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 UAL2033 · 33,000 ft
Flights observed
381
Distinct callsigns
20
Country
US
Last broadcast
1h ago

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
UAL695 United Airlines 9 2026-05-10
UAL2089 United Airlines 9 2026-05-10
UAL2088 - 9 2026-07-08
UAL1996 - 9 2026-07-08
UAL1525 United Airlines 8 2026-06-15
UAL2295 United Airlines 7 2026-06-15
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
UAL675 - 4 2026-06-26
UAL617 - 4 2026-06-13
UAL353 - 4 2026-06-18
UAL2494 - 4 2026-06-18
UAL2455 United Airlines 4 2026-05-22
UAL214 United Airlines 4 2026-05-10
UAL2108 United Airlines 4 2026-05-10
UAL2106 United Airlines 4 2026-04-29
UAL2091 United Airlines 4 2026-04-29
UAL1448 - 4 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL2033 - Jul 14, 00:25 UTCJul 14, 00:45 UTC20m
2026-07-13 UAL360 - Jul 13, 20:15 UTCJul 13, 22:15 UTC2h 0m
2026-07-13 UAL360 LAX → DEN Jul 13, 20:04 UTCJul 13, 22:12 UTC2h 8m
2026-07-13 UAL405 DEN → LAX Jul 13, 16:15 UTCJul 13, 18:10 UTC1h 55m
2026-07-13 UAL2601 SEA → DEN Jul 13, 12:10 UTCJul 13, 14:25 UTC2h 15m
2026-07-13 UAL360 DEN → SEA Jul 13, 02:01 UTCJul 13, 04:25 UTC2h 25m
2026-07-12 UAL1729 LGA → DEN Jul 12, 19:35 UTCJul 12, 22:55 UTC3h 20m
2026-07-12 UAL1442 DEN → LGA Jul 12, 14:21 UTCJul 12, 17:55 UTC3h 34m
2026-07-12 UAL1442 DEN → LGA Jul 12, 14:35 UTCJul 12, 17:55 UTC3h 20m
2026-07-12 UAL2806 ORD → DEN Jul 12, 11:24 UTCJul 12, 13:01 UTC1h 37m
2026-07-12 UAL2806 ORD → DEN Jul 12, 11:10 UTCJul 12, 13:05 UTC1h 55m
2026-07-12 UAL1998 EWR → ORD Jul 12, 00:40 UTCJul 12, 02:30 UTC1h 50m
2026-07-11 UAL2329 - Jul 11, 20:00 UTCJul 11, 21:30 UTC1h 30m
2026-07-11 UAL1069 - Jul 11, 14:15 UTCJul 11, 17:50 UTC3h 35m
2026-07-11 UAL1531 ORD → SAN Jul 11, 02:00 UTCJul 11, 05:35 UTC3h 35m
2026-07-10 UAL1023 DEN → ORD Jul 10, 21:30 UTCJul 10, 23:25 UTC1h 55m
2026-07-10 UAL1023 DEN → ORD Jul 10, 21:25 UTCJul 10, 23:06 UTC1h 41m
2026-07-10 UAL2843 - Jul 10, 17:15 UTCJul 10, 19:05 UTC1h 50m
2026-07-10 UAL2666 ORD → DEN Jul 10, 13:50 UTCJul 10, 15:45 UTC1h 55m
2026-07-10 UAL2829 - Jul 10, 02:55 UTCJul 10, 04:45 UTC1h 50m
2026-07-10 UAL2829 LAX → DEN Jul 10, 03:03 UTCJul 10, 04:42 UTC1h 39m
2026-07-09 UAL576 ORD → LAX Jul 9, 21:25 UTCJul 10, 01:15 UTC3h 50m
2026-07-09 UAL1946 - Jul 9, 15:25 UTCJul 9, 19:00 UTC3h 35m
2026-07-09 UAL1946 LAX → ORD Jul 9, 15:37 UTCJul 9, 18:44 UTC3h 7m
2026-07-09 UAL661 - Jul 9, 03:45 UTCJul 9, 07:30 UTC3h 45m
2026-07-08 UAL2088 - Jul 8, 22:35 UTCJul 9, 00:35 UTC2h 0m
2026-07-08 UAL2088 - Jul 8, 20:20 UTCJul 8, 20:30 UTC10m
2026-07-08 UAL1996 - Jul 8, 14:15 UTCJul 8, 18:35 UTC4h 20m
2026-07-07 UAL2320 LAS → ORD Jul 7, 23:20 UTCJul 8, 02:20 UTC3h 0m
2026-07-07 UAL777 ORD → LAS Jul 7, 18:05 UTCJul 7, 21:15 UTC3h 10m
2026-07-07 UAL1998 - Jul 7, 00:05 UTCJul 7, 01:50 UTC1h 45m
2026-07-06 UAL2329 RNO → SFO Jul 6, 20:40 UTCJul 6, 22:15 UTC1h 35m
2026-07-05 UAL259 DEN → ORD Jul 5, 03:55 UTCJul 5, 05:45 UTC1h 50m
2026-07-04 UAL1587 IAD → DEN Jul 4, 17:20 UTCJul 4, 20:35 UTC3h 15m
2026-07-04 UAL1535 - Jul 4, 14:45 UTCJul 4, 15:25 UTC40m
2026-07-04 UAL529 IAD → RDU Jul 4, 12:35 UTCJul 4, 13:15 UTC40m
2026-07-04 UAL2408 DEN → IAD Jul 4, 01:20 UTCJul 4, 04:20 UTC3h 0m
2026-07-03 UAL1741 - Jul 3, 19:55 UTCJul 3, 20:50 UTC55m
2026-07-03 UAL1402 DEN → ABQ Jul 3, 17:30 UTCJul 3, 18:25 UTC55m
2026-07-02 UAL1354 RSW → DEN Jul 2, 22:50 UTCJul 3, 02:15 UTC3h 25m
2026-07-02 UAL1102 ORD → RSW Jul 2, 18:50 UTCJul 2, 21:15 UTC2h 25m
2026-07-02 UAL2616 - Jul 2, 11:30 UTCJul 2, 13:30 UTC2h 0m
2026-07-02 UAL475 - Jul 2, 02:05 UTCJul 2, 04:10 UTC2h 5m
2026-07-01 UAL484 - Jul 1, 22:05 UTCJul 2, 00:00 UTC1h 55m
2026-07-01 UAL1448 - Jul 1, 18:10 UTCJul 1, 20:20 UTC2h 10m
2026-07-01 UAL1448 ORD → IAH Jul 1, 18:09 UTCJul 1, 20:09 UTC2h 0m
2026-07-01 UAL580 - Jul 1, 12:25 UTCJul 1, 15:55 UTC3h 30m
2026-07-01 UAL576 - Jul 1, 00:20 UTCJul 1, 04:10 UTC3h 50m
2026-06-30 UAL1325 DCA → ORD Jun 30, 19:40 UTCJun 30, 21:10 UTC1h 30m
2026-06-30 UAL2668 - Jun 30, 16:35 UTCJun 30, 18:00 UTC1h 25m

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 UAL695, UAL2089, UAL2088, UAL1996, UAL1525.