Apparatus

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sensors Mode-S transponder

A7BFF5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N599MM · operated by CIRRUS DESIGN CORP

Hex
A7BFF5
Octal
51737765
Decimal
10,993,653
Country
US
Tail
N599MM
Type
S22T
No current signal · last broadcast 11d ago
Flights observed
77
Distinct callsigns
1
Country
US
Last broadcast
11d ago

Last known position

Most recent position reported by Mode-S A7BFF5.

Country allocation

The ICAO 24-bit address A7BFF5 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
N599MM - 77 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 N599MM - Jul 23, 00:05 UTCJul 23, 00:20 UTC15m
2026-07-22 N599MM - Jul 22, 23:15 UTCJul 22, 23:55 UTC40m
2026-07-17 N599MM - Jul 17, 16:55 UTCJul 17, 17:20 UTC25m
2026-07-16 N599MM - Jul 16, 16:44 UTCJul 16, 17:05 UTC20m
2026-07-15 N599MM - Jul 15, 18:00 UTCJul 15, 19:20 UTC1h 20m
2026-07-09 N599MM - Jul 9, 21:25 UTCJul 9, 22:00 UTC35m
2026-07-09 N599MM - Jul 9, 19:45 UTCJul 9, 20:00 UTC15m
2026-07-09 N599MM - Jul 9, 17:45 UTCJul 9, 18:00 UTC15m
2026-07-09 N599MM - Jul 9, 16:10 UTCJul 9, 17:10 UTC1h 0m
2026-07-08 N599MM - Jul 8, 23:15 UTCJul 9, 00:05 UTC50m
2026-07-07 N599MM - Jul 7, 20:15 UTCJul 7, 22:15 UTC2h 0m
2026-07-02 N599MM - Jul 2, 19:45 UTCJul 2, 19:55 UTC10m
2026-07-02 N599MM - Jul 2, 18:20 UTCJul 2, 18:30 UTC10m
2026-07-01 N599MM - Jul 1, 03:40 UTCJul 1, 04:10 UTC30m
2026-06-20 N599MM - Jun 20, 16:44 UTCJun 20, 17:44 UTC1h 0m
2026-06-20 N599MM - Jun 20, 15:44 UTCJun 20, 16:09 UTC25m
2026-06-10 N599MM - Jun 10, 20:45 UTCJun 10, 22:50 UTC2h 5m
2026-06-10 N599MM - Jun 10, 15:55 UTCJun 10, 17:15 UTC1h 20m
2026-06-09 N599MM - Jun 9, 21:20 UTCJun 9, 22:30 UTC1h 10m
2026-06-09 N599MM - Jun 9, 19:55 UTCJun 9, 20:40 UTC45m
2026-06-06 N599MM - Jun 6, 20:45 UTCJun 6, 22:05 UTC1h 20m
2026-06-06 N599MM - Jun 6, 16:24 UTCJun 6, 17:44 UTC1h 20m
2026-06-05 N599MM - Jun 5, 20:50 UTCJun 5, 21:40 UTC50m
2026-06-05 N599MM - Jun 5, 17:45 UTCJun 5, 18:10 UTC25m
2026-06-04 N599MM - Jun 4, 17:10 UTCJun 4, 17:30 UTC20m
2026-06-04 N599MM - Jun 4, 16:00 UTCJun 4, 16:20 UTC20m
2026-06-03 N599MM - Jun 3, 21:40 UTCJun 3, 22:55 UTC1h 15m
2026-05-22 N599MM - May 22, 16:50 UTCMay 22, 17:00 UTC10m
2026-05-22 N599MM - May 22, 16:20 UTCMay 22, 16:30 UTC10m
2026-05-22 N599MM - May 22, 16:05 UTCMay 22, 16:10 UTC5m
2026-05-22 N599MM - May 22, 15:35 UTCMay 22, 15:40 UTC5m
2026-05-20 N599MM - May 20, 17:15 UTCMay 20, 17:45 UTC30m
2026-05-20 N599MM - May 20, 15:00 UTCMay 20, 15:25 UTC25m
2026-05-19 N599MM - May 19, 18:30 UTCMay 19, 19:30 UTC1h 0m
2026-05-17 N599MM - May 17, 18:35 UTCMay 17, 19:01 UTC25m
2026-05-17 N599MM - May 17, 17:30 UTCMay 17, 17:45 UTC15m
2026-05-17 N599MM - May 17, 16:30 UTCMay 17, 16:50 UTC20m
2026-05-16 N599MM - May 16, 22:05 UTCMay 16, 22:40 UTC35m
2026-05-16 N599MM - May 16, 15:55 UTCMay 16, 17:05 UTC1h 10m
2026-05-09 N599MM - May 9, 20:55 UTCMay 9, 23:00 UTC2h 5m
2026-05-06 N599MM - May 6, 20:10 UTCMay 6, 21:10 UTC1h 0m
2026-05-06 N599MM - May 6, 18:20 UTCMay 6, 19:20 UTC1h 0m
2026-05-06 N599MM - May 6, 17:20 UTCMay 6, 17:35 UTC14m
2026-05-05 N599MM - May 5, 20:50 UTCMay 5, 22:35 UTC1h 45m
2026-05-01 N599MM - May 1, 19:25 UTCMay 1, 21:00 UTC1h 35m
2026-04-29 N599MM - Apr 29, 22:00 UTCApr 29, 22:15 UTC15m
2026-04-28 N599MM - Apr 28, 15:25 UTCApr 28, 15:40 UTC15m
2026-04-27 N599MM - Apr 27, 21:25 UTCApr 27, 22:35 UTC1h 10m
2026-04-27 N599MM - Apr 27, 21:00 UTCApr 27, 21:20 UTC20m
2026-04-27 N599MM - Apr 27, 20:50 UTCApr 27, 20:55 UTC5m

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 N599MM page for operator, model, and routing details .

Mode-S A7BFF5 frequently asked

What is Mode-S code A7BFF5?
A7BFF5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N599MM.
Where is Mode-S A7BFF5 registered?
Mode-S code A7BFF5 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 A7BFF5 broadcasting right now?
No active broadcast right now. Last signal was 11d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A7BFF5, octal 51737765, decimal 10,993,653.
What flights does A7BFF5 operate?
Mode-S A7BFF5 has broadcast 1 distinct callsign, including N599MM.