Apparatus

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sensors Mode-S transponder

ABFEFD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N872NN · BOEING 737-800 · operated by BANK OF UTAH TRUSTEE

Hex
ABFEFD
Octal
52777375
Decimal
11,271,933
Country
US
Tail
N872NN
Type
B738
Broadcasting now · callsign AAL2424 · 36,000 ft
Flights observed
27
Distinct callsigns
13
Country
US
Last broadcast
18m ago

Current position

ABFEFD is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address ABFEFD 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 13 distinct

Callsign Airline Flights Last seen
AAL486 - 4 2026-04-17
AAL2348 American Airlines 4 2026-04-15
AAL471 American Airlines 2 2026-04-17
AAL3307 - 2 2026-04-16
AAL2784 American Airlines 2 2026-04-18
AAL2294 American Airlines 2 2026-04-16
AAL1874 American Airlines 2 2026-04-17
AAL1606 - 2 2026-04-16
AAL1041 American Airlines 2 2026-04-16
AAL1040 American Airlines 2 2026-04-17
AAL624 American Airlines 1 2026-04-18
AAL3091 - 1 2026-04-18
AAL2424 American Airlines 1 2026-04-18

Recent flights last 27

DateFlightRouteTakeoffLandingDuration
2026-04-18 AAL2424 SAN → PHL Apr 18, 16:55 UTCApr 18, 17:15 UTC20m
2026-04-18 AAL3091 - Apr 18, 14:00 UTCApr 18, 15:35 UTC1h 35m
2026-04-18 AAL624 PHL → PHX Apr 18, 10:00 UTCApr 18, 11:45 UTC1h 45m
2026-04-18 AAL2784 DCA → ORD Apr 18, 05:25 UTCApr 18, 06:40 UTC1h 15m
2026-04-18 AAL2784 DCA → ORD Apr 18, 04:44 UTCApr 18, 06:36 UTC1h 52m
2026-04-17 AAL1040 TUL → DFW Apr 17, 23:25 UTCApr 18, 00:50 UTC1h 25m
2026-04-17 AAL1040 TUL → DFW Apr 17, 22:40 UTCApr 17, 23:20 UTC40m
2026-04-17 AAL486 - Apr 17, 19:25 UTCApr 17, 21:10 UTC1h 45m
2026-04-17 AAL486 - Apr 17, 18:30 UTCApr 17, 19:20 UTC50m
2026-04-17 AAL486 - Apr 17, 15:20 UTCApr 17, 16:45 UTC1h 25m
2026-04-17 AAL486 - Apr 17, 14:05 UTCApr 17, 15:15 UTC1h 9m
2026-04-17 AAL1874 PHL → BOS Apr 17, 03:20 UTCApr 17, 03:45 UTC25m
2026-04-17 AAL1874 PHL → BOS Apr 17, 02:49 UTCApr 17, 03:45 UTC56m
2026-04-17 AAL471 CLT → BOS Apr 17, 01:20 UTCApr 17, 01:30 UTC10m
2026-04-16 AAL471 CLT → BOS Apr 16, 23:59 UTCApr 17, 01:29 UTC1h 30m
2026-04-16 AAL3307 - Apr 16, 21:14 UTCApr 16, 22:15 UTC1h 0m
2026-04-16 AAL3307 DCA → ORD Apr 16, 20:13 UTCApr 16, 22:00 UTC1h 47m
2026-04-16 AAL1606 - Apr 16, 17:15 UTCApr 16, 18:15 UTC1h 0m
2026-04-16 AAL1606 MIA → DCA Apr 16, 16:08 UTCApr 16, 18:15 UTC2h 7m
2026-04-16 AAL2294 SEA → PHL Apr 16, 13:15 UTCApr 16, 14:55 UTC1h 40m
2026-04-16 AAL2294 SEA → PHL Apr 16, 12:39 UTCApr 16, 13:05 UTC25m
2026-04-16 AAL1041 PHL → LAX Apr 16, 01:10 UTCApr 16, 02:15 UTC1h 5m
2026-04-15 AAL1041 PHL → LAX Apr 15, 23:49 UTCApr 16, 02:13 UTC2h 24m
2026-04-15 AAL2348 LAS → DCA Apr 15, 21:05 UTCApr 15, 21:50 UTC45m
2026-04-15 AAL2348 LAS → DCA Apr 15, 20:40 UTCApr 15, 21:49 UTC1h 9m
2026-04-15 AAL2348 LAS → DCA Apr 15, 19:05 UTCApr 15, 19:25 UTC20m
2026-04-15 AAL2348 LAS → DCA Apr 15, 18:05 UTCApr 15, 19:00 UTC55m

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 N872NN page for operator, model, and routing details .

Mode-S ABFEFD frequently asked

What is Mode-S code ABFEFD?
ABFEFD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N872NN.
Where is Mode-S ABFEFD registered?
Mode-S code ABFEFD 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 ABFEFD broadcasting right now?
Yes. Mode-S ABFEFD is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABFEFD, octal 52777375, decimal 11,271,933.
What flights does ABFEFD operate?
Mode-S ABFEFD has broadcast 13 distinct callsigns, including AAL486, AAL2348, AAL471, AAL3307, AAL2784.