Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A0DDFB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N155NN · AIRBUS A-321 · operated by AMERICAN AIRLINES INC

Hex
A0DDFB
Octal
50156773
Decimal
10,542,587
Country
US
Tail
N155NN
Type
A321
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
489
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A0DDFB.

Country allocation

The ICAO 24-bit address A0DDFB 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
AAL2362 - 8 2026-06-15
AAL1032 - 7 2026-06-29
AAL3064 American Airlines 6 2026-05-02
AAL3205 American Airlines 5 2026-06-01
AAL3156 - 5 2026-07-12
AAL2676 American Airlines 5 2026-05-12
AAL1012 American Airlines 5 2026-04-15
AAL559 American Airlines 4 2026-05-25
AAL3202 American Airlines 4 2026-04-23
AAL2710 American Airlines 4 2026-04-15
AAL2555 - 4 2026-06-26
AAL2339 American Airlines 4 2026-04-17
AAL2081 American Airlines 4 2026-07-20
AAL1292 - 4 2026-07-14
AAL1229 - 4 2026-06-27
AAL1054 American Airlines 4 2026-07-25
AAL929Q - 3 2026-06-22
AAL750 - 3 2026-07-12
AAL625 American Airlines 3 2026-05-08
AAL487 American Airlines 3 2026-04-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL3103 BDL → DFW Jul 26, 22:00 UTCJul 26, 22:45 UTC45m
2026-07-26 AAL3289 SBN → DFW Jul 26, 17:35 UTCJul 26, 20:30 UTC2h 55m
2026-07-26 AAL3289 SBN → DFW Jul 26, 17:35 UTCJul 26, 20:28 UTC2h 53m
2026-07-26 AAL1227 LGA → CLT Jul 26, 13:15 UTCJul 26, 15:40 UTC2h 25m
2026-07-26 AAL1227 LGA → CLT Jul 26, 13:11 UTCJul 26, 15:40 UTC2h 29m
2026-07-26 AAL1178 DCA → MIA Jul 26, 09:13 UTCJul 26, 11:23 UTC2h 10m
2026-07-26 AAL1178 DCA → MIA Jul 26, 09:15 UTCJul 26, 11:25 UTC2h 10m
2026-07-26 AAL2897 PHL → LAX Jul 26, 01:10 UTCJul 26, 03:20 UTC2h 10m
2026-07-25 AAL1565 DFW → CMH Jul 25, 19:50 UTCJul 25, 22:40 UTC2h 50m
2026-07-25 AAL1565 DFW → CMH Jul 25, 15:35 UTCJul 25, 18:15 UTC2h 40m
2026-07-25 AAL873 MHT → CLT Jul 25, 10:15 UTCJul 25, 13:05 UTC2h 50m
2026-07-25 AAL1054 MIA → BOS Jul 25, 02:00 UTCJul 25, 04:45 UTC2h 45m
2026-07-25 AAL1054 MIA → BOS Jul 25, 01:59 UTCJul 25, 04:45 UTC2h 46m
2026-07-24 AAL1800 BOS → CLT Jul 24, 21:15 UTCJul 24, 23:45 UTC2h 30m
2026-07-24 AAL1800 BOS → CLT Jul 24, 21:00 UTCJul 24, 23:40 UTC2h 40m
2026-07-24 AAL2739 MIA → CUR Jul 24, 17:00 UTCJul 24, 19:25 UTC2h 25m
2026-07-24 AAL2739 MIA → CUR Jul 24, 16:58 UTCJul 24, 19:34 UTC2h 36m
2026-07-24 AAL2017 LAX → AUS Jul 24, 11:45 UTCJul 24, 14:10 UTC2h 25m
2026-07-23 AAL1922 MIA → JFK Jul 23, 23:05 UTCJul 24, 01:40 UTC2h 35m
2026-07-23 AAL1922 MIA → JFK Jul 23, 23:02 UTCJul 24, 01:30 UTC2h 28m
2026-07-23 AAL683 JFK → MIA Jul 23, 18:42 UTCJul 23, 21:22 UTC2h 40m
2026-07-23 AAL683 - Jul 23, 18:45 UTCJul 23, 21:25 UTC2h 40m
2026-07-23 AAL1052 - Jul 23, 14:25 UTCJul 23, 16:50 UTC2h 25m
2026-07-23 AAL3189 AEX → DFW Jul 23, 10:15 UTCJul 23, 12:40 UTC2h 25m
2026-07-23 AAL2239 DFW → SFO Jul 23, 03:35 UTCJul 23, 06:25 UTC2h 50m
2026-07-22 AAL2239 DFW → SFO Jul 22, 23:45 UTCJul 23, 02:20 UTC2h 35m
2026-07-22 AAL1215 DFW → PVR Jul 22, 16:00 UTCJul 22, 21:50 UTC5h 50m
2026-07-22 AAL977 DFW → MTJ Jul 22, 11:15 UTCJul 22, 14:00 UTC2h 45m
2026-07-22 AAL2469 SNA → DFW Jul 22, 01:40 UTCJul 22, 04:10 UTC2h 30m
2026-07-22 AAL2469 SNA → DFW Jul 22, 01:39 UTCJul 22, 04:06 UTC2h 27m
2026-07-21 AAL2229 PHX → BOS Jul 21, 22:50 UTCJul 22, 00:10 UTC1h 20m
2026-07-21 AAL2229 PHX → BOS Jul 21, 20:25 UTCJul 21, 21:45 UTC1h 20m
2026-07-21 AAL2222 ORD → DFW Jul 21, 17:25 UTCJul 21, 19:10 UTC1h 45m
2026-07-21 AAL1059 DFW → ORD Jul 21, 13:55 UTCJul 21, 15:50 UTC1h 55m
2026-07-20 AAL2081 SMF → DFW Jul 20, 14:50 UTCJul 20, 14:55 UTC5m
2026-07-20 AAL2575 - Jul 20, 11:15 UTCJul 20, 13:45 UTC2h 30m
2026-07-19 AAL2517 - Jul 19, 16:55 UTCJul 19, 22:30 UTC5h 35m
2026-07-19 AAL970 - Jul 19, 12:30 UTCJul 19, 15:10 UTC2h 40m
2026-07-19 AAL3229 - Jul 19, 05:20 UTCJul 19, 07:45 UTC2h 25m
2026-07-18 AAL1870 MSP → MIA Jul 18, 11:20 UTCJul 18, 14:55 UTC3h 35m
2026-07-18 AAL458 - Jul 18, 03:25 UTCJul 18, 06:30 UTC3h 5m
2026-07-17 AAL2910 ORD → MIA Jul 17, 23:00 UTCJul 18, 01:45 UTC2h 45m
2026-07-17 AAL2252 - Jul 17, 17:40 UTCJul 17, 20:50 UTC3h 10m
2026-07-17 AAL1282 - Jul 17, 11:55 UTCJul 17, 16:19 UTC4h 25m
2026-07-17 AAL2156 PHX → EWR Jul 17, 06:25 UTCJul 17, 10:44 UTC4h 20m
2026-07-17 AAL2156 PHX → EWR Jul 17, 06:24 UTCJul 17, 10:47 UTC4h 23m
2026-07-16 AAL1984 SJC → CLT Jul 16, 21:55 UTCJul 17, 02:25 UTC4h 30m
2026-07-16 AAL3219 SEA → PHL Jul 16, 15:55 UTCJul 16, 20:29 UTC4h 35m
2026-07-16 AAL2003 DFW → SEA Jul 16, 01:40 UTCJul 16, 05:10 UTC3h 30m
2026-07-15 AAL2238 TUL → DFW Jul 15, 22:53 UTCJul 15, 23:58 UTC1h 5m

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 N155NN page for operator, model, and routing details .

Mode-S A0DDFB frequently asked

What is Mode-S code A0DDFB?
A0DDFB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N155NN.
Where is Mode-S A0DDFB registered?
Mode-S code A0DDFB 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 A0DDFB broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0DDFB, octal 50156773, decimal 10,542,587.
What flights does A0DDFB operate?
Mode-S A0DDFB has broadcast 20 distinct callsigns, including AAL2362, AAL1032, AAL3064, AAL3205, AAL3156.