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sensors Mode-S transponder

A25CCB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N251SF · operated by TEXTRON AVIATION INC

Hex
A25CCB
Octal
50456313
Decimal
10,640,587
Country
US
Tail
N251SF
No current signal · last broadcast Jul 23, 03:10 UTC
Flights observed
221
Distinct callsigns
1
Country
US
Last broadcast
Jul 23, 03:10 UTC

Last known position

Most recent position reported by Mode-S A25CCB.

Country allocation

The ICAO 24-bit address A25CCB 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 1 distinct

Callsign Airline Flights Last seen
N251SF - 221 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 N251SF - Jul 23, 02:10 UTCJul 23, 03:10 UTC1h 0m
2026-07-23 N251SF - Jul 23, 00:20 UTCJul 23, 00:35 UTC15m
2026-07-22 N251SF - Jul 22, 22:35 UTCJul 22, 23:05 UTC30m
2026-07-22 N251SF - Jul 22, 17:20 UTCJul 22, 18:55 UTC1h 35m
2026-07-22 N251SF - Jul 22, 12:25 UTCJul 22, 13:35 UTC1h 10m
2026-07-22 N251SF - Jul 22, 03:25 UTCJul 22, 03:40 UTC15m
2026-07-22 N251SF - Jul 22, 01:40 UTCJul 22, 02:40 UTC1h 0m
2026-07-21 N251SF - Jul 21, 22:15 UTCJul 21, 23:10 UTC55m
2026-07-21 N251SF - Jul 21, 18:35 UTCJul 21, 20:05 UTC1h 30m
2026-07-21 N251SF - Jul 21, 16:00 UTCJul 21, 17:10 UTC1h 10m
2026-07-21 N251SF - Jul 21, 12:20 UTCJul 21, 13:45 UTC1h 25m
2026-07-20 N251SF - Jul 20, 20:40 UTCJul 20, 21:40 UTC1h 0m
2026-07-20 N251SF - Jul 20, 16:00 UTCJul 20, 16:40 UTC40m
2026-07-20 N251SF PWK → DPA Jul 20, 02:25 UTCJul 20, 02:55 UTC30m
2026-07-20 N251SF DPA → PWK Jul 20, 00:45 UTCJul 20, 01:40 UTC55m
2026-07-19 N251SF - Jul 19, 17:35 UTCJul 19, 18:15 UTC40m
2026-07-19 N251SF - Jul 19, 15:20 UTCJul 19, 16:30 UTC1h 10m
2026-07-18 N251SF - Jul 18, 22:55 UTCJul 19, 00:05 UTC1h 10m
2026-07-18 N251SF - Jul 18, 18:30 UTCJul 18, 19:20 UTC50m
2026-07-18 N251SF - Jul 18, 13:35 UTCJul 18, 15:50 UTC2h 15m
2026-07-16 N251SF - Jul 16, 18:10 UTCJul 16, 18:44 UTC35m
2026-07-16 N251SF DPA → DPA Jul 16, 15:35 UTCJul 16, 17:00 UTC1h 25m
2026-07-15 N251SF - Jul 15, 22:20 UTCJul 16, 00:20 UTC2h 0m
2026-07-15 N251SF - Jul 15, 20:25 UTCJul 15, 21:10 UTC45m
2026-07-15 N251SF - Jul 15, 17:50 UTCJul 15, 19:00 UTC1h 10m
2026-07-15 N251SF - Jul 15, 15:50 UTCJul 15, 16:50 UTC1h 0m
2026-07-15 N251SF - Jul 15, 14:25 UTCJul 15, 14:45 UTC20m
2026-07-14 N251SF - Jul 14, 20:30 UTCJul 14, 22:05 UTC1h 35m
2026-07-14 N251SF DPA → DPA Jul 14, 16:15 UTCJul 14, 17:15 UTC1h 0m
2026-07-14 N251SF - Jul 14, 13:55 UTCJul 14, 15:00 UTC1h 5m
2026-07-14 N251SF - Jul 14, 02:50 UTCJul 14, 04:55 UTC2h 5m
2026-07-13 N251SF DPA → DPA Jul 13, 21:00 UTCJul 13, 22:25 UTC1h 25m
2026-07-13 N251SF - Jul 13, 18:45 UTCJul 13, 19:20 UTC35m
2026-07-13 N251SF - Jul 13, 16:25 UTCJul 13, 17:00 UTC35m
2026-07-13 N251SF - Jul 13, 15:20 UTCJul 13, 15:50 UTC30m
2026-07-13 N251SF DPA → DPA Jul 13, 12:30 UTCJul 13, 13:35 UTC1h 5m
2026-07-13 N251SF - Jul 13, 00:50 UTCJul 13, 02:50 UTC2h 0m
2026-07-12 N251SF - Jul 12, 19:35 UTCJul 12, 22:00 UTC2h 25m
2026-07-12 N251SF DPA → DPA Jul 12, 01:25 UTCJul 12, 04:05 UTC2h 40m
2026-07-11 N251SF - Jul 11, 22:30 UTCJul 11, 23:20 UTC50m
2026-07-11 N251SF - Jul 11, 18:40 UTCJul 11, 20:10 UTC1h 30m
2026-07-10 N251SF - Jul 10, 19:35 UTCJul 10, 20:00 UTC25m
2026-07-10 N251SF - Jul 10, 16:15 UTCJul 10, 16:40 UTC25m
2026-07-10 N251SF - Jul 10, 14:45 UTCJul 10, 15:40 UTC55m
2026-07-10 N251SF - Jul 10, 00:15 UTCJul 10, 02:00 UTC1h 45m
2026-07-09 N251SF - Jul 9, 20:45 UTCJul 9, 22:45 UTC2h 0m
2026-07-09 N251SF - Jul 9, 19:50 UTCJul 9, 20:00 UTC10m
2026-07-09 N251SF - Jul 9, 15:40 UTCJul 9, 18:40 UTC3h 0m
2026-07-08 N251SF - Jul 8, 21:50 UTCJul 8, 22:45 UTC55m
2026-07-08 N251SF - Jul 8, 18:00 UTCJul 8, 19:15 UTC1h 15m

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 N251SF page for operator, model, and routing details .

Mode-S A25CCB frequently asked

What is Mode-S code A25CCB?
A25CCB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N251SF.
Where is Mode-S A25CCB registered?
Mode-S code A25CCB 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 A25CCB broadcasting right now?
No active broadcast right now. Last signal was Jul 23, 03:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A25CCB, octal 50456313, decimal 10,640,587.
What flights does A25CCB operate?
Mode-S A25CCB has broadcast 1 distinct callsign, including N251SF.