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sensors Mode-S transponder

ADEFC4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N99750 · CESSNA 172 Skyhawk · operated by CIVIL AIR PATROL

Hex
ADEFC4
Octal
53367704
Decimal
11,399,108
Country
US
Tail
N99750
Type
C172
No current signal · last broadcast 14d ago
Flights observed
64
Distinct callsigns
1
Country
US
Last broadcast
14d ago

Last known position

Most recent position reported by Mode-S ADEFC4.

Country allocation

The ICAO 24-bit address ADEFC4 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
N99750 - 64 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 N99750 - Jul 22, 20:20 UTCJul 22, 21:15 UTC55m
2026-07-22 N99750 - Jul 22, 18:05 UTCJul 22, 19:00 UTC55m
2026-07-22 N99750 - Jul 22, 15:20 UTCJul 22, 16:35 UTC1h 15m
2026-07-22 N99750 - Jul 22, 12:40 UTCJul 22, 13:45 UTC1h 5m
2026-07-21 N99750 - Jul 21, 12:40 UTCJul 21, 13:50 UTC1h 10m
2026-07-20 N99750 - Jul 20, 22:55 UTCJul 20, 23:25 UTC30m
2026-07-20 N99750 - Jul 20, 15:40 UTCJul 20, 16:40 UTC1h 0m
2026-07-20 N99750 - Jul 20, 13:00 UTCJul 20, 14:00 UTC1h 0m
2026-07-18 N99750 - Jul 18, 13:40 UTCJul 18, 14:30 UTC50m
2026-07-17 N99750 - Jul 17, 15:44 UTCJul 17, 16:44 UTC1h 0m
2026-07-17 N99750 - Jul 17, 13:29 UTCJul 17, 14:00 UTC30m
2026-07-16 N99750 - Jul 16, 23:10 UTCJul 17, 00:04 UTC55m
2026-07-16 N99750 - Jul 16, 19:40 UTCJul 16, 21:05 UTC1h 25m
2026-07-16 N99750 - Jul 16, 16:30 UTCJul 16, 17:45 UTC1h 15m
2026-07-16 N99750 - Jul 16, 14:40 UTCJul 16, 15:10 UTC30m
2026-07-16 N99750 - Jul 16, 13:20 UTCJul 16, 14:05 UTC45m
2026-07-15 N99750 - Jul 15, 18:20 UTCJul 15, 19:10 UTC50m
2026-07-15 N99750 - Jul 15, 12:45 UTCJul 15, 14:15 UTC1h 30m
2026-07-15 N99750 - Jul 15, 01:05 UTCJul 15, 01:30 UTC25m
2026-07-14 N99750 - Jul 14, 18:20 UTCJul 14, 18:40 UTC20m
2026-07-14 N99750 - Jul 14, 13:55 UTCJul 14, 14:50 UTC55m
2026-07-13 N99750 - Jul 13, 18:30 UTCJul 13, 19:25 UTC55m
2026-07-13 N99750 - Jul 13, 12:25 UTCJul 13, 13:35 UTC1h 10m
2026-07-09 N99750 - Jul 9, 19:50 UTCJul 9, 20:05 UTC15m
2026-07-08 N99750 - Jul 8, 22:35 UTCJul 9, 00:00 UTC1h 25m
2026-07-08 N99750 - Jul 8, 21:10 UTCJul 8, 22:00 UTC50m
2026-07-08 N99750 - Jul 8, 18:10 UTCJul 8, 19:00 UTC50m
2026-07-08 N99750 - Jul 8, 15:20 UTCJul 8, 17:00 UTC1h 40m
2026-07-08 N99750 - Jul 8, 13:10 UTCJul 8, 14:00 UTC50m
2026-07-07 N99750 - Jul 7, 21:05 UTCJul 7, 22:10 UTC1h 5m
2026-07-07 N99750 - Jul 7, 19:35 UTCJul 7, 19:45 UTC10m
2026-07-07 N99750 - Jul 7, 18:10 UTCJul 7, 18:40 UTC30m
2026-07-07 N99750 - Jul 7, 15:30 UTCJul 7, 17:05 UTC1h 35m
2026-07-06 N99750 - Jul 6, 18:50 UTCJul 6, 19:40 UTC50m
2026-07-04 N99750 - Jul 4, 14:00 UTCJul 4, 15:00 UTC1h 0m
2026-07-04 N99750 - Jul 4, 11:55 UTCJul 4, 12:50 UTC55m
2026-07-03 N99750 - Jul 3, 14:25 UTCJul 3, 15:10 UTC45m
2026-07-02 N99750 - Jul 2, 20:30 UTCJul 2, 21:15 UTC45m
2026-07-02 N99750 - Jul 2, 18:10 UTCJul 2, 19:30 UTC1h 20m
2026-07-02 N99750 - Jul 2, 14:55 UTCJul 2, 16:25 UTC1h 30m
2026-07-02 N99750 - Jul 2, 11:45 UTCJul 2, 13:55 UTC2h 10m
2026-07-02 N99750 - Jul 2, 01:30 UTCJul 2, 04:05 UTC2h 35m
2026-07-01 N99750 - Jul 1, 18:20 UTCJul 1, 18:40 UTC20m
2026-07-01 N99750 - Jul 1, 16:40 UTCJul 1, 17:35 UTC55m
2026-07-01 N99750 - Jul 1, 14:40 UTCJul 1, 15:30 UTC50m
2026-07-01 N99750 - Jul 1, 11:55 UTCJul 1, 14:05 UTC2h 10m
2026-06-30 N99750 - Jun 30, 17:50 UTCJun 30, 19:25 UTC1h 35m
2026-06-30 N99750 - Jun 30, 13:30 UTCJun 30, 14:00 UTC30m
2026-06-29 N99750 - Jun 29, 14:04 UTCJun 29, 14:29 UTC25m
2026-06-03 N99750 - Jun 3, 13:25 UTCJun 3, 14:15 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 N99750 page for operator, model, and routing details .

Mode-S ADEFC4 frequently asked

What is Mode-S code ADEFC4?
ADEFC4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N99750.
Where is Mode-S ADEFC4 registered?
Mode-S code ADEFC4 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 ADEFC4 broadcasting right now?
No active broadcast right now. Last signal was 14d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADEFC4, octal 53367704, decimal 11,399,108.
What flights does ADEFC4 operate?
Mode-S ADEFC4 has broadcast 1 distinct callsign, including N99750.