Apparatus

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sensors Mode-S transponder

A55D31

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N445AA · AIRBUS A-321neo · operated by AMERICAN AIRLINES INC

Hex
A55D31
Octal
51256461
Decimal
10,837,297
Country
US
Tail
N445AA
Type
A21N
Broadcasting now · callsign AAL1355 · 5,200 ft
Flights observed
388
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

A55D31 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A55D31 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
AAL675 - 9 2026-07-03
AAL144 - 7 2026-07-05
AAL2585 - 6 2026-07-11
AAL3328 American Airlines 5 2026-06-12
AAL3258 American Airlines 5 2026-05-28
AAL2045 American Airlines 5 2026-07-07
AAL1928 - 5 2026-07-08
AAL1524 American Airlines 5 2026-05-28
AAL692 - 4 2026-07-04
AAL3272 American Airlines 4 2026-04-17
AAL3245 American Airlines 4 2026-05-14
AAL3016 - 4 2026-06-21
AAL2888 American Airlines 4 2026-04-16
AAL2838 American Airlines 4 2026-04-23
AAL2793 - 4 2026-04-13
AAL266 American Airlines 4 2026-05-27
AAL246 American Airlines 4 2026-05-19
AAL2277 American Airlines 4 2026-05-08
AAL1580 - 4 2026-07-12
AAL119 American Airlines 4 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 AAL1355 DFW → ANC Jul 13, 20:20 UTCJul 14, 02:55 UTC6h 35m
2026-07-13 AAL417 PHL → DFW Jul 13, 15:30 UTCJul 13, 18:25 UTC2h 55m
2026-07-13 AAL2764 BOS → PHL Jul 13, 12:08 UTCJul 13, 13:07 UTC59m
2026-07-13 AAL2764 BOS → PHL Jul 13, 12:10 UTCJul 13, 13:10 UTC1h 0m
2026-07-12 AAL366 PHX → BOS Jul 12, 20:05 UTCJul 13, 00:55 UTC4h 50m
2026-07-12 AAL2820 - Jul 12, 14:20 UTCJul 12, 18:35 UTC4h 15m
2026-07-12 AAL2820 PHL → PHX Jul 12, 14:17 UTCJul 12, 18:33 UTC4h 16m
2026-07-12 AAL2820 PHL → PHL Jul 12, 13:55 UTCJul 12, 14:01 UTC5m
2026-07-12 AAL2695 - Jul 12, 08:01 UTCJul 12, 12:45 UTC4h 45m
2026-07-12 AAL1580 - Jul 12, 01:30 UTCJul 12, 06:10 UTC4h 40m
2026-07-11 AAL1159 - Jul 11, 19:30 UTCJul 11, 23:55 UTC4h 25m
2026-07-11 AAL824 - Jul 11, 12:50 UTCJul 11, 17:45 UTC4h 55m
2026-07-11 AAL2585 PHX → PHL Jul 11, 06:20 UTCJul 11, 10:10 UTC3h 50m
2026-07-11 AAL3239 DFW → PHX Jul 11, 02:45 UTCJul 11, 04:40 UTC1h 55m
2026-07-10 AAL2994 - Jul 10, 22:25 UTCJul 11, 01:20 UTC2h 55m
2026-07-10 AAL1213 - Jul 10, 16:15 UTCJul 10, 20:30 UTC4h 15m
2026-07-10 AAL3044 - Jul 10, 13:05 UTCJul 10, 14:50 UTC1h 45m
2026-07-10 AAL988 - Jul 10, 05:15 UTCJul 10, 05:55 UTC40m
2026-07-10 AAL988 LIM → MIA Jul 10, 04:58 UTCJul 10, 10:28 UTC5h 30m
2026-07-09 AAL917 - Jul 9, 22:10 UTCJul 10, 03:00 UTC4h 50m
2026-07-09 AAL2912 - Jul 9, 17:40 UTCJul 9, 19:10 UTC1h 30m
2026-07-09 AAL2530 ORD → CLT Jul 9, 14:06 UTCJul 9, 15:40 UTC1h 34m
2026-07-09 AAL1354 ORD → ANC Jul 9, 07:08 UTCJul 9, 12:36 UTC5h 28m
2026-07-09 AAL1354 - Jul 9, 07:10 UTCJul 9, 12:55 UTC5h 45m
2026-07-08 AAL1354 - Jul 8, 23:50 UTCJul 9, 05:50 UTC6h 0m
2026-07-08 AAL2608 - Jul 8, 17:40 UTCJul 8, 21:10 UTC3h 30m
2026-07-08 AAL1928 - Jul 8, 11:35 UTCJul 8, 16:10 UTC4h 35m
2026-07-08 AAL2192 ORD → SFO Jul 8, 00:55 UTCJul 8, 05:25 UTC4h 30m
2026-07-07 AAL2031 - Jul 7, 18:25 UTCJul 7, 23:25 UTC5h 0m
2026-07-07 AAL2499 MCO → PHL Jul 7, 14:46 UTCJul 7, 16:45 UTC1h 59m
2026-07-07 AAL2499 MCO → PHL Jul 7, 14:50 UTCJul 7, 16:50 UTC2h 0m
2026-07-07 AAL2093 PHL → MCO Jul 7, 11:10 UTCJul 7, 13:15 UTC2h 5m
2026-07-07 AAL2093 PHL → MCO Jul 7, 11:11 UTCJul 7, 13:11 UTC2h 0m
2026-07-07 AAL2045 MIA → SFO Jul 7, 04:25 UTCJul 7, 09:10 UTC4h 45m
2026-07-06 AAL2045 MIA → SFO Jul 6, 21:00 UTCJul 7, 02:25 UTC5h 25m
2026-07-06 AAL1151 - Jul 6, 14:30 UTCJul 6, 19:15 UTC4h 45m
2026-07-06 AAL1151 LAX → PHL Jul 6, 14:27 UTCJul 6, 19:14 UTC4h 47m
2026-07-05 AAL254 OGG → LAX Jul 5, 23:24 UTCJul 6, 04:07 UTC4h 43m
2026-07-05 AAL271 - Jul 5, 16:25 UTCJul 5, 17:35 UTC1h 10m
2026-07-05 AAL271 LAX → OGG Jul 5, 16:24 UTCJul 5, 21:55 UTC5h 31m
2026-07-05 AAL144 - Jul 5, 06:45 UTCJul 5, 11:25 UTC4h 40m
2026-07-04 AAL143 - Jul 4, 23:10 UTCJul 4, 23:40 UTC30m
2026-07-04 AAL143 LAX → HNL Jul 4, 23:05 UTCJul 5, 04:54 UTC5h 49m
2026-07-04 AAL3334 - Jul 4, 19:55 UTCJul 4, 21:10 UTC1h 15m
2026-07-04 AAL3334 - Jul 4, 18:30 UTCJul 4, 19:20 UTC50m
2026-07-04 AAL1139 RDU → LGA Jul 4, 14:40 UTCJul 4, 16:30 UTC1h 50m
2026-07-04 AAL1139 RDU → LGA Jul 4, 14:38 UTCJul 4, 16:36 UTC1h 58m
2026-07-04 AAL692 - Jul 4, 11:35 UTCJul 4, 12:40 UTC1h 5m
2026-07-04 AAL692 - Jul 4, 07:30 UTCJul 4, 07:45 UTC15m
2026-07-03 AAL675 - Jul 3, 23:50 UTCJul 4, 00:00 UTC10m

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 N445AA page for operator, model, and routing details .

Mode-S A55D31 frequently asked

What is Mode-S code A55D31?
A55D31 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N445AA.
Where is Mode-S A55D31 registered?
Mode-S code A55D31 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 A55D31 broadcasting right now?
Yes. Mode-S A55D31 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A55D31, octal 51256461, decimal 10,837,297.
What flights does A55D31 operate?
Mode-S A55D31 has broadcast 20 distinct callsigns, including AAL675, AAL144, AAL2585, AAL3328, AAL3258.