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sensors Mode-S transponder

AD4451

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N954JF · operated by JOHN FRY

Hex
AD4451
Octal
53242121
Decimal
11,355,217
Country
US
Tail
N954JF
No current signal · last broadcast Jul 25, 15:20 UTC
Flights observed
76
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 15:20 UTC

Last known position

Most recent position reported by Mode-S AD4451.

Country allocation

The ICAO 24-bit address AD4451 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
N954JF - 76 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 N954JF - Jul 25, 15:05 UTCJul 25, 15:20 UTC15m
2026-07-25 N954JF CRP → AUS Jul 25, 00:25 UTCJul 25, 01:35 UTC1h 10m
2026-07-24 N954JF - Jul 24, 23:15 UTCJul 24, 23:35 UTC20m
2026-07-24 N954JF - Jul 24, 20:15 UTCJul 24, 22:15 UTC2h 0m
2026-07-23 N954JF AUS → AUS Jul 23, 15:10 UTCJul 23, 16:55 UTC1h 45m
2026-07-22 N954JF - Jul 22, 17:50 UTCJul 22, 18:05 UTC15m
2026-07-20 N954JF - Jul 20, 13:35 UTCJul 20, 13:45 UTC10m
2026-07-09 N954JF - Jul 9, 19:05 UTCJul 9, 19:25 UTC20m
2026-07-08 N954JF AUS → AUS Jul 8, 16:50 UTCJul 8, 18:20 UTC1h 30m
2026-07-06 N954JF - Jul 6, 17:20 UTCJul 6, 17:40 UTC20m
2026-07-03 N954JF - Jul 3, 21:40 UTCJul 3, 21:50 UTC10m
2026-07-03 N954JF - Jul 3, 14:35 UTCJul 3, 14:55 UTC20m
2026-07-02 N954JF - Jul 2, 16:45 UTCJul 2, 17:20 UTC35m
2026-07-02 N954JF - Jul 2, 15:25 UTCJul 2, 15:55 UTC30m
2026-06-27 N954JF AUS → AUS Jun 27, 15:49 UTCJun 27, 16:39 UTC50m
2026-06-26 N954JF - Jun 26, 20:59 UTCJun 26, 21:24 UTC25m
2026-06-26 N954JF - Jun 26, 18:54 UTCJun 26, 19:20 UTC25m
2026-06-26 N954JF - Jun 26, 16:35 UTCJun 26, 17:35 UTC1h 0m
2026-06-25 N954JF - Jun 25, 21:10 UTCJun 25, 21:25 UTC15m
2026-06-24 N954JF - Jun 24, 20:35 UTCJun 24, 20:44 UTC10m
2026-06-24 N954JF - Jun 24, 18:34 UTCJun 24, 19:04 UTC30m
2026-06-24 N954JF - Jun 24, 13:54 UTCJun 24, 14:15 UTC20m
2026-06-23 N954JF - Jun 23, 18:29 UTCJun 23, 18:45 UTC15m
2026-06-23 N954JF AUS → AUS Jun 23, 15:04 UTCJun 23, 16:24 UTC1h 20m
2026-06-20 N954JF AUS → AUS Jun 20, 15:14 UTCJun 20, 16:44 UTC1h 30m
2026-06-19 N954JF AUS → AUS Jun 19, 16:44 UTCJun 19, 17:55 UTC1h 10m
2026-06-19 N954JF AUS → AUS Jun 19, 14:54 UTCJun 19, 15:39 UTC45m
2026-06-18 N954JF AUS → AUS Jun 18, 15:15 UTCJun 18, 16:50 UTC1h 35m
2026-06-15 N954JF - Jun 15, 21:30 UTCJun 15, 21:40 UTC10m
2026-06-12 N954JF - Jun 12, 13:25 UTCJun 12, 13:55 UTC30m
2026-06-10 N954JF AUS → AUS Jun 10, 15:25 UTCJun 10, 16:30 UTC1h 5m
2026-06-05 N954JF AUS → AUS Jun 5, 15:55 UTCJun 5, 17:40 UTC1h 45m
2026-06-03 N954JF AUS → AUS Jun 3, 14:40 UTCJun 3, 15:45 UTC1h 5m
2026-06-01 N954JF - Jun 1, 20:15 UTCJun 1, 20:45 UTC30m
2026-06-01 N954JF - Jun 1, 18:55 UTCJun 1, 19:30 UTC35m
2026-05-31 N954JF AUS → AUS May 31, 18:55 UTCMay 31, 19:30 UTC35m
2026-05-30 N954JF AUS → AUS May 30, 14:55 UTCMay 30, 15:40 UTC45m
2026-05-29 N954JF - May 29, 17:20 UTCMay 29, 17:50 UTC30m
2026-05-29 N954JF - May 29, 15:55 UTCMay 29, 16:50 UTC55m
2026-05-28 N954JF - May 28, 19:25 UTCMay 28, 19:55 UTC30m
2026-05-28 N954JF - May 28, 17:45 UTCMay 28, 18:00 UTC15m
2026-05-28 N954JF - May 28, 15:55 UTCMay 28, 16:55 UTC1h 0m
2026-05-28 N954JF AUS → AUS May 28, 14:20 UTCMay 28, 15:05 UTC45m
2026-05-26 N954JF - May 26, 22:05 UTCMay 26, 23:05 UTC1h 0m
2026-05-26 N954JF - May 26, 19:30 UTCMay 26, 20:09 UTC40m
2026-05-26 N954JF - May 26, 18:45 UTCMay 26, 18:59 UTC15m
2026-05-25 N954JF AUS → AUS May 25, 15:25 UTCMay 25, 16:50 UTC1h 25m
2026-05-22 N954JF AUS → AUS May 22, 15:55 UTCMay 22, 16:55 UTC1h 0m
2026-05-21 N954JF AUS → AUS May 21, 14:15 UTCMay 21, 15:30 UTC1h 15m
2026-05-19 N954JF AUS → AUS May 19, 20:05 UTCMay 19, 22:20 UTC2h 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 N954JF page for operator, model, and routing details .

Mode-S AD4451 frequently asked

What is Mode-S code AD4451?
AD4451 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N954JF.
Where is Mode-S AD4451 registered?
Mode-S code AD4451 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 AD4451 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 15:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD4451, octal 53242121, decimal 11,355,217.
What flights does AD4451 operate?
Mode-S AD4451 has broadcast 1 distinct callsign, including N954JF.