Apparatus

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sensors Mode-S transponder

A2454F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N24526 · operated by UNITED AIRLINES INC

Hex
A2454F
Octal
50442517
Decimal
10,634,575
Country
US
Tail
N24526
Type
A21N
No current signal · last broadcast 2h ago
Flights observed
392
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A2454F.

Country allocation

The ICAO 24-bit address A2454F 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
UAL2666 United Airlines 7 2026-07-06
UAL2487 United Airlines 7 2026-05-09
UAL1946 United Airlines 6 2026-07-02
UAL1023 - 6 2026-06-29
UAL675 - 5 2026-06-22
UAL651 United Airlines 5 2026-05-09
UAL617 United Airlines 5 2026-06-09
UAL576 - 5 2026-07-02
UAL534 - 5 2026-06-18
UAL329 - 5 2026-06-28
UAL2843 - 5 2026-06-29
UAL2099 United Airlines 5 2026-05-11
UAL1954 - 5 2026-07-06
UAL2605 United Airlines 4 2026-06-04
UAL2426 - 4 2026-06-24
UAL2088 United Airlines 4 2026-05-13
UAL2000 - 4 2026-06-13
UAL1323 United Airlines 4 2026-06-25
UAL1209 United Airlines 4 2026-06-11
UAL1013 United Airlines 4 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL1792 - Jul 14, 01:15 UTCJul 14, 04:20 UTC3h 5m
2026-07-13 UAL1505 DEN → EWR Jul 13, 20:05 UTCJul 13, 23:25 UTC3h 20m
2026-07-13 UAL2806 ORD → DEN Jul 13, 11:05 UTCJul 13, 12:55 UTC1h 50m
2026-07-13 UAL2649 DEN → ORD Jul 13, 03:40 UTCJul 13, 05:31 UTC1h 50m
2026-07-12 UAL1770 MCO → DEN Jul 12, 22:05 UTCJul 13, 01:25 UTC3h 20m
2026-07-12 UAL2354 DEN → MCO Jul 12, 16:45 UTCJul 12, 19:50 UTC3h 5m
2026-07-12 UAL337 - Jul 12, 13:15 UTCJul 12, 14:40 UTC1h 25m
2026-07-11 UAL2053 ORD → PHX Jul 11, 21:30 UTCJul 12, 00:30 UTC3h 0m
2026-07-11 UAL2475 - Jul 11, 19:20 UTCJul 11, 19:25 UTC5m
2026-07-11 UAL2475 MCO → ORD Jul 11, 16:45 UTCJul 11, 19:25 UTC2h 40m
2026-07-11 UAL2475 MCO → ORD Jul 11, 16:44 UTCJul 11, 19:05 UTC2h 21m
2026-07-11 UAL2280 LAX → BOS Jul 11, 12:50 UTCJul 11, 15:15 UTC2h 25m
2026-07-11 UAL368 SFO → ORD Jul 11, 07:25 UTCJul 11, 11:00 UTC3h 35m
2026-07-11 UAL2179 - Jul 11, 00:20 UTCJul 11, 04:20 UTC4h 0m
2026-07-10 UAL2113 - Jul 10, 21:30 UTCJul 10, 21:45 UTC15m
2026-07-10 UAL2113 LAX → ORD Jul 10, 18:05 UTCJul 10, 21:45 UTC3h 41m
2026-07-10 UAL2113 LAX → ORD Jul 10, 18:04 UTCJul 10, 21:14 UTC3h 10m
2026-07-10 UAL2361 - Jul 10, 12:20 UTCJul 10, 16:05 UTC3h 45m
2026-07-10 UAL212 - Jul 10, 00:20 UTCJul 10, 04:50 UTC4h 30m
2026-07-09 UAL1363 - Jul 9, 18:30 UTCJul 9, 22:20 UTC3h 50m
2026-07-09 UAL2683 MCO → ORD Jul 9, 13:45 UTCJul 9, 16:05 UTC2h 20m
2026-07-09 UAL259 DEN → MCO Jul 9, 00:40 UTCJul 9, 03:55 UTC3h 15m
2026-07-07 UAL8166 - Jul 7, 04:50 UTCJul 7, 06:50 UTC2h 0m
2026-07-06 UAL1954 - Jul 6, 23:40 UTCJul 7, 01:50 UTC2h 10m
2026-07-06 UAL1583 LAS → ORD Jul 6, 17:35 UTCJul 6, 20:40 UTC3h 5m
2026-07-06 UAL2316 DEN → LAS Jul 6, 14:30 UTCJul 6, 15:50 UTC1h 20m
2026-07-06 UAL2666 ORD → DEN Jul 6, 10:25 UTCJul 6, 12:25 UTC2h 0m
2026-07-05 UAL2320 LAS → ORD Jul 5, 23:25 UTCJul 6, 02:35 UTC3h 10m
2026-07-05 UAL777 ORD → LAS Jul 5, 17:55 UTCJul 5, 21:05 UTC3h 10m
2026-07-05 UAL2315 DEN → ORD Jul 5, 14:05 UTCJul 5, 16:00 UTC1h 55m
2026-07-05 UAL8144 SFO → DEN Jul 5, 01:19 UTCJul 5, 03:17 UTC1h 58m
2026-07-05 UAL8144 SFO → DEN Jul 5, 01:20 UTCJul 5, 03:20 UTC2h 0m
2026-07-04 UAL1812 DEN → SFO Jul 4, 19:45 UTCJul 4, 21:50 UTC2h 5m
2026-07-04 UAL1409 - Jul 4, 15:50 UTCJul 4, 17:45 UTC1h 55m
2026-07-04 UAL1799 MIA → EWR Jul 4, 12:00 UTCJul 4, 14:05 UTC2h 5m
2026-07-04 UAL353J LAX → ORD Jul 4, 06:10 UTCJul 4, 09:50 UTC3h 40m
2026-07-04 UAL1262 - Jul 4, 02:45 UTCJul 4, 04:45 UTC2h 0m
2026-07-04 UAL1262 DEN → LAX Jul 4, 02:40 UTCJul 4, 04:36 UTC1h 56m
2026-07-03 UAL2845 MCO → DEN Jul 3, 20:00 UTCJul 3, 23:15 UTC3h 15m
2026-07-03 UAL2845 MCO → DEN Jul 3, 19:55 UTCJul 3, 23:06 UTC3h 11m
2026-07-03 UAL2292 EWR → DEN Jul 3, 14:40 UTCJul 3, 17:55 UTC3h 15m
2026-07-03 UAL2829 - Jul 3, 02:55 UTCJul 3, 04:45 UTC1h 50m
2026-07-02 UAL576 - Jul 2, 21:30 UTCJul 3, 01:10 UTC3h 40m
2026-07-02 UAL1946 ORD → LGA Jul 2, 15:30 UTCJul 2, 19:15 UTC3h 45m
2026-07-02 UAL661 ORD → EWR Jul 2, 03:55 UTCJul 2, 07:45 UTC3h 50m
2026-07-01 UAL2135 - Jul 1, 22:40 UTCJul 2, 00:45 UTC2h 5m
2026-07-01 UAL2135 IAH → ORD Jul 1, 22:30 UTCJul 2, 00:30 UTC2h 0m
2026-07-01 UAL1599 DEN → IAH Jul 1, 19:09 UTCJul 1, 20:59 UTC1h 50m
2026-07-01 UAL1599 - Jul 1, 19:05 UTCJul 1, 19:45 UTC40m
2026-07-01 UAL2455 EWR → DEN Jul 1, 14:15 UTCJul 1, 17:45 UTC3h 30m

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 N24526 page for operator, model, and routing details .

Mode-S A2454F frequently asked

What is Mode-S code A2454F?
A2454F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N24526.
Where is Mode-S A2454F registered?
Mode-S code A2454F 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 A2454F broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2454F, octal 50442517, decimal 10,634,575.
What flights does A2454F operate?
Mode-S A2454F has broadcast 20 distinct callsigns, including UAL2666, UAL2487, UAL1946, UAL1023, UAL675.