Apparatus

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sensors Mode-S transponder

A24573

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N24537 · AIRBUS A-321neo · operated by UNITED AIRLINES INC

Hex
A24573
Octal
50442563
Decimal
10,634,611
Country
US
Tail
N24537
Type
A21N
Broadcasting now · callsign UAL495 · 37,975 ft
Flights observed
444
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:20 UTC

Current position

A24573 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A24573 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
UAL2088 - 11 2026-07-18
UAL1996 United Airlines 11 2026-07-18
UAL695 United Airlines 9 2026-05-10
UAL2295 United Airlines 9 2026-07-23
UAL2089 United Airlines 9 2026-05-10
UAL1525 - 9 2026-07-23
UAL212 United Airlines 7 2026-06-09
UAL1568 United Airlines 7 2026-06-04
UAL1363 United Airlines 6 2026-06-08
UAL2408 - 5 2026-07-04
UAL2106 United Airlines 5 2026-07-25
UAL2091 United Airlines 5 2026-07-26
UAL1132 - 5 2026-07-17
UAL675 - 4 2026-06-26
UAL617 - 4 2026-06-13
UAL495 - 4 2026-07-17
UAL353 - 4 2026-06-18
UAL2494 - 4 2026-06-18
UAL2455 United Airlines 4 2026-05-22
UAL214 United Airlines 4 2026-05-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1693 ORD → RIC Jul 26, 19:15 UTCJul 26, 21:10 UTC1h 55m
2026-07-26 UAL2091 SFO → SBA Jul 26, 13:15 UTCJul 26, 17:00 UTC3h 45m
2026-07-26 UAL8108 SFO → BOS Jul 26, 03:25 UTCJul 26, 07:10 UTC3h 46m
2026-07-25 UAL1779 MIA → EWR Jul 25, 21:20 UTCJul 26, 01:00 UTC3h 40m
2026-07-25 UAL1940 IAD → ATL Jul 25, 17:50 UTCJul 25, 19:45 UTC1h 55m
2026-07-25 UAL1758 DEN → KOA Jul 25, 13:35 UTCJul 25, 15:35 UTC2h 0m
2026-07-25 UAL2106 IAH → EWR Jul 25, 03:10 UTCJul 25, 07:10 UTC4h 0m
2026-07-25 UAL2487 RSW → EWR Jul 25, 01:10 UTCJul 25, 01:30 UTC20m
2026-07-24 UAL2487 RSW → EWR Jul 24, 21:30 UTCJul 25, 01:30 UTC4h 0m
2026-07-24 UAL2487 RSW → EWR Jul 24, 21:44 UTCJul 25, 00:54 UTC3h 10m
2026-07-24 UAL1044 EWR → DEN Jul 24, 16:15 UTCJul 24, 19:50 UTC3h 35m
2026-07-24 UAL2616 ATL → EWR Jul 24, 11:20 UTCJul 24, 13:25 UTC2h 5m
2026-07-24 UAL2813 ORD → IAH Jul 24, 01:55 UTCJul 24, 03:50 UTC1h 55m
2026-07-23 UAL2497 ORD → BOS Jul 23, 22:35 UTCJul 24, 00:00 UTC1h 25m
2026-07-23 UAL2794 GUM → SFO Jul 23, 18:50 UTCJul 23, 20:05 UTC1h 15m
2026-07-23 UAL1525 - Jul 23, 14:55 UTCJul 23, 16:55 UTC2h 0m
2026-07-23 UAL2295 PHX → EWR Jul 23, 11:15 UTCJul 23, 12:50 UTC1h 35m
2026-07-23 UAL2295 PHX → EWR Jul 23, 11:24 UTCJul 23, 12:46 UTC1h 22m
2026-07-23 UAL1457 DEN → LGA Jul 23, 05:40 UTCJul 23, 08:47 UTC3h 7m
2026-07-23 UAL1457 DEN → LGA Jul 23, 05:30 UTCJul 23, 09:00 UTC3h 30m
2026-07-22 UAL745 FLL → DEN Jul 22, 21:45 UTCJul 23, 01:25 UTC3h 40m
2026-07-22 UAL2475 ORD → CLE Jul 22, 16:45 UTCJul 22, 19:10 UTC2h 25m
2026-07-22 UAL2280 LAX → BOS Jul 22, 12:50 UTCJul 22, 15:00 UTC2h 10m
2026-07-22 UAL1389 CMH → DEN Jul 22, 02:15 UTCJul 22, 04:25 UTC2h 10m
2026-07-21 UAL333 BOS → LAX Jul 21, 21:55 UTCJul 22, 00:30 UTC2h 35m
2026-07-21 UAL1424 ORD → AUS Jul 21, 17:43 UTCJul 21, 19:53 UTC2h 10m
2026-07-21 UAL1424 ORD → AUS Jul 21, 17:40 UTCJul 21, 19:55 UTC2h 15m
2026-07-21 UAL2368 SFO → DEN Jul 21, 13:50 UTCJul 21, 15:50 UTC2h 0m
2026-07-20 UAL745 FLL → DEN Jul 20, 21:35 UTCJul 21, 01:10 UTC3h 35m
2026-07-20 UAL2827 - Jul 20, 19:35 UTCJul 20, 19:40 UTC5m
2026-07-20 UAL2827 IAH → ORD Jul 20, 17:20 UTCJul 20, 19:40 UTC2h 20m
2026-07-20 UAL2827 IAH → ORD Jul 20, 17:12 UTCJul 20, 19:16 UTC2h 4m
2026-07-20 UAL1231 RDU → EWR Jul 20, 13:10 UTCJul 20, 15:10 UTC2h 0m
2026-07-20 UAL1231 RDU → EWR Jul 20, 13:08 UTCJul 20, 15:03 UTC1h 55m
2026-07-20 UAL2649 ORD → LAX Jul 20, 04:00 UTCJul 20, 05:45 UTC1h 45m
2026-07-20 UAL2649 ORD → LAX Jul 20, 03:59 UTCJul 20, 05:33 UTC1h 34m
2026-07-19 UAL2834 LGA → DEN Jul 19, 21:20 UTCJul 20, 00:55 UTC3h 35m
2026-07-19 UAL2446 DEN → LGA Jul 19, 16:10 UTCJul 19, 19:19 UTC3h 9m
2026-07-19 UAL2446 DEN → LGA Jul 19, 16:10 UTCJul 19, 19:20 UTC3h 10m
2026-07-19 UAL1479 - Jul 19, 12:20 UTCJul 19, 14:25 UTC2h 5m
2026-07-19 UAL8126 ORD → SFO Jul 19, 03:05 UTCJul 19, 06:50 UTC3h 45m
2026-07-18 UAL2088 - Jul 18, 22:25 UTCJul 19, 00:30 UTC2h 5m
2026-07-18 UAL2088 - Jul 18, 20:05 UTCJul 18, 20:20 UTC15m
2026-07-18 UAL1996 ORD → SJU Jul 18, 14:19 UTCJul 18, 18:26 UTC4h 7m
2026-07-18 UAL1996 ORD → SJU Jul 18, 14:20 UTCJul 18, 18:30 UTC4h 10m
2026-07-18 UAL2258 DEN → ORD Jul 18, 01:50 UTCJul 18, 03:50 UTC2h 1m
2026-07-17 UAL1132 CUN → DEN Jul 17, 19:30 UTCJul 17, 23:00 UTC3h 30m
2026-07-17 UAL1119 DEN → CUN Jul 17, 14:30 UTCJul 17, 17:50 UTC3h 20m
2026-07-17 UAL495 IAD → DEN Jul 17, 02:45 UTCJul 17, 05:45 UTC3h 0m
2026-07-17 UAL495 IAD → DEN Jul 17, 02:38 UTCJul 17, 05:44 UTC3h 6m

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 N24537 page for operator, model, and routing details .

Mode-S A24573 frequently asked

What is Mode-S code A24573?
A24573 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N24537.
Where is Mode-S A24573 registered?
Mode-S code A24573 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 A24573 broadcasting right now?
Yes. Mode-S A24573 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A24573, octal 50442563, decimal 10,634,611.
What flights does A24573 operate?
Mode-S A24573 has broadcast 20 distinct callsigns, including UAL2088, UAL1996, UAL695, UAL2295, UAL2089.