Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A2452A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N24514 · operated by UNITED AIRLINES INC

Hex
A2452A
Octal
50442452
Decimal
10,634,538
Country
US
Tail
N24514
Type
A21N
No current signal · last broadcast 9h ago
Flights observed
378
Distinct callsigns
20
Country
US
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S A2452A.

Country allocation

The ICAO 24-bit address A2452A 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
UAL526 United Airlines 6 2026-06-08
UAL360 United Airlines 6 2026-05-28
UAL706 United Airlines 5 2026-05-22
UAL617 - 5 2026-06-26
UAL495 - 5 2026-07-03
UAL2197 - 5 2026-07-17
UAL405 United Airlines 4 2026-05-28
UAL347 United Airlines 4 2026-06-12
UAL2865 - 4 2026-06-30
UAL2061 - 4 2026-07-02
UAL1954 - 4 2026-06-24
UAL1565 - 4 2026-06-23
UAL1482 United Airlines 4 2026-04-18
UAL1097 United Airlines 4 2026-04-17
UAL746 - 3 2026-07-12
UAL660 - 3 2026-06-23
UAL587 United Airlines 3 2026-07-01
UAL475 - 3 2026-07-07
UAL414 United Airlines 3 2026-04-16
UAL295 United Airlines 3 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 UAL511 IAH → SFO Jul 17, 23:05 UTCJul 18, 02:50 UTC3h 46m
2026-07-17 UAL1755 - Jul 17, 16:49 UTCJul 17, 19:49 UTC3h 0m
2026-07-17 UAL1421 ORD → FLL Jul 17, 12:25 UTCJul 17, 15:10 UTC2h 45m
2026-07-17 UAL2197 - Jul 17, 02:20 UTCJul 17, 02:30 UTC10m
2026-07-17 UAL2197 - Jul 17, 00:20 UTCJul 17, 02:30 UTC2h 10m
2026-07-17 UAL2197 IAH → ORD Jul 17, 00:11 UTCJul 17, 02:02 UTC1h 51m
2026-07-16 UAL2451 - Jul 16, 20:15 UTCJul 16, 22:25 UTC2h 10m
2026-07-16 UAL2466 MCO → ORD Jul 16, 15:05 UTCJul 16, 17:35 UTC2h 30m
2026-07-16 UAL284 - Jul 16, 11:15 UTCJul 16, 13:30 UTC2h 15m
2026-07-16 UAL3885 - Jul 16, 05:15 UTCJul 16, 07:30 UTC2h 15m
2026-07-13 UAL3877 DEN → MLB Jul 13, 01:10 UTCJul 13, 04:15 UTC3h 5m
2026-07-12 UAL746 DCA → DEN Jul 12, 20:25 UTCJul 12, 23:30 UTC3h 5m
2026-07-12 UAL789 DEN → DCA Jul 12, 15:45 UTCJul 12, 18:50 UTC3h 5m
2026-07-12 UAL2643 - Jul 12, 11:35 UTCJul 12, 13:35 UTC2h 0m
2026-07-12 UAL2643 IAH → DEN Jul 12, 11:46 UTCJul 12, 13:31 UTC1h 45m
2026-07-12 UAL2813 - Jul 12, 01:55 UTCJul 12, 03:55 UTC2h 0m
2026-07-11 UAL2497 IAD → ORD Jul 11, 22:30 UTCJul 12, 00:05 UTC1h 35m
2026-07-11 UAL2794 ORD → IAD Jul 11, 18:59 UTCJul 11, 20:13 UTC1h 14m
2026-07-11 UAL2794 ORD → IAD Jul 11, 18:50 UTCJul 11, 20:15 UTC1h 25m
2026-07-11 UAL1525 EWR → ORD Jul 11, 14:40 UTCJul 11, 16:55 UTC2h 15m
2026-07-11 UAL2295 - Jul 11, 11:40 UTCJul 11, 13:10 UTC1h 30m
2026-07-11 UAL353T - Jul 11, 06:35 UTCJul 11, 10:05 UTC3h 30m
2026-07-11 UAL1262 - Jul 11, 03:01 UTCJul 11, 04:50 UTC1h 50m
2026-07-10 UAL1770 MCO → DEN Jul 10, 21:25 UTCJul 11, 01:15 UTC3h 50m
2026-07-10 UAL2354 DEN → MCO Jul 10, 16:45 UTCJul 10, 19:50 UTC3h 5m
2026-07-10 UAL1217 ORD → DEN Jul 10, 12:38 UTCJul 10, 14:26 UTC1h 48m
2026-07-10 UAL1217 - Jul 10, 12:25 UTCJul 10, 14:30 UTC2h 5m
2026-07-10 UAL2197 IAH → ORD Jul 10, 00:10 UTCJul 10, 02:55 UTC2h 45m
2026-07-09 UAL2451 - Jul 9, 20:10 UTCJul 9, 22:15 UTC2h 5m
2026-07-09 UAL2466 MCO → ORD Jul 9, 14:55 UTCJul 9, 17:10 UTC2h 15m
2026-07-09 UAL284 - Jul 9, 11:15 UTCJul 9, 13:20 UTC2h 5m
2026-07-08 UAL2258 DEN → ORD Jul 8, 02:00 UTCJul 8, 03:55 UTC1h 55m
2026-07-07 UAL1729 - Jul 7, 20:05 UTCJul 8, 00:20 UTC4h 15m
2026-07-07 UAL1442 IAH → EWR Jul 7, 14:20 UTCJul 7, 17:40 UTC3h 20m
2026-07-07 UAL1874 - Jul 7, 10:45 UTCJul 7, 12:40 UTC1h 55m
2026-07-07 UAL475 - Jul 7, 06:25 UTCJul 7, 08:10 UTC1h 45m
2026-07-06 UAL1354 RSW → DEN Jul 6, 20:05 UTCJul 7, 00:05 UTC4h 0m
2026-07-06 UAL1102 ORD → RSW Jul 6, 16:00 UTCJul 6, 18:25 UTC2h 25m
2026-07-06 UAL2631 BOS → ORD Jul 6, 11:25 UTCJul 6, 13:45 UTC2h 20m
2026-07-05 UAL597 DEN → BOS Jul 5, 20:25 UTCJul 6, 00:00 UTC3h 35m
2026-07-05 UAL581 - Jul 5, 16:40 UTCJul 5, 18:40 UTC2h 0m
2026-07-05 UAL1998 - Jul 5, 04:00 UTCJul 5, 05:50 UTC1h 50m
2026-07-04 UAL2329 RNO → SFO Jul 4, 20:25 UTCJul 4, 22:00 UTC1h 35m
2026-07-04 UAL2466 MCO → ORD Jul 4, 15:05 UTCJul 4, 17:20 UTC2h 15m
2026-07-04 UAL284 ORD → MCO Jul 4, 11:35 UTCJul 4, 13:40 UTC2h 5m
2026-07-04 UAL2258 DEN → ORD Jul 4, 06:21 UTCJul 4, 08:03 UTC1h 42m
2026-07-04 UAL2258 DEN → ORD Jul 4, 06:20 UTCJul 4, 08:15 UTC1h 55m
2026-07-03 UAL2297 BOS → DEN Jul 3, 19:40 UTCJul 3, 23:40 UTC4h 0m
2026-07-03 UAL558 DEN → BOS Jul 3, 14:05 UTCJul 3, 17:40 UTC3h 35m
2026-07-03 UAL558 DEN → BOS Jul 3, 14:03 UTCJul 3, 17:38 UTC3h 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 N24514 page for operator, model, and routing details .

Mode-S A2452A frequently asked

What is Mode-S code A2452A?
A2452A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N24514.
Where is Mode-S A2452A registered?
Mode-S code A2452A 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 A2452A broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2452A, octal 50442452, decimal 10,634,538.
What flights does A2452A operate?
Mode-S A2452A has broadcast 20 distinct callsigns, including UAL526, UAL360, UAL706, UAL617, UAL495.