Apparatus

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sensors Mode-S transponder

A25B3B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N251AF · PILATUS PC-24 · operated by CSMC HOLDINGS INC, CENTRAL MUTUAL INSURANCE CO, TARGA RESOURCES FINANCE CORP, BERGER ASSOCIATES REALTY LLC, CAMPBELL SUSAN M, AMICK FARMS LLC

Hex
A25B3B
Octal
50455473
Decimal
10,640,187
Country
US
Tail
N251AF
Type
PC24
No current signal · last broadcast 4d ago
Flights observed
202
Distinct callsigns
20
Country
US
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S A25B3B.

Country allocation

The ICAO 24-bit address A25B3B 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
CNS36 - 22 2026-07-20
CNS227 - 20 2026-06-12
CNS11 - 19 2026-07-06
N251AF - 13 2026-07-19
CNS712 - 11 2026-07-01
CNS181 - 11 2026-05-26
CNS328 - 9 2026-07-08
CNS117 - 9 2026-07-12
CNS94 - 8 2026-05-31
CNS888 - 7 2026-06-04
CNS3 - 7 2026-06-02
CNS145 - 7 2026-07-24
CNS1210 - 7 2026-05-21
CNS25 - 6 2026-06-08
CNS245 - 6 2026-07-26
CNS121 - 5 2026-05-06
CNS55 - 4 2026-07-07
CNS47 - 4 2026-06-25
CNS13 - 4 2026-07-22
CNS719 - 3 2026-04-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CNS245 - Jul 26, 21:00 UTCJul 26, 21:45 UTC45m
2026-07-26 CNS245 - Jul 26, 16:10 UTCJul 26, 19:30 UTC3h 20m
2026-07-26 CNS245 - Jul 26, 14:00 UTCJul 26, 14:45 UTC45m
2026-07-25 CNS245 - Jul 25, 20:05 UTCJul 25, 23:15 UTC3h 10m
2026-07-25 CNS245 - Jul 25, 18:40 UTCJul 25, 19:05 UTC25m
2026-07-25 CNS245 PSM → BED Jul 25, 16:20 UTCJul 25, 16:40 UTC20m
2026-07-25 CNS130 - Jul 25, 00:50 UTCJul 25, 01:15 UTC25m
2026-07-24 CNS130 - Jul 24, 23:45 UTCJul 25, 00:15 UTC30m
2026-07-24 CNS145 - Jul 24, 18:30 UTCJul 24, 18:40 UTC10m
2026-07-24 CNS145 - Jul 24, 17:15 UTCJul 24, 18:00 UTC45m
2026-07-24 CNS145 - Jul 24, 15:35 UTCJul 24, 16:05 UTC30m
2026-07-23 CNS145 - Jul 23, 18:40 UTCJul 23, 19:50 UTC1h 10m
2026-07-23 CNS145 - Jul 23, 16:15 UTCJul 23, 17:05 UTC50m
2026-07-23 CNS145 - Jul 23, 14:10 UTCJul 23, 14:40 UTC30m
2026-07-23 CNS145 - Jul 23, 11:35 UTCJul 23, 13:05 UTC1h 30m
2026-07-22 CNS12 - Jul 22, 21:25 UTCJul 22, 22:15 UTC50m
2026-07-22 CNS12 - Jul 22, 18:55 UTCJul 22, 20:15 UTC1h 20m
2026-07-22 CNS13 - Jul 22, 12:50 UTCJul 22, 13:55 UTC1h 5m
2026-07-20 CNS36 - Jul 20, 20:30 UTCJul 20, 21:15 UTC45m
2026-07-20 CNS36 - Jul 20, 17:55 UTCJul 20, 19:45 UTC1h 50m
2026-07-20 CNS36 - Jul 20, 17:05 UTCJul 20, 17:25 UTC20m
2026-07-20 CNS36 - Jul 20, 14:10 UTCJul 20, 15:35 UTC1h 25m
2026-07-19 CNS36 - Jul 19, 18:15 UTCJul 19, 20:35 UTC2h 20m
2026-07-19 N251AF YYZ → BUF Jul 19, 16:35 UTCJul 19, 17:05 UTC30m
2026-07-19 N251AF - Jul 19, 14:20 UTCJul 19, 15:55 UTC1h 35m
2026-07-18 CNS36 - Jul 18, 20:55 UTCJul 18, 22:15 UTC1h 20m
2026-07-18 CNS36 - Jul 18, 15:55 UTCJul 18, 18:50 UTC2h 55m
2026-07-16 N251AF - Jul 16, 18:34 UTCJul 16, 20:19 UTC1h 45m
2026-07-16 N251AF - Jul 16, 17:25 UTCJul 16, 17:40 UTC15m
2026-07-16 N251AF - Jul 16, 16:05 UTCJul 16, 16:40 UTC35m
2026-07-16 N251AF - Jul 16, 12:00 UTCJul 16, 13:49 UTC1h 50m
2026-07-15 CNS13 - Jul 15, 17:15 UTCJul 15, 19:20 UTC2h 5m
2026-07-15 CNS13 - Jul 15, 14:05 UTCJul 15, 16:05 UTC2h 0m
2026-07-15 CNS13 - Jul 15, 10:10 UTCJul 15, 11:55 UTC1h 45m
2026-07-14 CNS20 - Jul 14, 14:00 UTCJul 14, 14:10 UTC10m
2026-07-14 CNS20 PSM → CON Jul 14, 13:35 UTCJul 14, 13:50 UTC15m
2026-07-12 N251AF - Jul 12, 21:45 UTCJul 12, 22:40 UTC55m
2026-07-12 N251AF - Jul 12, 17:55 UTCJul 12, 20:25 UTC2h 30m
2026-07-12 CNS117 - Jul 12, 15:15 UTCJul 12, 16:40 UTC1h 25m
2026-07-11 CNS117 - Jul 11, 21:00 UTCJul 11, 22:30 UTC1h 30m
2026-07-11 CNS117 - Jul 11, 18:30 UTCJul 11, 20:20 UTC1h 50m
2026-07-11 CNS117 - Jul 11, 16:40 UTCJul 11, 17:15 UTC35m
2026-07-11 CNS117 - Jul 11, 15:05 UTCJul 11, 16:05 UTC1h 0m
2026-07-11 CNS117 - Jul 11, 14:05 UTCJul 11, 14:25 UTC20m
2026-07-10 CNS117 - Jul 10, 18:00 UTCJul 10, 18:30 UTC30m
2026-07-10 CNS117 - Jul 10, 15:25 UTCJul 10, 16:20 UTC55m
2026-07-10 CNS117 - Jul 10, 14:30 UTCJul 10, 14:50 UTC20m
2026-07-09 CNS1978 - Jul 9, 20:40 UTCJul 9, 21:50 UTC1h 10m
2026-07-09 CNS1978 - Jul 9, 17:55 UTCJul 9, 19:40 UTC1h 45m
2026-07-09 CNS1978 - Jul 9, 14:40 UTCJul 9, 16:45 UTC2h 5m

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 N251AF page for operator, model, and routing details .

Mode-S A25B3B frequently asked

What is Mode-S code A25B3B?
A25B3B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N251AF.
Where is Mode-S A25B3B registered?
Mode-S code A25B3B 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 A25B3B broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A25B3B, octal 50455473, decimal 10,640,187.
What flights does A25B3B operate?
Mode-S A25B3B has broadcast 20 distinct callsigns, including CNS36, CNS227, CNS11, N251AF, CNS712.