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sensors Mode-S transponder

AD3FD2

ICAO 24-bit transponder address · allocated to United States

Hex
AD3FD2
Octal
53237722
Decimal
11,354,066
Country
US
No current signal · last broadcast 19d ago
Flights observed
48
Distinct callsigns
2
Country
US
Last broadcast
19d ago

Last known position

Most recent position reported by Mode-S AD3FD2.

Country allocation

The ICAO 24-bit address AD3FD2 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 2 distinct

Callsign Airline Flights Last seen
N953AF - 47 2026-07-25
CSTT711 - 1 2026-06-16

Recent flights last 48

DateFlightRouteTakeoffLandingDuration
2026-07-25 N953AF ADS → ADS Jul 25, 18:05 UTCJul 25, 20:40 UTC2h 35m
2026-07-25 N953AF ADS → ADS Jul 25, 14:55 UTCJul 25, 17:15 UTC2h 20m
2026-07-25 N953AF ADS → ADS Jul 25, 00:25 UTCJul 25, 02:20 UTC1h 55m
2026-07-24 N953AF ADS → ADS Jul 24, 21:05 UTCJul 24, 23:30 UTC2h 25m
2026-07-24 N953AF ADS → ADS Jul 24, 02:45 UTCJul 24, 05:00 UTC2h 15m
2026-07-23 N953AF ADS → ADS Jul 23, 23:55 UTCJul 24, 01:40 UTC1h 45m
2026-07-23 N953AF - Jul 23, 20:50 UTCJul 23, 22:45 UTC1h 55m
2026-07-23 N953AF ADS → ADS Jul 23, 17:40 UTCJul 23, 19:45 UTC2h 5m
2026-07-23 N953AF ADS → ADS Jul 23, 03:30 UTCJul 23, 06:25 UTC2h 55m
2026-07-22 N953AF - Jul 22, 23:35 UTCJul 22, 23:55 UTC20m
2026-07-22 N953AF - Jul 22, 22:45 UTCJul 22, 23:00 UTC15m
2026-07-22 N953AF ADS → ADS Jul 22, 18:25 UTCJul 22, 20:40 UTC2h 15m
2026-07-22 N953AF - Jul 22, 16:05 UTCJul 22, 16:45 UTC40m
2026-07-22 N953AF - Jul 22, 14:45 UTCJul 22, 15:25 UTC40m
2026-07-21 N953AF ADS → ADS Jul 21, 22:00 UTCJul 22, 00:10 UTC2h 10m
2026-07-21 N953AF ADS → ADS Jul 21, 16:10 UTCJul 21, 17:50 UTC1h 40m
2026-07-21 N953AF ADS → ADS Jul 21, 05:40 UTCJul 21, 05:55 UTC15m
2026-07-21 N953AF ADS → ADS Jul 21, 03:00 UTCJul 21, 05:15 UTC2h 15m
2026-07-20 N953AF ADS → ADS Jul 20, 23:15 UTCJul 21, 01:25 UTC2h 9m
2026-07-20 N953AF ADS → ADS Jul 20, 15:30 UTCJul 20, 17:45 UTC2h 15m
2026-07-20 N953AF - Jul 20, 02:40 UTCJul 20, 05:25 UTC2h 45m
2026-07-19 N953AF ADS → ADS Jul 19, 18:00 UTCJul 19, 19:50 UTC1h 50m
2026-07-18 N953AF ADS → ADS Jul 18, 12:50 UTCJul 18, 15:00 UTC2h 10m
2026-07-17 N953AF ADS → ADS Jul 17, 15:55 UTCJul 17, 17:44 UTC1h 50m
2026-07-16 N953AF ADS → ADS Jul 16, 17:45 UTCJul 16, 20:00 UTC2h 15m
2026-07-16 N953AF ADS → ADS Jul 16, 12:40 UTCJul 16, 15:05 UTC2h 25m
2026-07-15 N953AF ADS → ADS Jul 15, 23:10 UTCJul 16, 01:05 UTC1h 55m
2026-07-14 N953AF ADS → ADS Jul 14, 20:50 UTCJul 14, 23:00 UTC2h 9m
2026-07-14 N953AF ADS → ADS Jul 14, 13:25 UTCJul 14, 15:35 UTC2h 10m
2026-07-13 N953AF ADS → ADS Jul 13, 22:55 UTCJul 14, 00:50 UTC1h 55m
2026-07-13 N953AF - Jul 13, 16:20 UTCJul 13, 17:00 UTC40m
2026-07-13 N953AF - Jul 13, 13:15 UTCJul 13, 14:00 UTC45m
2026-07-12 N953AF - Jul 12, 14:35 UTCJul 12, 16:45 UTC2h 10m
2026-07-10 N953AF - Jul 10, 15:00 UTCJul 10, 16:40 UTC1h 40m
2026-07-10 N953AF ADS → ADS Jul 10, 12:10 UTCJul 10, 13:45 UTC1h 35m
2026-07-07 N953AF ADS → ADS Jul 7, 12:05 UTCJul 7, 13:55 UTC1h 50m
2026-07-06 N953AF - Jul 6, 20:00 UTCJul 6, 22:00 UTC2h 0m
2026-07-05 N953AF ADS → ADS Jul 5, 16:00 UTCJul 5, 17:55 UTC1h 55m
2026-07-05 N953AF - Jul 5, 13:05 UTCJul 5, 14:55 UTC1h 50m
2026-07-04 N953AF - Jul 4, 22:15 UTCJul 4, 23:50 UTC1h 35m
2026-07-04 N953AF ADS → ADS Jul 4, 19:20 UTCJul 4, 20:50 UTC1h 30m
2026-07-04 N953AF ADS → ADS Jul 4, 15:40 UTCJul 4, 17:35 UTC1h 55m
2026-07-03 N953AF - Jul 3, 15:10 UTCJul 3, 16:35 UTC1h 25m
2026-07-02 N953AF ADS → ADS Jul 2, 22:45 UTCJul 3, 01:00 UTC2h 15m
2026-07-02 N953AF - Jul 2, 19:00 UTCJul 2, 20:50 UTC1h 50m
2026-07-02 N953AF ADS → ADS Jul 2, 16:00 UTCJul 2, 17:50 UTC1h 50m
2026-07-01 N953AF - Jul 1, 18:30 UTCJul 1, 21:10 UTC2h 40m
2026-06-16 CSTT711 - Jun 16, 13:40 UTCJun 16, 14:00 UTC20m

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.

Mode-S AD3FD2 frequently asked

What is Mode-S code AD3FD2?
AD3FD2 is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S AD3FD2 registered?
Mode-S code AD3FD2 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 AD3FD2 broadcasting right now?
No active broadcast right now. Last signal was 19d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD3FD2, octal 53237722, decimal 11,354,066.
What flights does AD3FD2 operate?
Mode-S AD3FD2 has broadcast 2 distinct callsigns, including N953AF, CSTT711.