Apparatus

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sensors Mode-S transponder

A0FF53

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1631E · CESSNA 172 Skyhawk · operated by SKYWARRIOR FLIGHT TRAINING LLC

Hex
A0FF53
Octal
50177523
Decimal
10,551,123
Country
US
Tail
N1631E
Type
C172
No current signal · last broadcast Jul 24, 20:35 UTC
Flights observed
121
Distinct callsigns
1
Country
US
Last broadcast
Jul 24, 20:35 UTC

Last known position

Most recent position reported by Mode-S A0FF53.

Country allocation

The ICAO 24-bit address A0FF53 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
BL31E - 121 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 BL31E - Jul 24, 19:25 UTCJul 24, 20:35 UTC1h 10m
2026-07-24 BL31E - Jul 24, 15:50 UTCJul 24, 16:55 UTC1h 5m
2026-07-24 BL31E - Jul 24, 13:30 UTCJul 24, 14:55 UTC1h 25m
2026-07-23 BL31E - Jul 23, 18:55 UTCJul 23, 20:05 UTC1h 10m
2026-07-23 BL31E - Jul 23, 15:35 UTCJul 23, 16:20 UTC45m
2026-07-23 BL31E - Jul 23, 14:50 UTCJul 23, 15:00 UTC10m
2026-07-23 BL31E - Jul 23, 12:35 UTCJul 23, 13:50 UTC1h 15m
2026-07-20 BL31E - Jul 20, 17:50 UTCJul 20, 18:40 UTC50m
2026-07-20 BL31E - Jul 20, 14:35 UTCJul 20, 15:20 UTC45m
2026-07-20 BL31E - Jul 20, 12:00 UTCJul 20, 12:35 UTC35m
2026-07-17 BL31E - Jul 17, 15:29 UTCJul 17, 16:40 UTC1h 10m
2026-07-17 BL31E - Jul 17, 12:45 UTCJul 17, 14:10 UTC1h 25m
2026-07-16 BL31E - Jul 16, 15:35 UTCJul 16, 16:30 UTC55m
2026-07-16 BL31E - Jul 16, 13:30 UTCJul 16, 14:35 UTC1h 5m
2026-07-15 BL31E - Jul 15, 14:15 UTCJul 15, 15:30 UTC1h 15m
2026-07-14 BL31E - Jul 14, 15:40 UTCJul 14, 17:10 UTC1h 30m
2026-07-14 BL31E - Jul 14, 13:30 UTCJul 14, 14:50 UTC1h 20m
2026-07-10 BL31E - Jul 10, 15:45 UTCJul 10, 16:40 UTC55m
2026-07-10 BL31E - Jul 10, 12:05 UTCJul 10, 12:55 UTC50m
2026-07-09 BL31E - Jul 9, 18:55 UTCJul 9, 20:10 UTC1h 15m
2026-07-09 BL31E - Jul 9, 14:40 UTCJul 9, 15:45 UTC1h 5m
2026-07-09 BL31E - Jul 9, 12:00 UTCJul 9, 13:40 UTC1h 40m
2026-07-08 BL31E - Jul 8, 15:25 UTCJul 8, 17:00 UTC1h 35m
2026-07-08 BL31E - Jul 8, 13:25 UTCJul 8, 14:35 UTC1h 10m
2026-07-07 BL31E - Jul 7, 20:15 UTCJul 7, 21:20 UTC1h 5m
2026-07-07 BL31E - Jul 7, 18:05 UTCJul 7, 18:40 UTC35m
2026-06-24 BL31E - Jun 24, 15:09 UTCJun 24, 16:19 UTC1h 10m
2026-06-24 BL31E - Jun 24, 13:00 UTCJun 24, 14:15 UTC1h 15m
2026-06-23 BL31E - Jun 23, 18:55 UTCJun 23, 20:15 UTC1h 20m
2026-06-23 BL31E - Jun 23, 13:50 UTCJun 23, 15:04 UTC1h 15m
2026-06-23 BL31E - Jun 23, 11:59 UTCJun 23, 13:00 UTC1h 0m
2026-06-22 BL31E - Jun 22, 14:29 UTCJun 22, 15:24 UTC55m
2026-06-22 BL31E - Jun 22, 12:15 UTCJun 22, 13:29 UTC1h 15m
2026-06-15 BL31E - Jun 15, 20:40 UTCJun 15, 22:00 UTC1h 20m
2026-06-15 BL31E - Jun 15, 18:35 UTCJun 15, 19:39 UTC1h 5m
2026-06-12 BL31E - Jun 12, 19:05 UTCJun 12, 20:00 UTC55m
2026-06-12 BL31E - Jun 12, 14:45 UTCJun 12, 16:25 UTC1h 40m
2026-06-12 BL31E - Jun 12, 12:45 UTCJun 12, 13:35 UTC50m
2026-06-11 BL31E - Jun 11, 18:50 UTCJun 11, 20:05 UTC1h 15m
2026-06-11 BL31E - Jun 11, 15:50 UTCJun 11, 16:50 UTC1h 0m
2026-06-11 BL31E - Jun 11, 12:50 UTCJun 11, 14:20 UTC1h 30m
2026-06-10 BL31E - Jun 10, 22:05 UTCJun 10, 23:15 UTC1h 10m
2026-06-10 BL31E - Jun 10, 20:05 UTCJun 10, 21:20 UTC1h 15m
2026-06-10 BL31E GUF → GUF Jun 10, 13:35 UTCJun 10, 14:35 UTC1h 0m
2026-06-09 BL31E - Jun 9, 19:35 UTCJun 9, 20:15 UTC40m
2026-06-09 BL31E - Jun 9, 16:45 UTCJun 9, 18:40 UTC1h 55m
2026-06-09 BL31E - Jun 9, 13:25 UTCJun 9, 14:40 UTC1h 15m
2026-06-08 BL31E - Jun 8, 22:20 UTCJun 8, 22:55 UTC35m
2026-06-08 BL31E - Jun 8, 19:15 UTCJun 8, 20:05 UTC50m
2026-06-08 BL31E - Jun 8, 14:55 UTCJun 8, 16:10 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 N1631E page for operator, model, and routing details .

Mode-S A0FF53 frequently asked

What is Mode-S code A0FF53?
A0FF53 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1631E.
Where is Mode-S A0FF53 registered?
Mode-S code A0FF53 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 A0FF53 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 20:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0FF53, octal 50177523, decimal 10,551,123.
What flights does A0FF53 operate?
Mode-S A0FF53 has broadcast 1 distinct callsign, including BL31E.