Apparatus

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sensors Mode-S transponder

ABAB5C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N851DB · CESSNA 525A Citation CJ2 · operated by E-9 ENTERPRISES LLC

Hex
ABAB5C
Octal
52725534
Decimal
11,250,524
Country
US
Tail
N851DB
Type
C25A
No current signal · last broadcast 15d ago
Flights observed
92
Distinct callsigns
1
Country
US
Last broadcast
15d ago

Last known position

Most recent position reported by Mode-S ABAB5C.

Country allocation

The ICAO 24-bit address ABAB5C 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
N851DB - 92 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 N851DB - Jul 24, 00:55 UTCJul 24, 02:20 UTC1h 25m
2026-07-22 N851DB - Jul 22, 12:40 UTCJul 22, 13:55 UTC1h 15m
2026-07-18 N851DB - Jul 18, 20:35 UTCJul 18, 21:35 UTC1h 0m
2026-07-18 N851DB - Jul 18, 15:20 UTCJul 18, 16:45 UTC1h 25m
2026-07-18 N851DB - Jul 18, 12:05 UTCJul 18, 14:25 UTC2h 20m
2026-07-17 N851DB - Jul 17, 16:29 UTCJul 17, 18:34 UTC2h 5m
2026-07-17 N851DB - Jul 17, 13:25 UTCJul 17, 15:35 UTC2h 10m
2026-07-15 N851DB - Jul 15, 20:55 UTCJul 15, 22:50 UTC1h 55m
2026-07-15 N851DB SRQ → RSW Jul 15, 17:05 UTCJul 15, 17:25 UTC20m
2026-07-15 N851DB - Jul 15, 11:30 UTCJul 15, 13:10 UTC1h 40m
2026-07-13 N851DB - Jul 13, 18:50 UTCJul 13, 19:50 UTC1h 0m
2026-07-13 N851DB - Jul 13, 17:10 UTCJul 13, 18:05 UTC55m
2026-07-12 N851DB - Jul 12, 23:50 UTCJul 13, 00:35 UTC45m
2026-07-12 N851DB - Jul 12, 22:05 UTCJul 12, 22:50 UTC45m
2026-07-11 N851DB - Jul 11, 23:10 UTCJul 12, 00:25 UTC1h 15m
2026-07-11 N851DB - Jul 11, 14:05 UTCJul 11, 15:20 UTC1h 15m
2026-07-09 N851DB - Jul 9, 21:05 UTCJul 9, 22:40 UTC1h 35m
2026-07-09 N851DB - Jul 9, 18:10 UTCJul 9, 19:40 UTC1h 30m
2026-07-09 N851DB - Jul 9, 16:25 UTCJul 9, 16:55 UTC30m
2026-07-09 N851DB - Jul 9, 13:35 UTCJul 9, 14:30 UTC55m
2026-07-06 N851DB - Jul 6, 22:50 UTCJul 6, 23:35 UTC45m
2026-07-06 N851DB - Jul 6, 20:30 UTCJul 6, 21:45 UTC1h 15m
2026-06-29 N851DB - Jun 29, 19:24 UTCJun 29, 20:24 UTC1h 0m
2026-06-29 N851DB - Jun 29, 17:05 UTCJun 29, 18:05 UTC1h 0m
2026-06-28 N851DB - Jun 28, 12:09 UTCJun 28, 14:09 UTC2h 0m
2026-06-27 N851DB - Jun 27, 14:00 UTCJun 27, 16:04 UTC2h 5m
2026-06-26 N851DB - Jun 26, 18:39 UTCJun 26, 20:34 UTC1h 55m
2026-06-26 N851DB - Jun 26, 15:20 UTCJun 26, 17:19 UTC2h 0m
2026-06-18 N851DB - Jun 18, 16:45 UTCJun 18, 17:21 UTC36m
2026-06-18 N851DB - Jun 18, 12:30 UTCJun 18, 13:00 UTC30m
2026-06-15 N851DB - Jun 15, 18:50 UTCJun 15, 19:10 UTC20m
2026-06-15 N851DB - Jun 15, 14:15 UTCJun 15, 14:34 UTC20m
2026-06-09 N851DB - Jun 9, 22:55 UTCJun 10, 00:25 UTC1h 30m
2026-06-09 N851DB - Jun 9, 13:20 UTCJun 9, 14:55 UTC1h 35m
2026-06-07 N851DB - Jun 7, 13:05 UTCJun 7, 15:05 UTC2h 0m
2026-06-05 N851DB - Jun 5, 17:10 UTCJun 5, 19:10 UTC2h 0m
2026-06-05 N851DB - Jun 5, 13:15 UTCJun 5, 15:55 UTC2h 40m
2026-06-05 N851DB - Jun 5, 10:25 UTCJun 5, 12:30 UTC2h 5m
2026-06-03 N851DB - Jun 3, 19:55 UTCJun 3, 20:35 UTC40m
2026-06-03 N851DB - Jun 3, 16:40 UTCJun 3, 16:55 UTC15m
2026-06-03 N851DB - Jun 3, 13:30 UTCJun 3, 14:15 UTC45m
2026-06-02 N851DB - Jun 2, 19:35 UTCJun 2, 20:05 UTC30m
2026-06-02 N851DB - Jun 2, 16:50 UTCJun 2, 17:15 UTC25m
2026-06-02 N851DB - Jun 2, 11:40 UTCJun 2, 12:25 UTC45m
2026-05-31 N851DB - May 31, 20:05 UTCMay 31, 22:20 UTC2h 15m
2026-05-31 N851DB - May 31, 18:15 UTCMay 31, 19:15 UTC1h 0m
2026-05-31 N851DB - May 31, 16:30 UTCMay 31, 17:30 UTC1h 0m
2026-05-29 N851DB - May 29, 17:30 UTCMay 29, 18:30 UTC1h 0m
2026-05-29 N851DB - May 29, 15:40 UTCMay 29, 16:40 UTC1h 0m
2026-05-29 N851DB - May 29, 14:10 UTCMay 29, 15:10 UTC1h 0m

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 N851DB page for operator, model, and routing details .

Mode-S ABAB5C frequently asked

What is Mode-S code ABAB5C?
ABAB5C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N851DB.
Where is Mode-S ABAB5C registered?
Mode-S code ABAB5C 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 ABAB5C broadcasting right now?
No active broadcast right now. Last signal was 15d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABAB5C, octal 52725534, decimal 11,250,524.
What flights does ABAB5C operate?
Mode-S ABAB5C has broadcast 1 distinct callsign, including N851DB.