Apparatus

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sensors Mode-S transponder

ACBFFD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N920US · AIRBUS A-321 · operated by AMERICAN AIRLINES INC

Hex
ACBFFD
Octal
53137775
Decimal
11,321,341
Country
US
Tail
N920US
Type
A321
Broadcasting now · callsign N920US
Flights observed
492
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Current position

ACBFFD is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address ACBFFD 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
AAL2127 American Airlines 7 2026-06-06
AAL2003 American Airlines 6 2026-07-20
AAL1415 - 6 2026-07-10
AAL717 - 5 2026-07-11
AAL2759 - 5 2026-06-20
AAL2708 American Airlines 5 2026-07-01
AAL2584 - 5 2026-07-01
AAL2117 American Airlines 5 2026-07-22
AAL1043 American Airlines 5 2026-06-14
AAL844 - 4 2026-07-14
AAL799 - 4 2026-06-26
AAL674 American Airlines 4 2026-07-09
AAL3224 American Airlines 4 2026-05-07
AAL3114 American Airlines 4 2026-06-14
AAL2928 American Airlines 4 2026-05-11
AAL2876 American Airlines 4 2026-06-17
AAL2857 - 4 2026-07-09
AAL2670 American Airlines 4 2026-07-25
AAL2305 - 4 2026-06-17
AAL2286 - 4 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL536 EWR → DFW Jul 26, 20:35 UTCJul 26, 21:15 UTC40m
2026-07-26 AAL1952 LAX → CLT Jul 26, 14:50 UTCJul 26, 19:15 UTC4h 25m
2026-07-25 AAL2055 SFO → MIA Jul 25, 23:45 UTCJul 26, 03:55 UTC4h 10m
2026-07-25 AAL2055 SFO → MIA Jul 25, 23:41 UTCJul 26, 03:52 UTC4h 11m
2026-07-25 AAL1179 ORD → SNA Jul 25, 18:24 UTCJul 25, 21:29 UTC3h 5m
2026-07-25 AAL1179 ORD → SNA Jul 25, 13:35 UTCJul 25, 21:15 UTC7h 40m
2026-07-25 AAL2670 FLL → CLT Jul 25, 10:35 UTCJul 25, 11:40 UTC1h 5m
2026-07-25 AAL2670 FLL → CLT Jul 25, 10:30 UTCJul 25, 11:37 UTC1h 7m
2026-07-25 AAL1318 ORD → BOS Jul 25, 06:55 UTCJul 25, 07:50 UTC55m
2026-07-25 AAL2790 ORD → AUS Jul 25, 04:05 UTCJul 25, 05:30 UTC1h 25m
2026-07-25 AAL2790 ORD → AUS Jul 25, 00:05 UTCJul 25, 01:35 UTC1h 30m
2026-07-24 AAL973 - Jul 24, 16:30 UTCJul 24, 17:40 UTC1h 10m
2026-07-24 AAL973 CLT → PUJ Jul 24, 16:25 UTCJul 24, 19:31 UTC3h 6m
2026-07-24 AAL3187 LGA → DCA Jul 24, 13:30 UTCJul 24, 14:40 UTC1h 10m
2026-07-24 AAL3187 LGA → DCA Jul 24, 11:35 UTCJul 24, 11:50 UTC15m
2026-07-24 AAL702 DFW → SJU Jul 24, 04:15 UTCJul 24, 04:25 UTC10m
2026-07-24 AAL702 DFW → SJU Jul 24, 00:00 UTCJul 24, 02:40 UTC2h 40m
2026-07-23 AAL702 DFW → SJU Jul 23, 23:59 UTCJul 24, 04:24 UTC4h 25m
2026-07-23 AAL1629 ORD → CLT Jul 23, 19:55 UTCJul 23, 22:30 UTC2h 35m
2026-07-23 AAL1629 ORD → CLT Jul 23, 16:05 UTCJul 23, 18:45 UTC2h 40m
2026-07-23 AAL2172 MCO → DFW Jul 23, 12:35 UTCJul 23, 14:50 UTC2h 15m
2026-07-22 AAL2117 DCA → LGA Jul 22, 20:35 UTCJul 22, 22:50 UTC2h 15m
2026-07-22 AAL2904 SFO → DFW Jul 22, 15:25 UTCJul 22, 18:35 UTC3h 10m
2026-07-22 AAL1430 DFW → SFO Jul 22, 01:05 UTCJul 22, 04:15 UTC3h 10m
2026-07-21 AAL1973 - Jul 21, 19:00 UTCJul 21, 21:55 UTC2h 55m
2026-07-21 AAL1973 DFW → YYC Jul 21, 14:20 UTCJul 21, 17:35 UTC3h 15m
2026-07-21 AAL2975 MCO → DFW Jul 21, 10:40 UTCJul 21, 13:00 UTC2h 20m
2026-07-21 AAL3176 ORD → MCO Jul 21, 02:05 UTCJul 21, 04:10 UTC2h 5m
2026-07-20 AAL2474 DFW → ORD Jul 20, 22:00 UTCJul 21, 00:35 UTC2h 34m
2026-07-20 AAL2474 DFW → ORD Jul 20, 22:00 UTCJul 21, 00:24 UTC2h 24m
2026-07-20 AAL1120 - Jul 20, 18:50 UTCJul 20, 20:35 UTC1h 45m
2026-07-20 AAL2922 SEA → ORD Jul 20, 13:20 UTCJul 20, 16:55 UTC3h 35m
2026-07-20 AAL2003 DCA → LGA Jul 20, 01:45 UTCJul 20, 05:20 UTC3h 35m
2026-07-19 AAL2041 - Jul 19, 21:15 UTCJul 20, 00:00 UTC2h 45m
2026-07-19 AAL2041 - Jul 19, 17:15 UTCJul 19, 19:45 UTC2h 30m
2026-07-19 AAL2029 - Jul 19, 14:30 UTCJul 19, 15:40 UTC1h 10m
2026-07-19 AAL2029 ELP → DFW Jul 19, 14:17 UTCJul 19, 15:36 UTC1h 19m
2026-07-19 AAL841 ORD → DSM Jul 19, 01:40 UTCJul 19, 02:45 UTC1h 5m
2026-07-18 AAL2704 CLT → RDU Jul 18, 21:55 UTCJul 19, 00:10 UTC2h 15m
2026-07-18 AAL2704 CLT → RDU Jul 18, 18:30 UTCJul 18, 20:35 UTC2h 5m
2026-07-18 AAL2216 PDX → DFW Jul 18, 13:45 UTCJul 18, 17:10 UTC3h 25m
2026-07-18 AAL3112 SDF → ORD Jul 18, 01:45 UTCJul 18, 06:30 UTC4h 46m
2026-07-17 AAL2270 - Jul 17, 23:00 UTCJul 18, 00:19 UTC1h 20m
2026-07-17 AAL2270 - Jul 17, 19:35 UTCJul 17, 21:00 UTC1h 25m
2026-07-17 AAL1150 - Jul 17, 16:29 UTCJul 17, 17:55 UTC1h 25m
2026-07-17 AAL1150 - Jul 17, 13:35 UTCJul 17, 14:50 UTC1h 15m
2026-07-17 AAL1065 - Jul 17, 10:44 UTCJul 17, 11:39 UTC55m
2026-07-17 AAL1644 - Jul 17, 02:34 UTCJul 17, 03:25 UTC50m
2026-07-17 AAL1644 CLT → BNA Jul 17, 02:31 UTCJul 17, 03:19 UTC48m
2026-07-16 AAL2442 - Jul 16, 23:44 UTCJul 17, 01:09 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 N920US page for operator, model, and routing details .

Mode-S ACBFFD frequently asked

What is Mode-S code ACBFFD?
ACBFFD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N920US.
Where is Mode-S ACBFFD registered?
Mode-S code ACBFFD 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 ACBFFD broadcasting right now?
Yes. Mode-S ACBFFD is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACBFFD, octal 53137775, decimal 11,321,341.
What flights does ACBFFD operate?
Mode-S ACBFFD has broadcast 20 distinct callsigns, including AAL2127, AAL2003, AAL1415, AAL717, AAL2759.