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 Jul 26, 20:55 UTC
Flights observed
445
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:55 UTC

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
UAL576 United Airlines 8 2026-07-23
UAL1946 United Airlines 8 2026-07-23
UAL2666 United Airlines 7 2026-07-06
UAL2487 United Airlines 7 2026-05-09
UAL1954 - 6 2026-07-18
UAL1023 - 6 2026-06-29
UAL675 - 5 2026-06-22
UAL651 United Airlines 5 2026-05-09
UAL617 United Airlines 5 2026-06-09
UAL534 - 5 2026-06-18
UAL329 - 5 2026-06-28
UAL2843 - 5 2026-06-29
UAL2829 United Airlines 5 2026-07-24
UAL2099 United Airlines 5 2026-05-11
UAL1583 United Airlines 5 2026-07-18
UAL2605 United Airlines 4 2026-06-04
UAL2426 - 4 2026-06-24
UAL2316 United Airlines 4 2026-07-18
UAL2088 United Airlines 4 2026-05-13
UAL2000 - 4 2026-06-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2354 BUR → SFO Jul 26, 17:20 UTCJul 26, 20:40 UTC3h 20m
2026-07-26 UAL2368 SFO → DEN Jul 26, 14:00 UTCJul 26, 15:50 UTC1h 50m
2026-07-26 UAL1531 ORD → CMH Jul 26, 01:30 UTCJul 26, 05:10 UTC3h 40m
2026-07-25 UAL2071 SNA → EWR Jul 25, 20:50 UTCJul 25, 23:20 UTC2h 30m
2026-07-25 UAL2008 IAH → LGA Jul 25, 16:25 UTCJul 25, 18:25 UTC2h 0m
2026-07-25 UAL1775 SFO → PHX Jul 25, 12:30 UTCJul 25, 14:00 UTC1h 30m
2026-07-25 UAL1924 SAN → SFO Jul 25, 06:15 UTCJul 25, 09:05 UTC2h 50m
2026-07-25 UAL2339 LAS → LAX Jul 25, 02:00 UTCJul 25, 03:55 UTC1h 55m
2026-07-24 UAL489 DEN → IAH Jul 24, 22:00 UTCJul 25, 00:00 UTC2h 0m
2026-07-24 UAL2168 JAX → IAH Jul 24, 18:00 UTCJul 24, 19:55 UTC1h 55m
2026-07-24 UAL1720 SFO → MSY Jul 24, 14:10 UTCJul 24, 16:05 UTC1h 55m
2026-07-24 UAL2829 GUM → SFO Jul 24, 03:00 UTCJul 24, 04:50 UTC1h 50m
2026-07-24 UAL2829 GUM → SFO Jul 24, 03:03 UTCJul 24, 04:51 UTC1h 48m
2026-07-23 UAL576 MIA → DEN Jul 23, 21:10 UTCJul 24, 01:00 UTC3h 50m
2026-07-23 UAL1946 ORD → LGA Jul 23, 15:25 UTCJul 23, 18:55 UTC3h 30m
2026-07-23 UAL531T DEN → LAX Jul 23, 05:05 UTCJul 23, 07:00 UTC1h 55m
2026-07-22 UAL2834 GUM → SFO Jul 22, 23:15 UTCJul 23, 03:15 UTC4h 0m
2026-07-22 UAL2834 GUM → SFO Jul 22, 23:05 UTCJul 23, 03:09 UTC4h 4m
2026-07-22 UAL2446 DEN → LGA Jul 22, 16:10 UTCJul 22, 19:30 UTC3h 20m
2026-07-22 UAL2601 RSW → EWR Jul 22, 12:20 UTCJul 22, 14:30 UTC2h 10m
2026-07-22 UAL360 DFW → EWR Jul 22, 01:45 UTCJul 22, 04:05 UTC2h 20m
2026-07-21 UAL484 DEN → LAS Jul 21, 22:00 UTCJul 21, 23:55 UTC1h 55m
2026-07-21 UAL1599 MSY → IAD Jul 21, 18:20 UTCJul 21, 20:20 UTC2h 0m
2026-07-21 UAL647 BOS → DEN Jul 21, 12:25 UTCJul 21, 16:45 UTC4h 20m
2026-07-20 UAL597 EWR → LAS Jul 20, 20:50 UTCJul 21, 00:10 UTC3h 20m
2026-07-20 UAL581 - Jul 20, 16:25 UTCJul 20, 18:40 UTC2h 15m
2026-07-20 UAL1775 SFO → PHX Jul 20, 12:25 UTCJul 20, 14:10 UTC1h 45m
2026-07-20 UAL1924 SAN → SFO Jul 20, 06:25 UTCJul 20, 09:15 UTC2h 50m
2026-07-19 UAL2046 MCO → EWR Jul 19, 23:25 UTCJul 20, 02:50 UTC3h 25m
2026-07-19 UAL598 DEN → LGA Jul 19, 18:40 UTCJul 19, 21:45 UTC3h 5m
2026-07-19 UAL1450 EWR → PBI Jul 19, 15:10 UTCJul 19, 17:00 UTC1h 50m
2026-07-18 UAL8154 YUL → EWR Jul 18, 23:20 UTCJul 19, 01:20 UTC2h 0m
2026-07-18 UAL8154 YUL → EWR Jul 18, 23:33 UTCJul 19, 01:21 UTC1h 48m
2026-07-18 UAL1583 IAH → LGA Jul 18, 18:00 UTCJul 18, 21:15 UTC3h 15m
2026-07-18 UAL2316 DSM → DEN Jul 18, 14:35 UTCJul 18, 15:55 UTC1h 20m
2026-07-18 UAL1066 - Jul 18, 03:30 UTCJul 18, 05:20 UTC1h 50m
2026-07-18 UAL1954 - Jul 18, 00:10 UTCJul 18, 02:09 UTC2h 0m
2026-07-17 UAL1583 IAH → LGA Jul 17, 17:50 UTCJul 17, 21:10 UTC3h 20m
2026-07-17 UAL2316 DSM → DEN Jul 17, 14:20 UTCJul 17, 15:40 UTC1h 20m
2026-07-17 UAL2829 - Jul 17, 02:59 UTCJul 17, 04:59 UTC2h 0m
2026-07-16 UAL576 ORD → LAX Jul 16, 21:23 UTCJul 17, 01:18 UTC3h 55m
2026-07-16 UAL576 ORD → LAX Jul 16, 21:35 UTCJul 17, 01:25 UTC3h 50m
2026-07-16 UAL1946 - Jul 16, 15:55 UTCJul 16, 19:30 UTC3h 35m
2026-07-16 UAL2499 ORD → LAX Jul 16, 01:55 UTCJul 16, 05:35 UTC3h 40m
2026-07-15 UAL2832 RSW → ORD Jul 15, 20:45 UTCJul 15, 23:25 UTC2h 40m
2026-07-15 UAL2832 RSW → ORD Jul 15, 20:53 UTCJul 15, 23:08 UTC2h 15m
2026-07-15 UAL2601 DEN → RSW Jul 15, 16:00 UTCJul 15, 19:25 UTC3h 25m
2026-07-15 UAL2031 IAD → DEN Jul 15, 10:50 UTCJul 15, 13:45 UTC2h 55m
2026-07-14 UAL421 DEN → IAD Jul 14, 22:15 UTCJul 15, 01:20 UTC3h 4m
2026-07-14 UAL577 EWR → DEN Jul 14, 17:50 UTCJul 14, 21:00 UTC3h 10m

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 Jul 26, 20:55 UTC.
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 UAL576, UAL1946, UAL2666, UAL2487, UAL1954.