Apparatus

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sensors Mode-S transponder

A9EAD4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N738XD · CESSNA 172 Skyhawk · operated by MLS AVIATION LLC

Hex
A9EAD4
Octal
52365324
Decimal
11,135,700
Country
US
Tail
N738XD
Type
C172
No current signal · last broadcast 3h ago
Flights observed
127
Distinct callsigns
1
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A9EAD4.

Country allocation

The ICAO 24-bit address A9EAD4 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
N738XD - 127 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 N738XD CNO → CNO May 30, 01:50 UTCMay 30, 02:45 UTC55m
2026-05-29 N738XD - May 29, 21:55 UTCMay 29, 22:45 UTC50m
2026-05-28 N738XD SBD → CNO May 28, 23:25 UTCMay 28, 23:50 UTC25m
2026-05-28 N738XD - May 28, 21:10 UTCMay 28, 22:25 UTC1h 15m
2026-05-28 N738XD SBD → SBD May 28, 16:45 UTCMay 28, 18:05 UTC1h 20m
2026-05-28 N738XD CNO → SBD May 28, 01:10 UTCMay 28, 01:50 UTC40m
2026-05-27 N738XD - May 27, 23:40 UTCMay 27, 23:55 UTC15m
2026-05-27 N738XD - May 27, 21:35 UTCMay 27, 22:50 UTC1h 15m
2026-05-27 N738XD - May 27, 17:15 UTCMay 27, 18:30 UTC1h 15m
2026-05-27 N738XD CNO → SBD May 27, 13:45 UTCMay 27, 14:10 UTC25m
2026-05-26 N738XD - May 26, 21:29 UTCMay 26, 22:54 UTC1h 25m
2026-05-26 N738XD SBD → CNO May 26, 18:30 UTCMay 26, 19:15 UTC45m
2026-05-26 N738XD CNO → SBD May 26, 17:59 UTCMay 26, 18:19 UTC20m
2026-05-26 N738XD CNO → CNO May 26, 00:09 UTCMay 26, 01:20 UTC1h 10m
2026-05-25 N738XD - May 25, 21:54 UTCMay 25, 22:30 UTC35m
2026-05-25 N738XD CNO → CNO May 25, 19:54 UTCMay 25, 20:59 UTC1h 5m
2026-05-24 N738XD CNO → CNO May 24, 20:40 UTCMay 24, 21:30 UTC50m
2026-05-23 N738XD CNO → CNO May 23, 21:45 UTCMay 23, 23:00 UTC1h 15m
2026-05-23 N738XD CNO → CNO May 23, 19:35 UTCMay 23, 21:00 UTC1h 25m
2026-05-22 N738XD CNO → CNO May 22, 23:30 UTCMay 23, 00:50 UTC1h 20m
2026-05-22 N738XD - May 22, 22:00 UTCMay 22, 23:00 UTC1h 0m
2026-05-22 N738XD CNO → CNO May 22, 19:40 UTCMay 22, 20:55 UTC1h 15m
2026-05-22 N738XD CNO → CNO May 22, 17:50 UTCMay 22, 18:50 UTC1h 0m
2026-05-21 N738XD - May 21, 21:35 UTCMay 21, 22:40 UTC1h 5m
2026-05-18 N738XD CNO → CNO May 18, 17:35 UTCMay 18, 18:55 UTC1h 19m
2026-05-17 N738XD CNO → CNO May 17, 23:20 UTCMay 18, 01:00 UTC1h 40m
2026-05-17 N738XD CNO → CNO May 17, 19:55 UTCMay 17, 20:40 UTC45m
2026-05-15 N738XD CNO → CNO May 15, 17:50 UTCMay 15, 19:05 UTC1h 15m
2026-05-15 N738XD CCB → CNO May 15, 01:35 UTCMay 15, 01:50 UTC15m
2026-05-15 N738XD CCB → CCB May 15, 00:00 UTCMay 15, 01:00 UTC1h 0m
2026-05-14 N738XD - May 14, 20:55 UTCMay 14, 21:05 UTC10m
2026-05-14 N738XD - May 14, 19:00 UTCMay 14, 20:05 UTC1h 5m
2026-05-14 N738XD - May 14, 16:45 UTCMay 14, 17:55 UTC1h 10m
2026-05-14 N738XD CNO → CNO May 14, 01:35 UTCMay 14, 03:15 UTC1h 40m
2026-05-13 N738XD CNO → CNO May 13, 21:45 UTCMay 13, 22:50 UTC1h 5m
2026-05-13 N738XD CNO → CNO May 13, 19:35 UTCMay 13, 20:40 UTC1h 5m
2026-05-13 N738XD CNO → CNO May 13, 17:40 UTCMay 13, 18:40 UTC1h 0m
2026-05-12 N738XD - May 12, 23:55 UTCMay 13, 01:20 UTC1h 25m
2026-05-12 N738XD CNO → CNO May 12, 21:55 UTCMay 12, 22:50 UTC55m
2026-05-11 N738XD - May 11, 22:00 UTCMay 11, 22:35 UTC34m
2026-05-11 N738XD CNO → CNO May 11, 19:45 UTCMay 11, 21:00 UTC1h 15m
2026-05-11 N738XD CNO → CNO May 11, 17:40 UTCMay 11, 18:50 UTC1h 10m
2026-05-10 N738XD - May 10, 21:14 UTCMay 10, 22:15 UTC1h 0m
2026-05-10 N738XD CNO → CNO May 10, 19:35 UTCMay 10, 20:40 UTC1h 5m
2026-05-10 N738XD CNO → CNO May 10, 03:40 UTCMay 10, 05:04 UTC1h 25m
2026-05-10 N738XD CNO → CNO May 10, 00:24 UTCMay 10, 01:04 UTC40m
2026-05-09 N738XD ONT → CNO May 9, 21:50 UTCMay 9, 22:39 UTC50m
2026-05-09 N738XD - May 9, 20:00 UTCMay 9, 20:55 UTC55m
2026-05-09 N738XD CNO → CNO May 9, 17:55 UTCMay 9, 19:10 UTC1h 15m
2026-05-08 N738XD - May 8, 21:25 UTCMay 8, 22:55 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 N738XD page for operator, model, and routing details .

Mode-S A9EAD4 frequently asked

What is Mode-S code A9EAD4?
A9EAD4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N738XD.
Where is Mode-S A9EAD4 registered?
Mode-S code A9EAD4 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 A9EAD4 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9EAD4, octal 52365324, decimal 11,135,700.
What flights does A9EAD4 operate?
Mode-S A9EAD4 has broadcast 1 distinct callsign, including N738XD.