Apparatus

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sensors Mode-S transponder

A1FB4B

ICAO 24-bit transponder address · allocated to United States

Hex
A1FB4B
Octal
50375513
Decimal
10,615,627
Country
US
No current signal · last broadcast 1d ago
Flights observed
77
Distinct callsigns
20
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A1FB4B.

Country allocation

The ICAO 24-bit address A1FB4B 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
ABX505 ABX Air 4 2026-05-19
ABX480 ABX Air 4 2026-05-28
ABX105 ABX Air 4 2026-05-20
ABX803 ABX Air 3 2026-05-28
ABX2046 ABX Air 3 2026-04-15
ABX583 ABX Air 2 2026-04-15
ABX520 ABX Air 2 2026-05-20
ABX2246 ABX Air 2 2026-04-16
ABX2245 - 2 2026-04-15
ABX2047 - 2 2026-04-14
ABX152 ABX Air 2 2026-05-29
ABX120 ABX Air 2 2026-05-21
ABX051 ABX Air 2 2026-04-17
ABX902 ABX Air 1 2026-05-14
ABX901 ABX Air 1 2026-05-14
ABX880 ABX Air 1 2026-05-05
ABX845 ABX Air 1 2026-05-11
ABX510 ABX Air 1 2026-04-13
ABX445 ABX Air 1 2026-05-12
ABX403 ABX Air 1 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 ABX152 JFK → CVG May 29, 03:55 UTCMay 29, 05:20 UTC1h 25m
2026-05-28 ABX480 CVG → JFK May 28, 22:40 UTCMay 29, 00:20 UTC1h 40m
2026-05-28 ABX480 CVG → JFK May 28, 16:45 UTCMay 28, 20:20 UTC3h 35m
2026-05-28 ABX803 CVG → LAX May 28, 10:30 UTCMay 28, 14:35 UTC4h 5m
2026-05-25 ABX803 CVG → LAX May 25, 09:40 UTCMay 25, 10:10 UTC30m
2026-05-22 ABX2021 YHM → CVG May 22, 04:20 UTCMay 22, 05:20 UTC1h 0m
2026-05-21 ABX2020 CVG → JFK May 21, 11:25 UTCMay 21, 12:20 UTC55m
2026-05-21 ABX120 IAH → CVG May 21, 03:25 UTCMay 21, 05:05 UTC1h 40m
2026-05-21 ABX120 IAH → CVG May 21, 01:35 UTCMay 21, 02:10 UTC35m
2026-05-20 ABX520 CVG → IAH May 20, 15:40 UTCMay 20, 16:20 UTC40m
2026-05-20 ABX520 CVG → IAH May 20, 12:15 UTCMay 20, 14:20 UTC2h 5m
2026-05-20 ABX105 PHX → CVG May 20, 03:50 UTCMay 20, 06:55 UTC3h 6m
2026-05-20 ABX105 PHX → CVG May 20, 00:40 UTCMay 20, 01:40 UTC1h 0m
2026-05-19 ABX505 CVG → PHX May 19, 16:30 UTCMay 19, 17:30 UTC1h 0m
2026-05-19 ABX505 CVG → PHX May 19, 10:55 UTCMay 19, 14:30 UTC3h 35m
2026-05-14 ABX902 MIA → CVG May 14, 13:40 UTCMay 15, 04:00 UTC14h 20m
2026-05-14 ABX901 MIA → PTY May 14, 09:10 UTCMay 14, 11:15 UTC2h 5m
2026-05-13 ABX2176 MIA → CVG May 13, 07:50 UTCMay 13, 11:30 UTC3h 40m
2026-05-13 ABX1820 SFO → LAX May 13, 04:45 UTCMay 13, 05:50 UTC1h 5m
2026-05-12 ABX1920 LAX → SFO May 12, 20:10 UTCMay 12, 20:55 UTC45m
2026-05-12 ABX016 IAH → SEA May 12, 14:05 UTCMay 12, 18:15 UTC4h 10m
2026-05-12 ABX445 SJU → CVG May 12, 03:45 UTCMay 12, 05:35 UTC1h 50m
2026-05-11 ABX845 CVG → SJU May 11, 04:35 UTCMay 11, 08:05 UTC3h 30m
2026-05-08 ABX152 JFK → CVG May 8, 03:39 UTCMay 8, 05:24 UTC1h 45m
2026-05-07 ABX480 CVG → JFK May 7, 22:40 UTCMay 8, 00:05 UTC1h 25m
2026-05-07 ABX480 CVG → JFK May 7, 16:50 UTCMay 7, 20:20 UTC3h 30m
2026-05-07 ABX803 CVG → LAX May 7, 10:50 UTCMay 7, 14:55 UTC4h 5m
2026-05-07 ABX2043 GSO → CVG May 7, 04:45 UTCMay 7, 05:40 UTC55m
2026-05-07 ABX2010 CVG → PHL May 7, 00:25 UTCMay 7, 01:35 UTC1h 10m
2026-05-06 ABX2049 ROC → CVG May 6, 18:25 UTCMay 6, 20:15 UTC1h 50m
2026-05-06 ABX2000 CVG → EWR May 6, 12:35 UTCMay 6, 15:20 UTC2h 45m
2026-05-06 ABX403 LAX → CVG May 6, 03:25 UTCMay 6, 06:40 UTC3h 15m
2026-05-05 ABX880 JFK → CVG May 5, 19:20 UTCMay 5, 23:40 UTC4h 20m
2026-05-05 ABX105 PHX → CVG May 5, 03:50 UTCMay 5, 06:35 UTC2h 45m
2026-05-05 ABX105 PHX → CVG May 5, 00:35 UTCMay 5, 01:50 UTC1h 15m
2026-05-04 ABX505 CVG → PHX May 4, 10:10 UTCMay 4, 11:10 UTC1h 0m
2026-05-04 ABX505 CVG → PHX May 4, 04:34 UTCMay 4, 08:25 UTC3h 50m
2026-05-02 ABX090 NGU → CVG May 2, 04:00 UTCMay 2, 06:00 UTC2h 0m
2026-04-30 ABX039 MIA → MDE Apr 30, 21:35 UTCMay 1, 06:55 UTC9h 20m
2026-04-30 ABX037 CVG → TPA Apr 30, 10:05 UTCApr 30, 19:05 UTC9h 0m
2026-04-29 ABX035 MIA → UIO Apr 29, 22:35 UTCApr 30, 07:40 UTC9h 4m
2026-04-29 ABX033 MIA → UIO Apr 29, 10:40 UTCApr 29, 20:50 UTC10h 10m
2026-04-28 ABX031 MIA → UIO Apr 28, 19:35 UTCApr 29, 05:20 UTC9h 45m
2026-04-28 ABX030 CVG → ILN Apr 28, 16:40 UTCApr 28, 17:00 UTC20m
2026-04-28 ABX029 MIA → UIO Apr 28, 08:20 UTCApr 28, 15:20 UTC7h 0m
2026-04-27 ABX028 UIO → MIA Apr 27, 20:00 UTCApr 28, 04:40 UTC8h 40m
2026-04-27 ABX025 MIA → UIO Apr 27, 05:05 UTCApr 27, 14:00 UTC8h 55m
2026-04-26 ABX009 - Apr 26, 15:40 UTCApr 27, 00:55 UTC9h 15m
2026-04-26 ABX075 MIA → UIO Apr 26, 01:40 UTCApr 26, 14:00 UTC12h 20m
2026-04-25 ABX021 MIA → UIO Apr 25, 14:35 UTCApr 26, 00:00 UTC9h 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.

Mode-S A1FB4B frequently asked

What is Mode-S code A1FB4B?
A1FB4B is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S A1FB4B registered?
Mode-S code A1FB4B 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 A1FB4B broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1FB4B, octal 50375513, decimal 10,615,627.
What flights does A1FB4B operate?
Mode-S A1FB4B has broadcast 20 distinct callsigns, including ABX505, ABX480, ABX105, ABX803, ABX2046.