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
Transponder active on ground
Flights observed
425
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S ACBFFD.

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
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
AAL2003 - 5 2026-06-18
AAL1043 American Airlines 5 2026-06-14
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
AAL2305 - 4 2026-06-17
AAL2286 - 4 2026-07-07
AAL2117 - 4 2026-07-14
AAL1886 - 4 2026-07-12
AAL1455 - 4 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 AAL2117 - Jul 14, 00:15 UTCJul 14, 01:15 UTC1h 0m
2026-07-13 AAL2117 DFW → MCO Jul 13, 20:45 UTCJul 13, 22:55 UTC2h 10m
2026-07-13 AAL2216 PDX → DFW Jul 13, 15:40 UTCJul 13, 19:05 UTC3h 25m
2026-07-13 AAL2283 DFW → PDX Jul 13, 05:31 UTCJul 13, 08:45 UTC3h 15m
2026-07-12 AAL2143 MCO → DFW Jul 12, 23:34 UTCJul 13, 03:05 UTC3h 31m
2026-07-12 AAL2143 MCO → DFW Jul 12, 23:35 UTCJul 13, 03:05 UTC3h 30m
2026-07-12 AAL3271 - Jul 12, 20:30 UTCJul 12, 21:55 UTC1h 25m
2026-07-12 AAL1886 - Jul 12, 13:45 UTCJul 12, 15:55 UTC2h 10m
2026-07-12 AAL2707 DFW → AUS Jul 12, 02:15 UTCJul 12, 02:50 UTC35m
2026-07-11 AAL717 - Jul 11, 21:45 UTCJul 12, 01:00 UTC3h 15m
2026-07-11 AAL717 DFW → SEA Jul 11, 16:40 UTCJul 11, 20:15 UTC3h 35m
2026-07-11 AAL977 - Jul 11, 11:20 UTCJul 11, 14:20 UTC3h 0m
2026-07-11 AAL2469 - Jul 11, 01:00 UTCJul 11, 03:30 UTC2h 30m
2026-07-10 AAL1415 - Jul 10, 19:00 UTCJul 10, 22:35 UTC3h 36m
2026-07-10 AAL1415 DFW → YVR Jul 10, 13:40 UTCJul 10, 17:20 UTC3h 40m
2026-07-10 AAL3281 - Jul 10, 09:15 UTCJul 10, 12:05 UTC2h 50m
2026-07-10 AAL3281 SFO → DFW Jul 10, 09:11 UTCJul 10, 12:00 UTC2h 49m
2026-07-10 AAL2430 DFW → SFO Jul 10, 04:45 UTCJul 10, 08:05 UTC3h 20m
2026-07-09 AAL3104 - Jul 9, 23:50 UTCJul 10, 02:30 UTC2h 40m
2026-07-09 AAL674 MDT → DFW Jul 9, 20:50 UTCJul 9, 21:20 UTC30m
2026-07-09 AAL674 MDT → DFW Jul 9, 18:55 UTCJul 9, 19:05 UTC10m
2026-07-09 AAL674 MDT → DFW Jul 9, 18:44 UTCJul 9, 21:20 UTC2h 36m
2026-07-09 AAL2857 - Jul 9, 17:05 UTCJul 9, 17:20 UTC15m
2026-07-09 AAL2857 - Jul 9, 15:05 UTCJul 9, 15:30 UTC25m
2026-07-09 AAL1249 LGA → MIA Jul 9, 10:10 UTCJul 9, 12:40 UTC2h 30m
2026-07-09 AAL3128 HWO → LGA Jul 9, 00:15 UTCJul 9, 03:30 UTC3h 15m
2026-07-08 AAL3117 - Jul 8, 20:15 UTCJul 8, 21:15 UTC1h 0m
2026-07-08 AAL3117 - Jul 8, 18:50 UTCJul 8, 20:10 UTC1h 20m
2026-07-08 AAL1099 YVR → DFW Jul 8, 13:15 UTCJul 8, 16:40 UTC3h 25m
2026-07-08 AAL2373 - Jul 8, 01:50 UTCJul 8, 05:35 UTC3h 45m
2026-07-07 AAL2286 - Jul 7, 20:40 UTCJul 8, 00:00 UTC3h 20m
2026-07-07 AAL2286 DFW → PDX Jul 7, 16:00 UTCJul 7, 19:25 UTC3h 25m
2026-07-07 AAL2274 ORF → DFW Jul 7, 11:25 UTCJul 7, 14:20 UTC2h 55m
2026-07-07 AAL2274 ORF → DFW Jul 7, 11:24 UTCJul 7, 14:09 UTC2h 45m
2026-07-07 AAL2587 DFW → ORF Jul 7, 01:25 UTCJul 7, 04:00 UTC2h 35m
2026-07-06 AAL2767 TPA → DFW Jul 6, 21:20 UTCJul 6, 23:30 UTC2h 10m
2026-07-06 AAL2767 TPA → DFW Jul 6, 21:17 UTCJul 6, 23:28 UTC2h 11m
2026-07-06 AAL2767 - Jul 6, 17:55 UTCJul 6, 20:10 UTC2h 15m
2026-07-06 AAL2811 LAX → DFW Jul 6, 13:20 UTCJul 6, 15:55 UTC2h 35m
2026-07-06 AAL1205 DFW → AUS Jul 6, 02:05 UTCJul 6, 06:40 UTC4h 35m
2026-07-05 AAL1024 - Jul 5, 19:25 UTCJul 6, 00:15 UTC4h 50m
2026-07-05 AAL1943 - Jul 5, 15:20 UTCJul 5, 16:50 UTC1h 30m
2026-07-05 AAL1943 - Jul 5, 12:15 UTCJul 5, 14:45 UTC2h 30m
2026-07-04 AAL2371 - Jul 4, 17:25 UTCJul 4, 19:50 UTC2h 25m
2026-07-04 AAL1745 BOS → MIA Jul 4, 12:15 UTCJul 4, 15:20 UTC3h 5m
2026-07-03 AAL1755 CLT → DTW Jul 3, 17:45 UTCJul 3, 21:05 UTC3h 20m
2026-07-03 AAL1755 CLT → DTW Jul 3, 17:44 UTCJul 3, 21:01 UTC3h 17m
2026-07-03 AAL1227 - Jul 3, 13:10 UTCJul 3, 15:50 UTC2h 40m
2026-07-03 AAL1227 MIA → DFW Jul 3, 13:07 UTCJul 3, 15:37 UTC2h 30m
2026-07-03 AAL1178 DCA → MIA Jul 3, 09:20 UTCJul 3, 11:20 UTC2h 0m

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?
Mode-S ACBFFD is currently broadcasting from the ground.
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, AAL1415, AAL717, AAL2759, AAL2708.