Apparatus

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sensors Mode-S transponder

A2CCBF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N28MK · operated by ALF IX LLC

Hex
A2CCBF
Octal
50546277
Decimal
10,669,247
Country
US
Tail
N28MK
Type
C172
No current signal · last broadcast 14h ago
Flights observed
127
Distinct callsigns
1
Country
US
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S A2CCBF.

Country allocation

The ICAO 24-bit address A2CCBF 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
N28MK - 127 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N28MK DBQ → DBQ Jul 13, 21:35 UTCJul 13, 23:30 UTC1h 55m
2026-07-13 N28MK - Jul 13, 17:15 UTCJul 13, 17:35 UTC20m
2026-07-13 N28MK - Jul 13, 14:35 UTCJul 13, 16:40 UTC2h 5m
2026-07-08 N28MK DBQ → DBQ Jul 8, 20:20 UTCJul 8, 21:25 UTC1h 5m
2026-07-08 N28MK DBQ → DBQ Jul 8, 18:05 UTCJul 8, 19:20 UTC1h 15m
2026-07-08 N28MK DBQ → DBQ Jul 8, 15:20 UTCJul 8, 16:30 UTC1h 10m
2026-07-07 N28MK DBQ → DBQ Jul 7, 20:30 UTCJul 7, 21:45 UTC1h 15m
2026-07-07 N28MK DBQ → DBQ Jul 7, 17:50 UTCJul 7, 19:00 UTC1h 10m
2026-07-07 N28MK DBQ → DBQ Jul 7, 15:55 UTCJul 7, 16:40 UTC45m
2026-07-01 N28MK DBQ → DBQ Jul 1, 14:45 UTCJul 1, 17:35 UTC2h 50m
2026-06-30 N28MK DBQ → DBQ Jun 30, 14:50 UTCJun 30, 17:00 UTC2h 10m
2026-06-29 N28MK - Jun 29, 21:24 UTCJun 29, 23:19 UTC1h 55m
2026-06-29 N28MK - Jun 29, 20:00 UTCJun 29, 20:44 UTC45m
2026-06-29 N28MK - Jun 29, 16:50 UTCJun 29, 17:59 UTC1h 10m
2026-06-26 N28MK DBQ → DBQ Jun 26, 17:44 UTCJun 26, 18:49 UTC1h 5m
2026-06-26 N28MK DBQ → DBQ Jun 26, 14:39 UTCJun 26, 15:29 UTC50m
2026-06-25 N28MK - Jun 25, 21:50 UTCJun 25, 22:34 UTC45m
2026-06-25 N28MK DBQ → GBG Jun 25, 12:35 UTCJun 25, 13:24 UTC50m
2026-06-23 N28MK DBQ → DBQ Jun 23, 17:59 UTCJun 23, 19:00 UTC1h 0m
2026-06-23 N28MK DBQ → DBQ Jun 23, 14:44 UTCJun 23, 15:50 UTC1h 5m
2026-06-22 N28MK DBQ → DBQ Jun 22, 19:54 UTCJun 22, 20:55 UTC1h 0m
2026-06-22 N28MK - Jun 22, 17:00 UTCJun 22, 18:24 UTC1h 25m
2026-06-22 N28MK - Jun 22, 15:35 UTCJun 22, 16:20 UTC45m
2026-06-22 N28MK - Jun 22, 11:24 UTCJun 22, 12:59 UTC1h 35m
2026-06-18 N28MK DBQ → DBQ Jun 18, 22:15 UTCJun 18, 23:30 UTC1h 15m
2026-06-18 N28MK - Jun 18, 16:55 UTCJun 18, 19:00 UTC2h 5m
2026-06-18 N28MK - Jun 18, 13:25 UTCJun 18, 14:15 UTC50m
2026-06-15 N28MK DBQ → DBQ Jun 15, 17:54 UTCJun 15, 18:35 UTC40m
2026-06-15 N28MK DBQ → DBQ Jun 15, 15:15 UTCJun 15, 16:15 UTC1h 0m
2026-06-12 N28MK DBQ → DBQ Jun 12, 13:55 UTCJun 12, 15:05 UTC1h 10m
2026-06-04 N28MK DBQ → DBQ Jun 4, 17:55 UTCJun 4, 18:45 UTC50m
2026-06-04 N28MK DBQ → DBQ Jun 4, 14:55 UTCJun 4, 15:50 UTC55m
2026-06-03 N28MK DBQ → DBQ Jun 3, 22:45 UTCJun 4, 00:20 UTC1h 35m
2026-06-03 N28MK DBQ → DBQ Jun 3, 20:25 UTCJun 3, 21:30 UTC1h 5m
2026-06-03 N28MK DBQ → DBQ Jun 3, 18:35 UTCJun 3, 19:25 UTC50m
2026-06-03 N28MK DBQ → DBQ Jun 3, 14:15 UTCJun 3, 15:20 UTC1h 5m
2026-06-02 N28MK DBQ → DBQ Jun 2, 17:45 UTCJun 2, 18:55 UTC1h 10m
2026-06-02 N28MK DBQ → DBQ Jun 2, 15:45 UTCJun 2, 16:30 UTC45m
2026-06-02 N28MK DBQ → DBQ Jun 2, 13:55 UTCJun 2, 14:50 UTC55m
2026-06-01 N28MK DBQ → DBQ Jun 1, 23:05 UTCJun 2, 00:20 UTC1h 15m
2026-06-01 N28MK DBQ → DBQ Jun 1, 16:25 UTCJun 1, 17:15 UTC50m
2026-05-29 N28MK - May 29, 17:30 UTCMay 29, 19:15 UTC1h 45m
2026-05-29 N28MK DBQ → GRB May 29, 14:35 UTCMay 29, 16:30 UTC1h 55m
2026-05-28 N28MK DBQ → DBQ May 28, 21:55 UTCMay 28, 23:10 UTC1h 15m
2026-05-28 N28MK DBQ → DBQ May 28, 19:45 UTCMay 28, 20:55 UTC1h 10m
2026-05-27 N28MK DBQ → DBQ May 27, 22:35 UTCMay 27, 23:50 UTC1h 15m
2026-05-27 N28MK DBQ → DBQ May 27, 17:10 UTCMay 27, 20:35 UTC3h 25m
2026-05-26 N28MK DBQ → DBQ May 26, 20:50 UTCMay 26, 22:15 UTC1h 25m
2026-05-26 N28MK DBQ → DBQ May 26, 18:45 UTCMay 26, 19:45 UTC1h 0m
2026-05-26 N28MK DBQ → DBQ May 26, 16:24 UTCMay 26, 17:25 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 N28MK page for operator, model, and routing details .

Mode-S A2CCBF frequently asked

What is Mode-S code A2CCBF?
A2CCBF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N28MK.
Where is Mode-S A2CCBF registered?
Mode-S code A2CCBF 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 A2CCBF broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2CCBF, octal 50546277, decimal 10,669,247.
What flights does A2CCBF operate?
Mode-S A2CCBF has broadcast 1 distinct callsign, including N28MK.