Apparatus

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sensors Mode-S transponder

ABAB4F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N851CP · CESSNA 172 Skyhawk · operated by CIVIL AIR PATROL

Hex
ABAB4F
Octal
52725517
Decimal
11,250,511
Country
US
Tail
N851CP
Type
C172
No current signal · last broadcast 1d ago
Flights observed
66
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S ABAB4F.

Country allocation

The ICAO 24-bit address ABAB4F 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
CAP3051 - 66 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-19 CAP3051 - Jul 19, 15:40 UTCJul 19, 16:00 UTC20m
2026-07-19 CAP3051 - Jul 19, 14:25 UTCJul 19, 14:55 UTC30m
2026-07-18 CAP3051 - Jul 18, 16:40 UTCJul 18, 17:10 UTC30m
2026-07-18 CAP3051 - Jul 18, 15:05 UTCJul 18, 15:35 UTC30m
2026-07-15 CAP3051 - Jul 15, 16:50 UTCJul 15, 17:05 UTC15m
2026-07-15 CAP3051 - Jul 15, 14:40 UTCJul 15, 16:10 UTC1h 30m
2026-07-15 CAP3051 - Jul 15, 12:55 UTCJul 15, 13:05 UTC10m
2026-07-12 CAP3051 - Jul 12, 19:01 UTCJul 12, 19:20 UTC20m
2026-07-12 CAP3051 - Jul 12, 17:40 UTCJul 12, 18:01 UTC20m
2026-07-12 CAP3051 - Jul 12, 15:55 UTCJul 12, 16:10 UTC15m
2026-07-12 CAP3051 - Jul 12, 15:05 UTCJul 12, 15:15 UTC10m
2026-07-11 CAP3051 - Jul 11, 14:50 UTCJul 11, 15:40 UTC50m
2026-06-29 CAP3051 - Jun 29, 14:04 UTCJun 29, 15:00 UTC55m
2026-06-26 CAP3051 - Jun 26, 15:25 UTCJun 26, 16:24 UTC1h 0m
2026-06-13 CAP3051 - Jun 13, 03:40 UTCJun 13, 03:55 UTC15m
2026-06-13 CAP3051 - Jun 13, 01:25 UTCJun 13, 01:55 UTC30m
2026-06-12 CAP3051 - Jun 12, 20:15 UTCJun 12, 20:40 UTC25m
2026-06-11 CAP3051 - Jun 11, 20:15 UTCJun 11, 20:35 UTC20m
2026-06-11 CAP3051 - Jun 11, 17:40 UTCJun 11, 17:55 UTC15m
2026-06-11 CAP3051 - Jun 11, 15:40 UTCJun 11, 16:05 UTC25m
2026-06-11 CAP3051 - Jun 11, 00:55 UTCJun 11, 01:55 UTC1h 0m
2026-06-10 CAP3051 - Jun 10, 18:45 UTCJun 10, 20:25 UTC1h 40m
2026-06-10 CAP3051 - Jun 10, 15:00 UTCJun 10, 16:10 UTC1h 10m
2026-06-09 CAP3051 - Jun 9, 20:35 UTCJun 9, 20:45 UTC10m
2026-06-09 CAP3051 - Jun 9, 18:20 UTCJun 9, 18:30 UTC10m
2026-06-09 CAP3051 - Jun 9, 15:40 UTCJun 9, 15:50 UTC10m
2026-06-08 CAP3051 - Jun 8, 19:35 UTCJun 8, 20:55 UTC1h 20m
2026-06-08 CAP3051 - Jun 8, 16:40 UTCJun 8, 17:05 UTC25m
2026-06-08 CAP3051 - Jun 8, 15:30 UTCJun 8, 16:00 UTC30m
2026-06-07 CAP3051 - Jun 7, 18:50 UTCJun 7, 20:00 UTC1h 10m
2026-06-07 CAP3051 - Jun 7, 15:35 UTCJun 7, 16:40 UTC1h 5m
2026-06-05 CAP3051 - Jun 5, 14:55 UTCJun 5, 15:35 UTC40m
2026-06-05 CAP3051 - Jun 5, 13:20 UTCJun 5, 13:30 UTC10m
2026-05-31 CAP3051 - May 31, 17:35 UTCMay 31, 18:00 UTC25m
2026-05-31 CAP3051 - May 31, 15:45 UTCMay 31, 16:25 UTC40m
2026-05-31 CAP3051 ABQ → ABQ May 31, 14:10 UTCMay 31, 14:40 UTC30m
2026-05-25 CAP3051 - May 25, 15:45 UTCMay 25, 16:30 UTC45m
2026-05-25 CAP3051 - May 25, 14:30 UTCMay 25, 15:05 UTC35m
2026-05-24 CAP3051 - May 24, 18:40 UTCMay 24, 19:05 UTC25m
2026-05-24 CAP3051 - May 24, 15:45 UTCMay 24, 16:10 UTC25m
2026-05-24 CAP3051 - May 24, 14:20 UTCMay 24, 14:45 UTC25m
2026-05-23 CAP3051 - May 23, 16:05 UTCMay 23, 16:40 UTC35m
2026-05-23 CAP3051 - May 23, 14:45 UTCMay 23, 15:30 UTC45m
2026-05-21 CAP3051 - May 21, 15:10 UTCMay 21, 16:25 UTC1h 15m
2026-05-17 CAP3051 - May 17, 15:55 UTCMay 17, 17:10 UTC1h 15m
2026-05-16 CAP3051 - May 16, 15:55 UTCMay 16, 17:15 UTC1h 20m
2026-05-15 CAP3051 - May 15, 22:25 UTCMay 15, 23:30 UTC1h 5m
2026-05-15 CAP3051 - May 15, 14:15 UTCMay 15, 15:05 UTC49m
2026-05-14 CAP3051 ABQ → ABQ May 14, 15:05 UTCMay 14, 16:30 UTC1h 25m
2026-05-07 CAP3051 - May 7, 21:55 UTCMay 7, 23:14 UTC1h 19m

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 N851CP page for operator, model, and routing details .

Mode-S ABAB4F frequently asked

What is Mode-S code ABAB4F?
ABAB4F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N851CP.
Where is Mode-S ABAB4F registered?
Mode-S code ABAB4F 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 ABAB4F broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABAB4F, octal 52725517, decimal 11,250,511.
What flights does ABAB4F operate?
Mode-S ABAB4F has broadcast 1 distinct callsign, including CAP3051.