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 Jul 26, 20:45 UTC
Flights observed
92
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 20:45 UTC

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 - 92 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N121GX - Jul 26, 20:25 UTCJul 26, 20:45 UTC20m
2026-07-26 N121GX - Jul 26, 18:25 UTCJul 26, 19:00 UTC35m
2026-07-26 N121GX AUZ → AUZ Jul 26, 15:45 UTCJul 26, 16:25 UTC40m
2026-07-25 N121GX - Jul 25, 16:20 UTCJul 25, 16:45 UTC25m
2026-07-25 N121GX - Jul 25, 13:00 UTCJul 25, 13:25 UTC25m
2026-07-24 N121GX - Jul 24, 20:50 UTCJul 24, 21:45 UTC55m
2026-07-24 N121GX - Jul 24, 17:15 UTCJul 24, 18:00 UTC45m
2026-07-24 N121GX AUZ → AUZ Jul 24, 15:10 UTCJul 24, 15:50 UTC40m
2026-07-24 N121GX AUZ → AUZ Jul 24, 13:00 UTCJul 24, 13:45 UTC45m
2026-07-23 N121GX AUZ → AUZ Jul 23, 21:05 UTCJul 23, 23:05 UTC2h 0m
2026-07-23 N121GX - Jul 23, 19:30 UTCJul 23, 20:15 UTC45m
2026-07-23 N121GX AUZ → AUZ Jul 23, 17:25 UTCJul 23, 18:30 UTC1h 5m
2026-07-23 N121GX AUZ → AUZ Jul 23, 15:25 UTCJul 23, 16:00 UTC35m
2026-07-22 N121GX - Jul 22, 18:55 UTCJul 22, 19:20 UTC25m
2026-07-22 N121GX - Jul 22, 17:00 UTCJul 22, 18:05 UTC1h 5m
2026-07-22 N121GX AUZ → AUZ Jul 22, 14:50 UTCJul 22, 16:05 UTC1h 15m
2026-07-22 N121GX AUZ → AUZ Jul 22, 13:25 UTCJul 22, 14:00 UTC35m
2026-07-22 N121GX AUZ → AUZ Jul 22, 11:40 UTCJul 22, 12:25 UTC45m
2026-07-21 N121GX - Jul 21, 23:00 UTCJul 21, 23:55 UTC55m
2026-07-21 N121GX AUZ → AUZ Jul 21, 19:05 UTCJul 21, 19:55 UTC50m
2026-07-21 N121GX - Jul 21, 16:40 UTCJul 21, 17:20 UTC40m
2026-07-21 N121GX - Jul 21, 13:35 UTCJul 21, 14:45 UTC1h 10m
2026-07-20 N121GX AUZ → AUZ Jul 20, 14:25 UTCJul 20, 16:20 UTC1h 55m
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

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 Jul 26, 20:45 UTC.
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.