Apparatus

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sensors Mode-S transponder

A254D7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N24973 · BOEING 787-9 Dreamliner · operated by UNITED AIRLINES INC

Hex
A254D7
Octal
50452327
Decimal
10,638,551
Country
US
Tail
N24973
Type
B789
Broadcasting now · callsign UAL760 · 39,000 ft
Flights observed
191
Distinct callsigns
20
Country
US
Last broadcast
6h ago

Current position

A254D7 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A254D7 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
UAL62 - 10 2026-06-27
UAL198 United Airlines 9 2026-06-04
UAL806 - 7 2026-06-19
UAL805 - 7 2026-06-18
UAL7 - 7 2026-06-28
UAL63 - 7 2026-06-28
UAL6 - 7 2026-06-26
UAL61 United Airlines 6 2026-06-09
UAL33 United Airlines 6 2026-06-01
UAL28 United Airlines 6 2026-06-10
UAL1757 - 6 2026-06-17
UAL32 - 5 2026-06-25
UAL1849 United Airlines 5 2026-06-17
UAL893 United Airlines 4 2026-05-08
UAL892 United Airlines 4 2026-05-09
UAL83 United Airlines 4 2026-06-23
UAL820 United Airlines 4 2026-05-27
UAL60 United Airlines 4 2026-06-08
UAL29 United Airlines 4 2026-06-09
UAL263 - 4 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL760 - Jul 14, 02:50 UTCJul 14, 04:40 UTC1h 50m
2026-07-13 UAL263 - Jul 13, 14:20 UTCJul 13, 23:05 UTC8h 45m
2026-07-13 UAL262 DEN → LHR Jul 13, 03:20 UTCJul 13, 11:45 UTC8h 25m
2026-07-13 UAL177 DEN → FCO Jul 13, 00:08 UTCJul 13, 10:00 UTC9h 52m
2026-07-11 UAL26 LHR → DEN Jul 11, 10:55 UTCJul 11, 20:00 UTC9h 5m
2026-07-11 UAL26 LHR → DEN Jul 11, 10:50 UTCJul 11, 19:53 UTC9h 3m
2026-07-11 UAL27 DEN → LHR Jul 11, 00:20 UTCJul 11, 08:45 UTC8h 25m
2026-07-10 UAL181 - Jul 10, 10:00 UTCJul 10, 19:30 UTC9h 30m
2026-07-09 UAL182 DEN → FRA Jul 9, 22:30 UTCJul 10, 07:35 UTC9h 5m
2026-07-09 UAL142 - Jul 9, 07:55 UTCJul 9, 18:00 UTC10h 5m
2026-07-09 UAL142 NRT → DEN Jul 9, 07:55 UTCJul 9, 18:00 UTC10h 5m
2026-07-08 UAL143 DEN → NRT Jul 8, 18:04 UTCJul 9, 05:28 UTC11h 24m
2026-07-08 UAL143 DEN → NRT Jul 8, 18:05 UTCJul 9, 05:30 UTC11h 25m
2026-07-07 UAL761 MUC → DEN Jul 7, 14:35 UTCJul 8, 01:15 UTC10h 40m
2026-07-07 UAL760 - Jul 7, 02:45 UTCJul 7, 12:05 UTC9h 20m
2026-07-06 UAL263 - Jul 6, 14:45 UTCJul 6, 23:45 UTC9h 0m
2026-07-06 UAL262 DEN → LHR Jul 6, 03:00 UTCJul 6, 11:30 UTC8h 30m
2026-07-05 UAL761 MUC → DEN Jul 5, 14:40 UTCJul 6, 00:40 UTC10h 0m
2026-07-05 UAL760 - Jul 5, 02:35 UTCJul 5, 11:50 UTC9h 15m
2026-07-04 UAL263 - Jul 4, 14:10 UTCJul 4, 23:20 UTC9h 10m
2026-07-04 UAL263 LHR → DEN Jul 4, 14:14 UTCJul 4, 23:17 UTC9h 3m
2026-07-04 UAL262 DEN → LHR Jul 4, 02:40 UTCJul 4, 11:05 UTC8h 25m
2026-07-03 UAL178 KIX → GUM Jul 3, 12:50 UTCJul 4, 00:05 UTC11h 15m
2026-07-03 UAL177 - Jul 3, 00:00 UTCJul 3, 09:20 UTC9h 20m
2026-07-02 UAL26 - Jul 2, 10:50 UTCJul 2, 20:05 UTC9h 15m
2026-07-02 UAL27 DEN → LHR Jul 2, 00:20 UTCJul 2, 08:45 UTC8h 25m
2026-07-01 UAL26 - Jul 1, 10:50 UTCJul 1, 19:50 UTC9h 0m
2026-07-01 UAL27 DEN → LHR Jul 1, 00:10 UTCJul 1, 08:40 UTC8h 30m
2026-06-30 UAL181 FRA → DEN Jun 30, 09:55 UTCJun 30, 19:25 UTC9h 30m
2026-06-29 UAL182 DEN → FRA Jun 29, 22:15 UTCJun 30, 07:00 UTC8h 45m
2026-06-29 UAL142 NRT → DEN Jun 29, 08:04 UTCJun 29, 17:40 UTC9h 35m
2026-06-28 UAL7 - Jun 28, 16:09 UTCJun 29, 04:55 UTC12h 45m
2026-06-28 UAL63 - Jun 28, 01:10 UTCJun 28, 10:19 UTC9h 10m
2026-06-28 UAL63 GRU → IAH Jun 28, 01:11 UTCJun 28, 10:21 UTC9h 10m
2026-06-27 UAL62 - Jun 27, 00:14 UTCJun 27, 01:44 UTC1h 30m
2026-06-27 UAL62 IAH → GRU Jun 27, 00:13 UTCJun 27, 09:00 UTC8h 47m
2026-06-26 UAL6 - Jun 26, 09:05 UTCJun 26, 20:10 UTC11h 5m
2026-06-25 UAL32 - Jun 25, 18:10 UTCJun 26, 04:59 UTC10h 50m
2026-06-24 UAL2403 - Jun 24, 16:24 UTCJun 24, 21:29 UTC5h 5m
2026-06-24 UAL2403 EWR → LAX Jun 24, 16:27 UTCJun 24, 21:23 UTC4h 56m
2026-06-23 UAL83 DEL → EWR Jun 23, 19:00 UTCJun 24, 10:49 UTC15h 50m
2026-06-23 UAL83 DEL → EWR Jun 23, 19:01 UTCJun 24, 10:45 UTC15h 44m
2026-06-23 UAL82 - Jun 23, 03:00 UTCJun 23, 16:39 UTC13h 40m
2026-06-21 UAL2480 - Jun 21, 21:29 UTCJun 22, 02:00 UTC4h 30m
2026-06-21 UAL1593 - Jun 21, 14:24 UTCJun 21, 19:34 UTC5h 10m
2026-06-20 UAL83 DEL → EWR Jun 20, 19:40 UTCJun 21, 11:24 UTC15h 45m
2026-06-20 UAL82 - Jun 20, 01:39 UTCJun 20, 12:04 UTC10h 25m
2026-06-19 UAL713 SFO → EWR Jun 19, 17:49 UTCJun 19, 22:09 UTC4h 20m
2026-06-19 UAL806 - Jun 19, 02:45 UTCJun 19, 13:29 UTC10h 45m
2026-06-18 UAL805 SFO → ICN Jun 18, 07:40 UTCJun 18, 18:45 UTC11h 5m

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 N24973 page for operator, model, and routing details .

Mode-S A254D7 frequently asked

What is Mode-S code A254D7?
A254D7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N24973.
Where is Mode-S A254D7 registered?
Mode-S code A254D7 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 A254D7 broadcasting right now?
Yes. Mode-S A254D7 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A254D7, octal 50452327, decimal 10,638,551.
What flights does A254D7 operate?
Mode-S A254D7 has broadcast 20 distinct callsigns, including UAL62, UAL198, UAL806, UAL805, UAL7.