Apparatus

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sensors Mode-S transponder

A256BF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N25SK · CESSNA 172 Skyhawk · operated by H & H AVIATION ENTEPRISES LLC

Hex
A256BF
Octal
50453277
Decimal
10,639,039
Country
US
Tail
N25SK
Type
C172
No current signal · last broadcast 20h ago
Flights observed
273
Distinct callsigns
1
Country
US
Last broadcast
20h ago

Last known position

Most recent position reported by Mode-S A256BF.

Country allocation

The ICAO 24-bit address A256BF 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
N25SK - 273 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 N25SK - Jul 17, 18:29 UTCJul 17, 18:55 UTC25m
2026-07-17 N25SK - Jul 17, 13:50 UTCJul 17, 14:30 UTC40m
2026-07-16 N25SK - Jul 16, 19:20 UTCJul 16, 21:00 UTC1h 40m
2026-07-16 N25SK HAO → HAO Jul 16, 17:14 UTCJul 16, 18:19 UTC1h 5m
2026-07-15 N25SK - Jul 15, 22:55 UTCJul 15, 23:40 UTC45m
2026-07-15 N25SK - Jul 15, 20:25 UTCJul 15, 21:45 UTC1h 20m
2026-07-15 N25SK - Jul 15, 18:40 UTCJul 15, 19:00 UTC20m
2026-07-15 N25SK - Jul 15, 16:40 UTCJul 15, 16:55 UTC15m
2026-07-15 N25SK - Jul 15, 14:35 UTCJul 15, 16:05 UTC1h 30m
2026-07-14 N25SK - Jul 14, 22:35 UTCJul 15, 00:00 UTC1h 24m
2026-07-14 N25SK HAO → HAO Jul 14, 20:35 UTCJul 14, 22:00 UTC1h 25m
2026-07-14 N25SK - Jul 14, 18:45 UTCJul 14, 19:45 UTC1h 0m
2026-07-14 N25SK - Jul 14, 14:00 UTCJul 14, 15:35 UTC1h 35m
2026-07-13 N25SK - Jul 13, 23:40 UTCJul 14, 01:15 UTC1h 35m
2026-07-13 N25SK HAO → HAO Jul 13, 22:00 UTCJul 13, 22:45 UTC45m
2026-07-13 N25SK - Jul 13, 20:15 UTCJul 13, 21:20 UTC1h 5m
2026-07-13 N25SK HAO → HAO Jul 13, 15:55 UTCJul 13, 17:20 UTC1h 25m
2026-07-13 N25SK - Jul 13, 14:10 UTCJul 13, 15:00 UTC50m
2026-07-13 N25SK HAO → HAO Jul 13, 01:35 UTCJul 13, 02:40 UTC1h 5m
2026-07-12 N25SK - Jul 12, 22:25 UTCJul 12, 23:10 UTC45m
2026-07-12 N25SK - Jul 12, 21:25 UTCJul 12, 21:40 UTC15m
2026-07-12 N25SK - Jul 12, 19:50 UTCJul 12, 20:50 UTC1h 0m
2026-07-12 N25SK HAO → OXD Jul 12, 15:15 UTCJul 12, 15:30 UTC15m
2026-07-10 N25SK HAO → HAO Jul 10, 22:55 UTCJul 10, 23:05 UTC10m
2026-07-10 N25SK - Jul 10, 20:45 UTCJul 10, 21:30 UTC45m
2026-07-10 N25SK HAO → HAO Jul 10, 16:35 UTCJul 10, 17:00 UTC25m
2026-07-09 N25SK - Jul 9, 22:45 UTCJul 9, 23:55 UTC1h 10m
2026-07-09 N25SK - Jul 9, 20:35 UTCJul 9, 21:45 UTC1h 10m
2026-07-09 N25SK - Jul 9, 17:40 UTCJul 9, 18:40 UTC1h 0m
2026-07-09 N25SK - Jul 9, 13:35 UTCJul 9, 14:45 UTC1h 10m
2026-07-08 N25SK - Jul 8, 19:50 UTCJul 8, 20:45 UTC55m
2026-07-08 N25SK - Jul 8, 18:15 UTCJul 8, 19:10 UTC55m
2026-07-08 N25SK - Jul 8, 14:35 UTCJul 8, 15:30 UTC55m
2026-07-07 N25SK - Jul 7, 21:30 UTCJul 7, 22:35 UTC1h 5m
2026-07-07 N25SK - Jul 7, 19:15 UTCJul 7, 20:15 UTC1h 0m
2026-07-07 N25SK HAO → HAO Jul 7, 16:35 UTCJul 7, 17:40 UTC1h 5m
2026-07-07 N25SK - Jul 7, 13:50 UTCJul 7, 14:55 UTC1h 5m
2026-07-06 N25SK - Jul 6, 22:40 UTCJul 6, 23:35 UTC55m
2026-07-06 N25SK - Jul 6, 17:55 UTCJul 6, 18:10 UTC15m
2026-07-06 N25SK - Jul 6, 17:05 UTCJul 6, 17:15 UTC10m
2026-07-03 N25SK HAO → HAO Jul 3, 12:35 UTCJul 3, 13:35 UTC1h 0m
2026-07-03 N25SK - Jul 3, 00:10 UTCJul 3, 01:00 UTC50m
2026-07-02 N25SK HAO → HAO Jul 2, 20:25 UTCJul 2, 21:00 UTC35m
2026-07-02 N25SK HAO → HAO Jul 2, 17:30 UTCJul 2, 18:30 UTC1h 0m
2026-07-02 N25SK HAO → HAO Jul 2, 14:15 UTCJul 2, 14:35 UTC20m
2026-07-02 N25SK HAO → HAO Jul 2, 11:50 UTCJul 2, 12:15 UTC25m
2026-07-01 N25SK - Jul 1, 20:35 UTCJul 1, 21:40 UTC1h 5m
2026-07-01 N25SK - Jul 1, 16:45 UTCJul 1, 18:25 UTC1h 40m
2026-07-01 N25SK HAO → HAO Jul 1, 14:45 UTCJul 1, 15:45 UTC1h 0m
2026-07-01 N25SK HAO → HAO Jul 1, 01:15 UTCJul 1, 02:05 UTC50m

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 N25SK page for operator, model, and routing details .

Mode-S A256BF frequently asked

What is Mode-S code A256BF?
A256BF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N25SK.
Where is Mode-S A256BF registered?
Mode-S code A256BF 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 A256BF broadcasting right now?
No active broadcast right now. Last signal was 20h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A256BF, octal 50453277, decimal 10,639,039.
What flights does A256BF operate?
Mode-S A256BF has broadcast 1 distinct callsign, including N25SK.