Apparatus

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sensors Mode-S transponder

AB7ABB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N839KS · CESSNA 172 Skyhawk · operated by KANSAS STATE UNIVERSITY, C/O POLYTECHNIC CAMPUS AVIATION DEPT

Hex
AB7ABB
Octal
52675273
Decimal
11,238,075
Country
US
Tail
N839KS
Type
C172
No current signal · last broadcast Jul 22, 19:55 UTC
Flights observed
86
Distinct callsigns
1
Country
US
Last broadcast
Jul 22, 19:55 UTC

Last known position

Most recent position reported by Mode-S AB7ABB.

Country allocation

The ICAO 24-bit address AB7ABB 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
KSU39 - 86 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 KSU39 - Jul 22, 18:35 UTCJul 22, 19:55 UTC1h 20m
2026-07-22 KSU39 - Jul 22, 02:30 UTCJul 22, 04:00 UTC1h 30m
2026-07-15 KSU39 - Jul 15, 23:55 UTCJul 16, 00:10 UTC15m
2026-07-09 KSU39 - Jul 9, 15:40 UTCJul 9, 15:50 UTC10m
2026-07-07 KSU39 - Jul 7, 23:45 UTCJul 8, 00:25 UTC40m
2026-07-07 KSU39 - Jul 7, 18:50 UTCJul 7, 19:10 UTC20m
2026-07-06 KSU39 - Jul 6, 22:00 UTCJul 6, 22:40 UTC40m
2026-07-06 KSU39 - Jul 6, 17:25 UTCJul 6, 19:05 UTC1h 40m
2026-06-24 KSU39 - Jun 24, 18:25 UTCJun 24, 18:44 UTC20m
2026-06-23 KSU39 - Jun 23, 15:40 UTCJun 23, 15:50 UTC10m
2026-06-15 KSU39 - Jun 15, 23:15 UTCJun 16, 01:30 UTC2h 15m
2026-06-15 KSU39 - Jun 15, 20:45 UTCJun 15, 22:35 UTC1h 50m
2026-06-15 KSU39 SLN → SLN Jun 15, 18:29 UTCJun 15, 20:10 UTC1h 40m
2026-06-15 KSU39 SLN → SLN Jun 15, 16:15 UTCJun 15, 17:50 UTC1h 35m
2026-06-15 KSU39 SLN → SLN Jun 15, 13:30 UTCJun 15, 15:10 UTC1h 40m
2026-06-12 KSU39 - Jun 12, 23:15 UTCJun 12, 23:30 UTC15m
2026-06-12 KSU39 - Jun 12, 21:40 UTCJun 12, 22:10 UTC30m
2026-06-12 KSU39 SLN → SLN Jun 12, 18:55 UTCJun 12, 19:45 UTC50m
2026-06-12 KSU39 SLN → SLN Jun 12, 16:40 UTCJun 12, 17:35 UTC55m
2026-06-12 KSU39 SLN → SLN Jun 12, 14:30 UTCJun 12, 15:45 UTC1h 15m
2026-06-12 KSU39 - Jun 12, 03:55 UTCJun 12, 04:15 UTC20m
2026-06-12 KSU39 - Jun 12, 02:05 UTCJun 12, 03:05 UTC1h 0m
2026-06-12 KSU39 - Jun 12, 00:25 UTCJun 12, 01:30 UTC1h 6m
2026-06-11 KSU39 SLN → SLN Jun 11, 18:20 UTCJun 11, 20:00 UTC1h 40m
2026-06-10 KSU39 SLN → SLN Jun 10, 19:05 UTCJun 10, 21:00 UTC1h 55m
2026-06-08 KSU39 SLN → SLN Jun 8, 19:35 UTCJun 8, 20:55 UTC1h 20m
2026-06-06 KSU39 - Jun 6, 17:29 UTCJun 6, 18:39 UTC1h 10m
2026-06-06 KSU39 - Jun 6, 14:54 UTCJun 6, 15:39 UTC45m
2026-06-06 KSU39 SLN → SLN Jun 6, 00:55 UTCJun 6, 02:05 UTC1h 10m
2026-06-05 KSU39 SLN → SLN Jun 5, 18:40 UTCJun 5, 19:20 UTC40m
2026-06-05 KSU39 SLN → SLN Jun 5, 15:00 UTCJun 5, 15:35 UTC35m
2026-06-05 KSU39 - Jun 5, 12:25 UTCJun 5, 13:45 UTC1h 20m
2026-06-04 KSU39 SLN → SLN Jun 4, 13:20 UTCJun 4, 14:20 UTC1h 0m
2026-06-03 KSU39 SLN → SLN Jun 3, 14:35 UTCJun 3, 15:10 UTC35m
2026-06-03 KSU39 SLN → SLN Jun 3, 13:20 UTCJun 3, 13:50 UTC30m
2026-06-03 KSU39 SLN → SLN Jun 3, 13:10 UTCJun 3, 13:15 UTC5m
2026-06-03 KSU39 - Jun 3, 01:25 UTCJun 3, 01:55 UTC30m
2026-06-02 KSU39 - Jun 2, 23:25 UTCJun 3, 00:15 UTC50m
2026-06-02 KSU39 SLN → SLN Jun 2, 18:55 UTCJun 2, 20:20 UTC1h 25m
2026-06-02 KSU39 SLN → SLN Jun 2, 16:05 UTCJun 2, 17:15 UTC1h 10m
2026-06-01 KSU39 - Jun 1, 19:55 UTCJun 1, 20:50 UTC55m
2026-06-01 KSU39 SLN → SLN Jun 1, 15:30 UTCJun 1, 16:45 UTC1h 15m
2026-06-01 KSU39 SLN → SLN Jun 1, 12:30 UTCJun 1, 13:50 UTC1h 20m
2026-05-27 KSU39 SLN → SLN May 27, 19:35 UTCMay 27, 20:50 UTC1h 15m
2026-05-27 KSU39 SLN → SLN May 27, 15:40 UTCMay 27, 17:10 UTC1h 30m
2026-05-22 KSU39 - May 22, 19:00 UTCMay 22, 20:25 UTC1h 25m
2026-05-21 KSU39 SLN → SLN May 21, 20:25 UTCMay 21, 22:35 UTC2h 10m
2026-05-21 KSU39 SLN → SLN May 21, 15:20 UTCMay 21, 16:50 UTC1h 30m
2026-05-20 KSU39 SLN → SLN May 20, 20:00 UTCMay 20, 21:25 UTC1h 25m
2026-05-20 KSU39 SLN → SLN May 20, 15:35 UTCMay 20, 16:15 UTC40m

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 N839KS page for operator, model, and routing details .

Mode-S AB7ABB frequently asked

What is Mode-S code AB7ABB?
AB7ABB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N839KS.
Where is Mode-S AB7ABB registered?
Mode-S code AB7ABB 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 AB7ABB broadcasting right now?
No active broadcast right now. Last signal was Jul 22, 19:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB7ABB, octal 52675273, decimal 11,238,075.
What flights does AB7ABB operate?
Mode-S AB7ABB has broadcast 1 distinct callsign, including KSU39.