Apparatus

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sensors Mode-S transponder

A2C129

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N277GX · AIRBUS A-321 · operated by WILMINGTON TRUST CO TRUSTEE

Hex
A2C129
Octal
50540451
Decimal
10,666,281
Country
US
Tail
N277GX
Type
A321
No current signal · last broadcast 1d ago
Flights observed
98
Distinct callsigns
20
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A2C129.

Country allocation

The ICAO 24-bit address A2C129 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 20 distinct

Callsign Airline Flights Last seen
GXA6152 Grixona 6 2026-05-27
GXA6121 Grixona 6 2026-05-01
GXA6102 Grixona 6 2026-04-21
GXA6122 Grixona 5 2026-05-01
GXA6277 Grixona 4 2026-05-13
GXA6275 Grixona 4 2026-05-13
GXA6161 Grixona 4 2026-05-28
GXA6151 Grixona 4 2026-05-27
GXA6139 Grixona 4 2026-04-24
GXA6276 Grixona 3 2026-05-13
GXA6228 Grixona 3 2026-05-20
GXA6163 Grixona 3 2026-05-21
GXA6306 Grixona 2 2026-05-20
GXA6278 Grixona 2 2026-05-12
GXA6226 Grixona 2 2026-05-25
GXA6212 Grixona 2 2026-05-10
GXA6211 Grixona 2 2026-05-09
GXA6162 Grixona 2 2026-05-03
GXA6153 Grixona 2 2026-05-26
GXA6138 Grixona 2 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-28 GXA6161 HRL → TTN May 28, 13:25 UTCMay 28, 15:50 UTC2h 25m
2026-05-27 GXA6152 BED → BUF May 27, 14:50 UTCMay 27, 20:30 UTC5h 40m
2026-05-27 GXA6151 EWR → BED May 27, 12:00 UTCMay 27, 12:50 UTC50m
2026-05-26 GXA6153 EWR → BED May 26, 16:15 UTCMay 26, 18:19 UTC2h 5m
2026-05-26 GXA6152 BED → BUF May 26, 14:45 UTCMay 26, 14:55 UTC10m
2026-05-26 GXA6152 BED → BUF May 26, 11:44 UTCMay 26, 14:09 UTC2h 25m
2026-05-26 GXA6151 EWR → BED May 26, 09:09 UTCMay 26, 10:39 UTC1h 30m
2026-05-25 GXA6152 BED → BUF May 25, 17:25 UTCMay 25, 18:35 UTC1h 10m
2026-05-25 GXA6226 NKX → VSA May 25, 14:50 UTCMay 25, 15:55 UTC1h 5m
2026-05-24 GXA6156 EWR → BED May 24, 14:05 UTCMay 24, 15:15 UTC1h 10m
2026-05-22 GXA6118 HRL → BED May 22, 15:05 UTCMay 23, 01:55 UTC10h 50m
2026-05-22 GXA6138 AEX → SAL May 22, 11:55 UTCMay 22, 12:45 UTC50m
2026-05-21 GXA6109 MGA → AEX May 21, 15:55 UTCMay 21, 23:10 UTC7h 15m
2026-05-21 GXA6163 JAX → IAH May 21, 01:20 UTCMay 21, 01:50 UTC30m
2026-05-20 GXA6228 ELP → VSA May 20, 19:10 UTCMay 20, 22:35 UTC3h 25m
2026-05-20 GXA6306 HRL → NKX May 20, 14:40 UTCMay 20, 17:35 UTC2h 55m
2026-05-19 GXA6163 JAX → IAH May 19, 23:20 UTCMay 20, 00:30 UTC1h 10m
2026-05-19 GXA6228 ELP → VSA May 19, 19:30 UTCMay 19, 22:05 UTC2h 35m
2026-05-19 GXA6161 HRL → TTN May 19, 16:50 UTCMay 19, 18:15 UTC1h 25m
2026-05-18 GXA158 HRL → AZA May 18, 20:45 UTCMay 18, 23:05 UTC2h 20m
2026-05-14 GXA153 MIA → CVG May 14, 03:20 UTCMay 14, 04:10 UTC50m
2026-05-13 GXA6277 MIA → HRL May 13, 20:15 UTCMay 13, 23:05 UTC2h 50m
2026-05-13 GXA6276 AZA → OPF May 13, 13:15 UTCMay 13, 15:35 UTC2h 20m
2026-05-13 GXA6275 OPF → POS May 13, 07:20 UTCMay 13, 11:15 UTC3h 55m
2026-05-12 GXA6278 MIA → AZA May 12, 02:45 UTCMay 12, 06:05 UTC3h 20m
2026-05-11 GXA6277 MIA → HRL May 11, 19:15 UTCMay 11, 21:55 UTC2h 40m
2026-05-11 GXA6276 AZA → OPF May 11, 13:20 UTCMay 11, 15:45 UTC2h 25m
2026-05-11 GXA6275 OPF → POS May 11, 08:15 UTCMay 11, 12:00 UTC3h 45m
2026-05-10 GXA6213 ELP → AZA May 10, 21:44 UTCMay 10, 22:35 UTC50m
2026-05-10 GXA6212 BFI → ELP May 10, 03:50 UTCMay 10, 05:10 UTC1h 20m
2026-05-09 GXA6211 AZA → VCV May 9, 22:10 UTCMay 10, 00:45 UTC2h 35m
2026-05-09 GXA6210 AZA → DAL May 9, 17:49 UTCMay 9, 19:45 UTC1h 55m
2026-05-08 GXA6287 MIA → AZA May 8, 23:35 UTCMay 9, 04:15 UTC4h 40m
2026-05-08 GXA6277 MIA → HRL May 8, 12:44 UTCMay 8, 21:55 UTC9h 10m
2026-05-08 GXA6275 OPF → POS May 8, 07:50 UTCMay 8, 11:30 UTC3h 40m
2026-05-07 GXA6214 NKX → AZA May 7, 22:00 UTCMay 7, 22:54 UTC54m
2026-05-07 GXA6306 HRL → NKX May 7, 20:30 UTCMay 7, 21:00 UTC30m
2026-05-07 GXA6212 BFI → ELP May 7, 17:05 UTCMay 7, 18:40 UTC1h 35m
2026-05-07 GXA6211 AZA → VCV May 7, 14:15 UTCMay 7, 15:45 UTC1h 30m
2026-05-07 GXA6278 MIA → AZA May 7, 00:30 UTCMay 7, 05:10 UTC4h 40m
2026-05-06 GXA6277 MIA → HRL May 6, 19:10 UTCMay 6, 21:55 UTC2h 45m
2026-05-06 GXA6276 AZA → OPF May 6, 12:50 UTCMay 6, 15:10 UTC2h 20m
2026-05-06 GXA6275 OPF → POS May 6, 07:30 UTCMay 6, 11:00 UTC3h 30m
2026-05-06 GXA151 OAK → HRL May 6, 00:50 UTCMay 6, 03:15 UTC2h 25m
2026-05-05 GXA6153 EWR → BED May 5, 20:55 UTCMay 5, 23:00 UTC2h 5m
2026-05-05 GXA6152 BED → BUF May 5, 18:00 UTCMay 5, 18:15 UTC15m
2026-05-05 GXA6152 BED → BUF May 5, 15:10 UTCMay 5, 17:25 UTC2h 15m
2026-05-05 GXA6151 EWR → BED May 5, 09:35 UTCMay 5, 11:10 UTC1h 35m
2026-05-04 6152 - May 4, 20:00 UTCMay 4, 21:15 UTC1h 15m
2026-05-04 GXA6228 ELP → VSA May 4, 17:10 UTCMay 4, 18:20 UTC1h 10m

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 N277GX page for operator, model, and routing details .

Mode-S A2C129 frequently asked

What is Mode-S code A2C129?
A2C129 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N277GX.
Where is Mode-S A2C129 registered?
Mode-S code A2C129 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 A2C129 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2C129, octal 50540451, decimal 10,666,281.
What flights does A2C129 operate?
Mode-S A2C129 has broadcast 20 distinct callsigns, including GXA6152, GXA6121, GXA6102, GXA6122, GXA6277.