Apparatus

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sensors Mode-S transponder

A57EDF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N453SP · CESSNA 172 Skyhawk · operated by UNITED STATES AIR FORCE OWNER, ELMENDORF AERO CLUB OPERATOR

Hex
A57EDF
Octal
51277337
Decimal
10,845,919
Country
US
Tail
N453SP
Type
C172
No current signal · last broadcast 4d ago
Flights observed
96
Distinct callsigns
1
Country
US
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S A57EDF.

Country allocation

The ICAO 24-bit address A57EDF 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
N453SP - 96 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N453SP - Jul 26, 16:20 UTCJul 26, 16:30 UTC10m
2026-07-26 N453SP - Jul 26, 15:55 UTCJul 26, 16:15 UTC20m
2026-07-21 N453SP - Jul 21, 21:15 UTCJul 21, 22:15 UTC1h 0m
2026-07-19 N453SP - Jul 19, 01:15 UTCJul 19, 02:30 UTC1h 15m
2026-07-18 N453SP - Jul 18, 20:35 UTCJul 18, 20:50 UTC15m
2026-07-16 N453SP - Jul 16, 20:25 UTCJul 16, 21:10 UTC45m
2026-07-13 N453SP HOM → EDF Jul 13, 19:15 UTCJul 13, 20:30 UTC1h 15m
2026-07-13 N453SP EDF → HOM Jul 13, 17:15 UTCJul 13, 18:35 UTC1h 20m
2026-07-11 N453SP EDF → EDF Jul 11, 18:20 UTCJul 11, 19:20 UTC1h 0m
2026-07-10 N453SP EDF → EDF Jul 10, 19:15 UTCJul 10, 21:15 UTC2h 0m
2026-07-07 N453SP - Jul 7, 04:35 UTCJul 7, 06:05 UTC1h 30m
2026-07-07 N453SP - Jul 7, 00:10 UTCJul 7, 01:20 UTC1h 10m
2026-07-03 N453SP EDF → EDF Jul 3, 17:50 UTCJul 3, 18:55 UTC1h 5m
2026-07-03 N453SP EDF → EDF Jul 3, 00:40 UTCJul 3, 01:25 UTC45m
2026-07-02 N453SP EDF → EDF Jul 2, 22:05 UTCJul 2, 22:40 UTC35m
2026-07-02 N453SP EDF → EDF Jul 2, 18:50 UTCJul 2, 19:50 UTC1h 0m
2026-07-01 N453SP EDF → EDF Jul 1, 21:15 UTCJul 1, 22:40 UTC1h 25m
2026-06-25 N453SP - Jun 25, 22:45 UTCJun 26, 00:10 UTC1h 25m
2026-06-24 N453SP - Jun 24, 02:05 UTCJun 24, 03:10 UTC1h 5m
2026-06-20 N453SP EDF → EDF Jun 20, 23:34 UTCJun 21, 01:10 UTC1h 35m
2026-06-19 N453SP EDF → EDF Jun 19, 21:09 UTCJun 19, 21:54 UTC45m
2026-06-19 N453SP - Jun 19, 16:39 UTCJun 19, 17:24 UTC45m
2026-06-19 N453SP - Jun 19, 16:19 UTCJun 19, 16:34 UTC15m
2026-06-18 N453SP - Jun 18, 22:40 UTCJun 18, 23:50 UTC1h 10m
2026-06-18 N453SP EDF → EDF Jun 18, 18:25 UTCJun 18, 19:45 UTC1h 20m
2026-06-18 N453SP EDF → EDF Jun 18, 02:50 UTCJun 18, 04:25 UTC1h 35m
2026-06-18 N453SP EDF → EDF Jun 18, 01:05 UTCJun 18, 01:40 UTC35m
2026-06-17 N453SP EDF → EDF Jun 17, 20:20 UTCJun 17, 20:45 UTC25m
2026-06-17 N453SP - Jun 17, 02:05 UTCJun 17, 03:10 UTC1h 5m
2026-06-17 N453SP EDF → TKA Jun 17, 00:45 UTCJun 17, 01:55 UTC1h 10m
2026-06-16 N453SP EDF → EDF Jun 16, 19:25 UTCJun 16, 20:40 UTC1h 16m
2026-06-16 N453SP EDF → EDF Jun 16, 03:20 UTCJun 16, 03:55 UTC35m
2026-06-13 N453SP EDF → EDF Jun 13, 20:25 UTCJun 13, 20:35 UTC10m
2026-06-13 N453SP EDF → EDF Jun 13, 19:40 UTCJun 13, 20:20 UTC40m
2026-06-13 N453SP EDF → EDF Jun 13, 01:15 UTCJun 13, 02:00 UTC45m
2026-06-12 N453SP EDF → EDF Jun 12, 00:25 UTCJun 12, 00:55 UTC31m
2026-06-10 N453SP - Jun 10, 22:00 UTCJun 10, 22:40 UTC40m
2026-06-09 N453SP - Jun 9, 23:00 UTCJun 9, 23:45 UTC45m
2026-06-09 N453SP EDF → SXQ Jun 9, 19:05 UTCJun 9, 19:40 UTC35m
2026-06-08 N453SP - Jun 8, 18:25 UTCJun 8, 19:30 UTC1h 5m
2026-06-05 N453SP - Jun 5, 22:40 UTCJun 5, 23:25 UTC45m
2026-06-05 N453SP - Jun 5, 05:30 UTCJun 5, 06:35 UTC1h 5m
2026-06-05 N453SP - Jun 5, 04:10 UTCJun 5, 04:50 UTC40m
2026-06-05 N453SP EDF → EDF Jun 5, 01:45 UTCJun 5, 02:05 UTC20m
2026-06-04 N453SP FRN → EDF Jun 4, 22:45 UTCJun 4, 23:20 UTC35m
2026-06-04 N453SP EDF → EDF Jun 4, 02:25 UTCJun 4, 03:25 UTC1h 0m
2026-06-03 N453SP HOM → EDF Jun 3, 23:30 UTCJun 4, 01:00 UTC1h 30m
2026-06-03 N453SP - Jun 3, 21:15 UTCJun 3, 22:05 UTC50m
2026-06-03 N453SP EDF → SXQ Jun 3, 19:40 UTCJun 3, 20:40 UTC1h 0m
2026-06-03 N453SP VDZ → EDF Jun 3, 03:35 UTCJun 3, 05:05 UTC1h 30m

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 N453SP page for operator, model, and routing details .

Mode-S A57EDF frequently asked

What is Mode-S code A57EDF?
A57EDF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N453SP.
Where is Mode-S A57EDF registered?
Mode-S code A57EDF 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 A57EDF 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 A57EDF, octal 51277337, decimal 10,845,919.
What flights does A57EDF operate?
Mode-S A57EDF has broadcast 1 distinct callsign, including N453SP.