Apparatus

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sensors Mode-S transponder

A05815

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N121GX · REMOS GX · operated by SALE REPORTED

Hex
A05815
Octal
50054025
Decimal
10,508,309
Country
US
Tail
N121GX
Type
GX
No current signal · last broadcast 4h ago
Flights observed
69
Distinct callsigns
1
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S A05815.

Country allocation

The ICAO 24-bit address A05815 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
N121GX - 69 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 N121GX AUZ → AUZ Jul 18, 15:10 UTCJul 18, 15:30 UTC20m
2026-07-15 N121GX AUZ → AUZ Jul 15, 14:45 UTCJul 15, 16:25 UTC1h 40m
2026-07-15 N121GX - Jul 15, 13:10 UTCJul 15, 13:55 UTC45m
2026-07-14 N121GX AUZ → AUZ Jul 14, 23:10 UTCJul 15, 00:00 UTC50m
2026-07-14 N121GX - Jul 14, 20:05 UTCJul 14, 20:40 UTC35m
2026-07-14 N121GX AUZ → AUZ Jul 14, 14:55 UTCJul 14, 15:05 UTC10m
2026-07-13 N121GX AUZ → AUZ Jul 13, 23:05 UTCJul 13, 23:20 UTC15m
2026-07-11 N121GX - Jul 11, 15:55 UTCJul 11, 16:20 UTC25m
2026-07-11 N121GX - Jul 11, 14:25 UTCJul 11, 14:55 UTC30m
2026-07-11 N121GX AUZ → AUZ Jul 11, 12:45 UTCJul 11, 13:15 UTC30m
2026-07-11 N121GX AUZ → AUZ Jul 11, 11:35 UTCJul 11, 12:05 UTC30m
2026-07-10 N121GX AUZ → AUZ Jul 10, 22:45 UTCJul 10, 23:00 UTC15m
2026-07-10 N121GX - Jul 10, 20:20 UTCJul 10, 20:45 UTC25m
2026-07-10 N121GX - Jul 10, 16:50 UTCJul 10, 17:45 UTC55m
2026-07-10 N121GX AUZ → AUZ Jul 10, 15:15 UTCJul 10, 15:50 UTC35m
2026-07-09 N121GX AUZ → AUZ Jul 9, 20:50 UTCJul 9, 21:45 UTC55m
2026-07-09 N121GX AUZ → AUZ Jul 9, 16:35 UTCJul 9, 17:25 UTC50m
2026-07-08 N121GX AUZ → AUZ Jul 8, 23:35 UTCJul 9, 00:10 UTC35m
2026-07-08 N121GX - Jul 8, 21:25 UTCJul 8, 22:05 UTC40m
2026-07-08 N121GX AUZ → AUZ Jul 8, 17:20 UTCJul 8, 18:10 UTC50m
2026-07-08 N121GX - Jul 8, 15:35 UTCJul 8, 16:45 UTC1h 10m
2026-07-08 N121GX AUZ → AUZ Jul 8, 13:15 UTCJul 8, 14:10 UTC55m
2026-07-07 N121GX AUZ → AUZ Jul 7, 23:40 UTCJul 8, 00:00 UTC20m
2026-07-07 N121GX - Jul 7, 21:10 UTCJul 7, 22:15 UTC1h 5m
2026-07-07 N121GX AUZ → AUZ Jul 7, 19:45 UTCJul 7, 20:35 UTC50m
2026-07-07 N121GX - Jul 7, 15:30 UTCJul 7, 16:35 UTC1h 5m
2026-07-07 N121GX - Jul 7, 13:10 UTCJul 7, 13:55 UTC45m
2026-07-06 N121GX - Jul 6, 22:55 UTCJul 6, 23:50 UTC55m
2026-07-06 N121GX AUZ → AUZ Jul 6, 20:40 UTCJul 6, 21:10 UTC30m
2026-07-05 N121GX AUZ → AUZ Jul 5, 13:20 UTCJul 5, 14:25 UTC1h 5m
2026-07-05 N121GX - Jul 5, 02:20 UTCJul 5, 03:05 UTC45m
2026-07-03 N121GX - Jul 3, 16:25 UTCJul 3, 16:50 UTC25m
2026-07-01 N121GX AUZ → AUZ Jul 1, 17:50 UTCJul 1, 18:40 UTC50m
2026-07-01 N121GX - Jul 1, 13:40 UTCJul 1, 14:55 UTC1h 15m
2026-06-30 N121GX - Jun 30, 22:55 UTCJun 30, 23:30 UTC35m
2026-06-30 N121GX - Jun 30, 20:15 UTCJun 30, 20:55 UTC40m
2026-06-30 N121GX AUZ → AUZ Jun 30, 17:30 UTCJun 30, 18:25 UTC55m
2026-06-29 N121GX AUZ → AUZ Jun 29, 12:00 UTCJun 29, 12:09 UTC10m
2026-06-26 N121GX - Jun 26, 14:19 UTCJun 26, 14:55 UTC35m
2026-06-25 N121GX - Jun 25, 20:19 UTCJun 25, 20:39 UTC20m
2026-06-25 N121GX - Jun 25, 15:59 UTCJun 25, 16:50 UTC50m
2026-06-23 N121GX - Jun 23, 20:24 UTCJun 23, 20:59 UTC35m
2026-06-23 N121GX - Jun 23, 18:34 UTCJun 23, 19:44 UTC1h 10m
2026-06-22 N121GX - Jun 22, 18:54 UTCJun 22, 19:44 UTC50m
2026-06-22 N121GX AUZ → AUZ Jun 22, 17:29 UTCJun 22, 18:04 UTC35m
2026-06-22 N121GX - Jun 22, 11:44 UTCJun 22, 11:54 UTC10m
2026-06-20 N121GX AUZ → AUZ Jun 20, 18:14 UTCJun 20, 18:49 UTC35m
2026-06-20 N121GX AUZ → AUZ Jun 20, 16:19 UTCJun 20, 16:49 UTC30m
2026-06-20 N121GX - Jun 20, 13:44 UTCJun 20, 13:59 UTC15m
2026-06-20 N121GX AUZ → AUZ Jun 20, 11:25 UTCJun 20, 11:49 UTC25m

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 N121GX page for operator, model, and routing details .

Mode-S A05815 frequently asked

What is Mode-S code A05815?
A05815 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N121GX.
Where is Mode-S A05815 registered?
Mode-S code A05815 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 A05815 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A05815, octal 50054025, decimal 10,508,309.
What flights does A05815 operate?
Mode-S A05815 has broadcast 1 distinct callsign, including N121GX.