Apparatus

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sensors Mode-S transponder

A2C125

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N277GT · CESSNA 172 Skyhawk · operated by SVETFUR AVIATION LLC

Hex
A2C125
Octal
50540445
Decimal
10,666,277
Country
US
Tail
N277GT
Type
C172
No current signal · last broadcast 9h ago
Flights observed
84
Distinct callsigns
1
Country
US
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S A2C125.

Country allocation

The ICAO 24-bit address A2C125 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
N277GT - 84 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 N277GT TTN → TTN Jul 17, 20:50 UTCJul 17, 21:55 UTC1h 5m
2026-07-15 N277GT - Jul 15, 14:40 UTCJul 15, 15:05 UTC25m
2026-07-14 N277GT DYL → TTN Jul 14, 22:05 UTCJul 14, 22:25 UTC20m
2026-07-14 N277GT - Jul 14, 21:25 UTCJul 14, 22:00 UTC35m
2026-07-14 N277GT - Jul 14, 17:50 UTCJul 14, 19:15 UTC1h 25m
2026-07-14 N277GT - Jul 14, 15:50 UTCJul 14, 17:00 UTC1h 10m
2026-07-14 N277GT TTN → TTN Jul 14, 10:35 UTCJul 14, 14:40 UTC4h 5m
2026-07-13 N277GT - Jul 13, 19:10 UTCJul 13, 22:40 UTC3h 30m
2026-07-13 N277GT - Jul 13, 14:30 UTCJul 13, 15:20 UTC50m
2026-07-13 N277GT - Jul 13, 12:35 UTCJul 13, 13:40 UTC1h 5m
2026-07-13 N277GT - Jul 13, 11:20 UTCJul 13, 11:40 UTC20m
2026-07-12 N277GT - Jul 12, 22:40 UTCJul 13, 02:10 UTC3h 30m
2026-07-12 N277GT - Jul 12, 21:20 UTCJul 12, 21:30 UTC10m
2026-07-12 N277GT - Jul 12, 19:01 UTCJul 12, 19:55 UTC55m
2026-07-12 N277GT - Jul 12, 16:50 UTCJul 12, 17:30 UTC40m
2026-07-12 N277GT TTN → RDG Jul 12, 16:01 UTCJul 12, 16:40 UTC40m
2026-07-12 N277GT TTN → TTN Jul 12, 12:35 UTCJul 12, 14:40 UTC2h 5m
2026-07-11 N277GT - Jul 11, 14:20 UTCJul 11, 14:35 UTC15m
2026-07-11 N277GT - Jul 11, 10:45 UTCJul 11, 11:25 UTC40m
2026-07-10 N277GT - Jul 10, 15:50 UTCJul 10, 17:15 UTC1h 25m
2026-07-10 N277GT - Jul 10, 14:40 UTCJul 10, 15:10 UTC30m
2026-07-10 N277GT - Jul 10, 14:00 UTCJul 10, 14:30 UTC30m
2026-07-10 N277GT TTN → TTN Jul 10, 11:25 UTCJul 10, 13:00 UTC1h 35m
2026-07-09 N277GT - Jul 9, 00:30 UTCJul 9, 03:15 UTC2h 45m
2026-07-08 N277GT - Jul 8, 23:15 UTCJul 8, 23:25 UTC10m
2026-07-08 N277GT - Jul 8, 21:35 UTCJul 8, 22:25 UTC50m
2026-07-08 N277GT - Jul 8, 19:30 UTCJul 8, 20:30 UTC1h 0m
2026-07-08 N277GT TTN → TTN Jul 8, 16:10 UTCJul 8, 17:50 UTC1h 40m
2026-07-08 N277GT - Jul 8, 13:45 UTCJul 8, 14:30 UTC45m
2026-07-03 N277GT - Jul 3, 17:45 UTCJul 3, 18:35 UTC50m
2026-07-03 N277GT - Jul 3, 16:45 UTCJul 3, 17:35 UTC50m
2026-07-03 N277GT TTN → TTN Jul 3, 14:20 UTCJul 3, 15:50 UTC1h 30m
2026-07-03 N277GT - Jul 3, 10:25 UTCJul 3, 11:50 UTC1h 25m
2026-07-01 N277GT - Jul 1, 21:35 UTCJul 1, 23:20 UTC1h 45m
2026-07-01 N277GT - Jul 1, 12:00 UTCJul 1, 14:05 UTC2h 5m
2026-06-30 N277GT - Jun 30, 19:30 UTCJun 30, 20:25 UTC55m
2026-06-30 N277GT - Jun 30, 17:10 UTCJun 30, 17:45 UTC35m
2026-06-30 N277GT - Jun 30, 14:40 UTCJun 30, 15:45 UTC1h 5m
2026-06-30 N277GT - Jun 30, 11:25 UTCJun 30, 13:25 UTC2h 0m
2026-06-30 N277GT - Jun 30, 01:00 UTCJun 30, 05:35 UTC4h 36m
2026-06-29 N277GT - Jun 29, 23:39 UTCJun 30, 00:00 UTC20m
2026-06-29 N277GT - Jun 29, 19:49 UTCJun 29, 22:39 UTC2h 50m
2026-06-29 N277GT - Jun 29, 15:34 UTCJun 29, 17:49 UTC2h 15m
2026-06-29 N277GT - Jun 29, 12:34 UTCJun 29, 13:49 UTC1h 15m
2026-06-27 N277GT - Jun 27, 15:24 UTCJun 27, 16:30 UTC1h 5m
2026-06-26 N277GT - Jun 26, 19:55 UTCJun 26, 21:35 UTC1h 40m
2026-06-26 N277GT - Jun 26, 16:54 UTCJun 26, 18:44 UTC1h 50m
2026-06-25 N277GT TTN → TTN Jun 25, 19:39 UTCJun 25, 22:14 UTC2h 35m
2026-06-25 N277GT - Jun 25, 16:39 UTCJun 25, 18:39 UTC2h 0m
2026-06-25 N277GT - Jun 25, 14:04 UTCJun 25, 15:44 UTC1h 40m

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 N277GT page for operator, model, and routing details .

Mode-S A2C125 frequently asked

What is Mode-S code A2C125?
A2C125 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N277GT.
Where is Mode-S A2C125 registered?
Mode-S code A2C125 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 A2C125 broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2C125, octal 50540445, decimal 10,666,277.
What flights does A2C125 operate?
Mode-S A2C125 has broadcast 1 distinct callsign, including N277GT.