsigns, including UAL181, UAL761, UAL27, UAL32, UAL263.