Apparatus

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sensors Mode-S transponder

A0C99F

ICAO 24-bit transponder address · allocated to United States

Hex
A0C99F
Octal
50144637
Decimal
10,537,375
Country
US
No current signal · last broadcast 6d ago
Flights observed
49
Distinct callsigns
1
Country
US
Last broadcast
6d ago

Last known position

Most recent position reported by Mode-S A0C99F.

Country allocation

The ICAO 24-bit address A0C99F 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
N15UG - 49 2026-07-18

Recent flights last 49

DateFlightRouteTakeoffLandingDuration
2026-07-18 N15UG TMB → TMB Jul 18, 12:25 UTCJul 18, 13:25 UTC1h 0m
2026-07-11 N15UG TMB → TMB Jul 11, 00:55 UTCJul 11, 01:25 UTC30m
2026-07-03 N15UG TMB → TMB Jul 3, 20:15 UTCJul 3, 20:50 UTC35m
2026-07-03 N15UG TMB → TMB Jul 3, 00:20 UTCJul 3, 01:15 UTC55m
2026-06-29 N15UG - Jun 29, 15:30 UTCJun 29, 17:19 UTC1h 50m
2026-06-28 N15UG TMB → MLB Jun 28, 12:55 UTCJun 28, 14:19 UTC1h 25m
2026-06-27 N15UG TMB → TMB Jun 27, 00:50 UTCJun 27, 01:49 UTC1h 0m
2026-06-24 N15UG - Jun 24, 15:44 UTCJun 24, 16:54 UTC1h 10m
2026-06-23 N15UG - Jun 23, 18:25 UTCJun 23, 20:19 UTC1h 55m
2026-06-22 N15UG - Jun 22, 20:04 UTCJun 22, 20:24 UTC20m
2026-06-22 N15UG - Jun 22, 16:45 UTCJun 22, 18:04 UTC1h 20m
2026-06-22 N15UG - Jun 22, 13:05 UTCJun 22, 14:19 UTC1h 15m
2026-06-21 N15UG - Jun 21, 15:15 UTCJun 21, 16:14 UTC1h 0m
2026-06-13 N15UG TMB → TMB Jun 13, 16:00 UTCJun 13, 18:05 UTC2h 5m
2026-06-11 N15UG - Jun 11, 22:40 UTCJun 11, 23:00 UTC20m
2026-06-11 N15UG - Jun 11, 14:45 UTCJun 11, 15:20 UTC35m
2026-06-10 N15UG - Jun 10, 16:40 UTCJun 10, 18:05 UTC1h 25m
2026-06-10 N15UG - Jun 10, 11:00 UTCJun 10, 12:15 UTC1h 15m
2026-06-09 N15UG - Jun 9, 16:45 UTCJun 9, 17:15 UTC30m
2026-06-09 N15UG - Jun 9, 15:30 UTCJun 9, 15:50 UTC20m
2026-06-09 N15UG TMB → FMY Jun 9, 11:40 UTCJun 9, 12:50 UTC1h 10m
2026-06-08 N15UG TMB → TMB Jun 8, 20:55 UTCJun 8, 22:10 UTC1h 15m
2026-06-05 N15UG TMB → TMB Jun 5, 12:40 UTCJun 5, 13:50 UTC1h 10m
2026-06-03 N15UG - Jun 3, 14:40 UTCJun 3, 15:10 UTC30m
2026-06-03 N15UG - Jun 3, 12:25 UTCJun 3, 14:00 UTC1h 35m
2026-06-03 N15UG TMB → TMB Jun 3, 01:30 UTCJun 3, 02:05 UTC35m
2026-05-26 N15UG - May 26, 17:04 UTCMay 26, 18:30 UTC1h 25m
2026-05-26 N15UG - May 26, 14:09 UTCMay 26, 15:20 UTC1h 10m
2026-05-25 N15UG TMB → TMB May 25, 20:59 UTCMay 25, 22:40 UTC1h 40m
2026-05-25 N15UG TMB → TMB May 25, 14:05 UTCMay 25, 14:55 UTC50m
2026-05-21 N15UG TMB → TMB May 21, 17:10 UTCMay 21, 18:25 UTC1h 15m
2026-05-20 N15UG TMB → TMB May 20, 23:20 UTCMay 21, 00:30 UTC1h 10m
2026-05-20 N15UG TMB → TMB May 20, 21:10 UTCMay 20, 21:50 UTC40m
2026-05-20 N15UG TMB → TMB May 20, 12:00 UTCMay 20, 13:35 UTC1h 35m
2026-05-19 N15UG TMB → TMB May 19, 23:35 UTCMay 20, 01:00 UTC1h 25m
2026-05-18 N15UG TMB → TMB May 18, 23:15 UTCMay 19, 01:10 UTC1h 55m
2026-05-18 N15UG TMB → TMB May 18, 14:40 UTCMay 18, 17:00 UTC2h 20m
2026-05-16 N15UG TMB → TMB May 16, 23:05 UTCMay 16, 23:15 UTC10m
2026-05-16 N15UG - May 16, 17:10 UTCMay 16, 17:40 UTC30m
2026-05-16 N15UG - May 16, 15:16 UTCMay 16, 16:35 UTC1h 20m
2026-05-15 N15UG TMB → TMB May 15, 11:40 UTCMay 15, 13:00 UTC1h 20m
2026-05-14 N15UG - May 14, 23:55 UTCMay 15, 00:45 UTC50m
2026-05-14 N15UG - May 14, 16:40 UTCMay 14, 19:15 UTC2h 35m
2026-05-13 N15UG - May 13, 23:40 UTCMay 14, 00:30 UTC50m
2026-05-13 N15UG - May 13, 14:30 UTCMay 13, 16:30 UTC2h 0m
2026-05-08 N15UG TMB → TMB May 8, 22:35 UTCMay 8, 23:05 UTC30m
2026-05-08 N15UG TMB → TMB May 8, 17:20 UTCMay 8, 18:50 UTC1h 30m
2026-05-07 N15UG TMB → TMB May 7, 23:34 UTCMay 7, 23:45 UTC10m
2026-05-07 N15UG TMB → TMB May 7, 15:00 UTCMay 7, 15:50 UTC50m

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.

Mode-S A0C99F frequently asked

What is Mode-S code A0C99F?
A0C99F is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S A0C99F registered?
Mode-S code A0C99F 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 A0C99F broadcasting right now?
No active broadcast right now. Last signal was 6d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0C99F, octal 50144637, decimal 10,537,375.
What flights does A0C99F operate?
Mode-S A0C99F has broadcast 1 distinct callsign, including N15UG.