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 Jul 26, 22:45 UTC
Flights observed
174
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

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
ABX502 - 7 2026-07-16
ABX102 - 7 2026-07-17
ABX480 ABX Air 6 2026-06-01
ABX803 - 5 2026-07-11
ABX510 - 5 2026-07-08
ABX110 - 5 2026-07-09
ABX880 ABX Air 4 2026-06-10
ABX505 ABX Air 4 2026-05-19
ABX403 - 4 2026-07-12
ABX400 - 4 2026-07-03
ABX2332 - 4 2026-07-03
ABX2331 - 4 2026-07-03
ABX1395 - 4 2026-07-03
ABX105 ABX Air 4 2026-05-20
ABX902 - 3 2026-07-14
ABX901 - 3 2026-07-13
ABX583 ABX Air 3 2026-07-25
ABX2246 ABX Air 3 2026-07-25
ABX2245 ABX Air 3 2026-07-25
ABX2046 ABX Air 3 2026-04-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ABX183 MIA → CVG Jul 26, 21:50 UTCJul 26, 22:45 UTC55m
2026-07-25 ABX2246 CCS → MIA Jul 25, 21:40 UTCJul 26, 00:50 UTC3h 10m
2026-07-25 ABX2245 MIA → BOG Jul 25, 16:30 UTCJul 25, 19:25 UTC2h 55m
2026-07-25 ABX583 CVG → MIA Jul 25, 11:50 UTCJul 25, 13:50 UTC2h 0m
2026-07-25 ABX2021 YHM → CVG Jul 25, 03:15 UTCJul 25, 05:15 UTC2h 0m
2026-07-24 ABX2020 CVG → JFK Jul 24, 09:50 UTCJul 24, 11:55 UTC2h 5m
2026-07-24 ABX2023 JFK → CVG Jul 24, 03:40 UTCJul 24, 05:45 UTC2h 5m
2026-07-23 ABX2022 CVG → BOS Jul 23, 10:10 UTCJul 23, 12:15 UTC2h 5m
2026-07-22 ABX2031 CVG → JFK Jul 22, 03:20 UTCJul 22, 05:15 UTC1h 55m
2026-07-21 ABX2030 CVG → IAH Jul 21, 10:35 UTCJul 21, 12:00 UTC1h 25m
2026-07-17 ABX120 - Jul 17, 21:55 UTCJul 17, 23:50 UTC1h 55m
2026-07-17 ABX017 CVG → LAX Jul 17, 18:25 UTCJul 17, 20:20 UTC1h 55m
2026-07-17 ABX102 - Jul 17, 03:59 UTCJul 17, 05:45 UTC1h 45m
2026-07-16 ABX502 CVG → DFW Jul 16, 11:15 UTCJul 16, 13:05 UTC1h 50m
2026-07-16 ABX2029 MCO → CVG Jul 16, 03:15 UTCJul 16, 04:55 UTC1h 40m
2026-07-15 ABX2009 - Jul 15, 23:55 UTCJul 16, 01:35 UTC1h 40m
2026-07-14 ABX902 - Jul 14, 00:25 UTCJul 14, 04:30 UTC4h 5m
2026-07-13 ABX902 - Jul 13, 13:05 UTCJul 13, 21:10 UTC8h 5m
2026-07-13 ABX901 - Jul 13, 04:40 UTCJul 13, 06:40 UTC2h 0m
2026-07-12 ABX403 - Jul 12, 09:50 UTCJul 12, 13:30 UTC3h 40m
2026-07-11 ABX803 - Jul 11, 09:50 UTCJul 11, 13:55 UTC4h 5m
2026-07-11 ABX2021 AUS → CVG Jul 11, 03:35 UTCJul 11, 05:55 UTC2h 20m
2026-07-10 ABX2020 - Jul 10, 09:45 UTCJul 10, 12:05 UTC2h 20m
2026-07-09 ABX110 ATL → CVG Jul 9, 04:45 UTCJul 9, 05:45 UTC1h 0m
2026-07-08 ABX510 - Jul 8, 11:25 UTCJul 8, 12:30 UTC1h 5m
2026-07-08 ABX397 ORD → CVG Jul 8, 04:50 UTCJul 8, 05:40 UTC50m
2026-07-07 ABX797 - Jul 7, 11:20 UTCJul 7, 12:15 UTC55m
2026-07-07 ABX102 DFW → CVG Jul 7, 04:15 UTCJul 7, 06:00 UTC1h 45m
2026-07-06 ABX502 - Jul 6, 07:50 UTCJul 6, 09:45 UTC1h 55m
2026-07-04 ABX8705 - Jul 4, 12:15 UTCJul 4, 14:15 UTC2h 0m
2026-07-04 ABX304 SDF → MIA Jul 4, 08:50 UTCJul 4, 10:45 UTC1h 55m
2026-07-04 ABX1331 MIA → SDF Jul 4, 05:05 UTCJul 4, 07:05 UTC2h 0m
2026-07-03 ABX2332 - Jul 3, 20:30 UTCJul 3, 22:55 UTC2h 25m
2026-07-03 ABX2331 - Jul 3, 12:10 UTCJul 3, 14:05 UTC1h 55m
2026-07-03 ABX400 - Jul 3, 08:05 UTCJul 3, 10:00 UTC1h 55m
2026-07-03 ABX1395 - Jul 3, 02:05 UTCJul 3, 03:55 UTC1h 50m
2026-07-02 ABX2332 SDF → MIA Jul 2, 20:30 UTCJul 2, 22:35 UTC2h 5m
2026-07-02 ABX2331 MIA → SDF Jul 2, 12:45 UTCJul 2, 14:35 UTC1h 50m
2026-07-02 ABX400 - Jul 2, 07:45 UTCJul 2, 09:35 UTC1h 50m
2026-07-02 ABX1395 - Jul 2, 01:00 UTCJul 2, 02:50 UTC1h 50m
2026-07-01 ABX2332 SDF → MIA Jul 1, 20:35 UTCJul 1, 22:35 UTC2h 0m
2026-07-01 ABX2331 MIA → SDF Jul 1, 12:20 UTCJul 1, 14:10 UTC1h 50m
2026-07-01 ABX400 SDF → MIA Jul 1, 08:00 UTCJul 1, 09:50 UTC1h 50m
2026-07-01 ABX1395 MIA → SDF Jul 1, 00:50 UTCJul 1, 02:50 UTC2h 0m
2026-06-30 ABX2332 SDF → MIA Jun 30, 20:50 UTCJun 30, 23:00 UTC2h 10m
2026-06-30 ABX2331 MIA → SDF Jun 30, 12:50 UTCJun 30, 14:40 UTC1h 50m
2026-06-30 ABX400 SDF → MIA Jun 30, 07:45 UTCJun 30, 09:35 UTC1h 50m
2026-06-30 ABX1395 MIA → SDF Jun 30, 01:30 UTCJun 30, 03:30 UTC2h 0m
2026-06-29 ABX901 - Jun 29, 04:34 UTCJun 29, 06:34 UTC2h 0m
2026-06-27 ABX102 DFW → CVG Jun 27, 03:55 UTCJun 27, 05:35 UTC1h 40m

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 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 A1FB4B, octal 50375513, decimal 10,615,627.
What flights does A1FB4B operate?
Mode-S A1FB4B has broadcast 20 distinct callsigns, including ABX502, ABX102, ABX480, ABX803, ABX510.