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sensors Mode-S transponder

AB904F

ICAO 24-bit transponder address · allocated to United States

Hex
AB904F
Octal
52710117
Decimal
11,243,599
Country
US
No current signal · last broadcast 8d ago
Flights observed
52
Distinct callsigns
1
Country
US
Last broadcast
8d ago

Last known position

Most recent position reported by Mode-S AB904F.

Country allocation

The ICAO 24-bit address AB904F 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
N844SK - 52 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N844SK - Jul 26, 21:15 UTCJul 26, 21:45 UTC30m
2026-07-26 N844SK - Jul 26, 15:25 UTCJul 26, 20:15 UTC4h 50m
2026-07-23 N844SK FLD → FLD Jul 23, 20:20 UTCJul 23, 20:45 UTC25m
2026-07-23 N844SK - Jul 23, 16:25 UTCJul 23, 16:50 UTC25m
2026-07-23 N844SK - Jul 23, 14:35 UTCJul 23, 14:50 UTC15m
2026-07-22 N844SK - Jul 22, 21:55 UTCJul 22, 22:15 UTC20m
2026-07-22 N844SK - Jul 22, 20:25 UTCJul 22, 20:45 UTC20m
2026-07-22 N844SK - Jul 22, 16:00 UTCJul 22, 16:25 UTC25m
2026-07-22 N844SK - Jul 22, 14:25 UTCJul 22, 14:40 UTC15m
2026-07-21 N844SK - Jul 21, 16:30 UTCJul 21, 16:55 UTC25m
2026-07-21 N844SK - Jul 21, 15:05 UTCJul 21, 15:30 UTC25m
2026-07-19 N844SK - Jul 19, 20:15 UTCJul 19, 21:00 UTC45m
2026-07-19 N844SK - Jul 19, 18:05 UTCJul 19, 19:40 UTC1h 35m
2026-07-19 N844SK - Jul 19, 13:35 UTCJul 19, 16:50 UTC3h 15m
2026-07-19 N844SK - Jul 19, 12:35 UTCJul 19, 13:00 UTC25m
2026-07-17 N844SK - Jul 17, 18:50 UTCJul 17, 19:09 UTC20m
2026-06-29 N844SK - Jun 29, 15:45 UTCJun 29, 16:00 UTC15m
2026-06-26 N844SK - Jun 26, 21:59 UTCJun 26, 22:25 UTC25m
2026-06-18 N844SK - Jun 18, 17:00 UTCJun 18, 17:21 UTC21m
2026-06-15 N844SK - Jun 15, 16:55 UTCJun 15, 17:15 UTC20m
2026-06-15 N844SK - Jun 15, 13:25 UTCJun 15, 14:24 UTC1h 0m
2026-06-15 N844SK - Jun 15, 12:19 UTCJun 15, 12:49 UTC30m
2026-06-12 N844SK - Jun 12, 14:40 UTCJun 12, 16:15 UTC1h 35m
2026-06-12 N844SK - Jun 12, 13:05 UTCJun 12, 13:50 UTC45m
2026-06-11 N844SK - Jun 11, 17:00 UTCJun 11, 18:10 UTC1h 10m
2026-05-28 N844SK - May 28, 19:10 UTCMay 28, 19:40 UTC30m
2026-05-28 N844SK - May 28, 17:00 UTCMay 28, 18:15 UTC1h 15m
2026-05-21 N844SK - May 21, 17:15 UTCMay 21, 17:35 UTC20m
2026-05-21 N844SK - May 21, 14:20 UTCMay 21, 14:30 UTC10m
2026-05-21 N844SK - May 21, 12:25 UTCMay 21, 13:05 UTC40m
2026-05-18 N844SK - May 18, 21:45 UTCMay 18, 22:20 UTC35m
2026-05-18 N844SK - May 18, 17:55 UTCMay 18, 20:35 UTC2h 39m
2026-05-18 N844SK - May 18, 13:30 UTCMay 18, 16:05 UTC2h 35m
2026-05-18 N844SK - May 18, 12:30 UTCMay 18, 12:50 UTC20m
2026-05-15 N844SK - May 15, 22:20 UTCMay 16, 01:25 UTC3h 5m
2026-05-15 N844SK - May 15, 20:40 UTCMay 15, 21:50 UTC1h 10m
2026-05-14 N844SK - May 14, 20:25 UTCMay 14, 22:55 UTC2h 30m
2026-05-14 N844SK - May 14, 19:30 UTCMay 14, 19:50 UTC20m
2026-05-14 N844SK - May 14, 15:40 UTCMay 14, 15:50 UTC10m
2026-05-14 N844SK - May 14, 13:45 UTCMay 14, 14:45 UTC1h 0m
2026-05-14 N844SK - May 14, 12:00 UTCMay 14, 13:40 UTC1h 40m
2026-05-12 N844SK - May 12, 18:25 UTCMay 12, 18:45 UTC20m
2026-05-07 N844SK - May 7, 17:50 UTCMay 7, 18:05 UTC15m
2026-05-07 N844SK - May 7, 17:25 UTCMay 7, 17:40 UTC15m
2026-05-07 N844SK - May 7, 14:05 UTCMay 7, 14:20 UTC15m
2026-04-30 N844SK - Apr 30, 18:20 UTCApr 30, 18:45 UTC25m
2026-04-30 N844SK - Apr 30, 15:05 UTCApr 30, 15:50 UTC45m
2026-04-19 N844SK - Apr 19, 15:50 UTCApr 19, 16:10 UTC20m
2026-04-19 N844SK - Apr 19, 14:30 UTCApr 19, 15:15 UTC45m
2026-04-19 N844SK - Apr 19, 13:35 UTCApr 19, 13:50 UTC15m

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 AB904F frequently asked

What is Mode-S code AB904F?
AB904F is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S AB904F registered?
Mode-S code AB904F 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 AB904F broadcasting right now?
No active broadcast right now. Last signal was 8d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB904F, octal 52710117, decimal 11,243,599.
What flights does AB904F operate?
Mode-S AB904F has broadcast 1 distinct callsign, including N844SK.