Apparatus

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sensors Mode-S transponder

A25F51

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N252EA · operated by MESA PILOT DEVELOPMENT LLC

Hex
A25F51
Octal
50457521
Decimal
10,641,233
Country
US
Tail
N252EA
Type
PIAT
No current signal · last broadcast 13h ago
Flights observed
39
Distinct callsigns
1
Country
US
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S A25F51.

Country allocation

The ICAO 24-bit address A25F51 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
N252EA - 39 2026-04-18

Recent flights last 39

DateFlightRouteTakeoffLandingDuration
2026-04-18 N252EA - Apr 18, 03:40 UTCApr 18, 04:00 UTC20m
2026-04-17 N252EA - Apr 17, 23:25 UTCApr 18, 01:15 UTC1h 50m
2026-04-17 N252EA - Apr 17, 21:25 UTCApr 17, 23:20 UTC1h 55m
2026-04-17 N252EA - Apr 17, 19:25 UTCApr 17, 21:20 UTC1h 55m
2026-04-17 N252EA - Apr 17, 17:25 UTCApr 17, 19:20 UTC1h 55m
2026-04-17 N252EA - Apr 17, 16:45 UTCApr 17, 17:15 UTC30m
2026-04-17 N252EA - Apr 17, 15:20 UTCApr 17, 16:15 UTC55m
2026-04-17 N252EA - Apr 17, 13:20 UTCApr 17, 15:00 UTC1h 39m
2026-04-17 N252EA - Apr 17, 11:45 UTCApr 17, 13:15 UTC1h 30m
2026-04-17 N252EA - Apr 17, 09:20 UTCApr 17, 10:30 UTC1h 10m
2026-04-17 N252EA - Apr 17, 08:10 UTCApr 17, 09:15 UTC1h 5m
2026-04-17 N252EA - Apr 17, 07:20 UTCApr 17, 08:05 UTC45m
2026-04-17 N252EA - Apr 17, 05:20 UTCApr 17, 07:15 UTC1h 55m
2026-04-17 N252EA - Apr 17, 03:40 UTCApr 17, 05:05 UTC1h 26m
2026-04-17 N252EA - Apr 17, 02:00 UTCApr 17, 03:10 UTC1h 10m
2026-04-17 N252EA - Apr 17, 01:20 UTCApr 17, 01:55 UTC35m
2026-04-16 N252EA - Apr 16, 23:20 UTCApr 17, 01:15 UTC1h 55m
2026-04-16 N252EA - Apr 16, 09:10 UTCApr 16, 10:25 UTC1h 15m
2026-04-16 N252EA - Apr 16, 08:15 UTCApr 16, 09:05 UTC50m
2026-04-16 N252EA - Apr 16, 07:09 UTCApr 16, 07:49 UTC40m
2026-04-16 N252EA - Apr 16, 05:20 UTCApr 16, 07:05 UTC1h 45m
2026-04-16 N252EA - Apr 16, 03:34 UTCApr 16, 04:44 UTC1h 10m
2026-04-16 N252EA - Apr 16, 01:50 UTCApr 16, 02:50 UTC1h 0m
2026-04-16 N252EA - Apr 16, 01:10 UTCApr 16, 01:45 UTC35m
2026-04-15 N252EA - Apr 15, 23:10 UTCApr 16, 01:05 UTC1h 55m
2026-04-15 N252EA - Apr 15, 21:05 UTCApr 15, 22:50 UTC1h 45m
2026-04-15 N252EA - Apr 15, 20:30 UTCApr 15, 21:00 UTC30m
2026-04-15 N252EA - Apr 15, 19:05 UTCApr 15, 19:35 UTC30m
2026-04-15 N252EA - Apr 15, 17:40 UTCApr 15, 19:00 UTC1h 20m
2026-04-15 N252EA - Apr 15, 15:05 UTCApr 15, 16:25 UTC1h 20m
2026-04-15 N252EA - Apr 15, 14:10 UTCApr 15, 14:55 UTC44m
2026-04-15 N252EA - Apr 15, 09:00 UTCApr 15, 10:30 UTC1h 30m
2026-04-15 N252EA - Apr 15, 08:30 UTCApr 15, 08:55 UTC25m
2026-04-15 N252EA - Apr 15, 07:01 UTCApr 15, 08:20 UTC1h 20m
2026-04-15 N252EA - Apr 15, 05:40 UTCApr 15, 06:55 UTC1h 15m
2026-04-15 N252EA - Apr 15, 02:55 UTCApr 15, 04:50 UTC1h 55m
2026-04-15 N252EA - Apr 15, 02:25 UTCApr 15, 02:50 UTC25m
2026-04-15 N252EA - Apr 15, 00:55 UTCApr 15, 01:35 UTC40m
2026-04-14 N252EA - Apr 14, 23:05 UTCApr 15, 00:50 UTC1h 45m

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 N252EA page for operator, model, and routing details .

Mode-S A25F51 frequently asked

What is Mode-S code A25F51?
A25F51 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N252EA.
Where is Mode-S A25F51 registered?
Mode-S code A25F51 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 A25F51 broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A25F51, octal 50457521, decimal 10,641,233.
What flights does A25F51 operate?
Mode-S A25F51 has broadcast 1 distinct callsign, including N252EA.