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sensors Mode-S transponder

7C203D

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-GNJ · Northrop Primary · operated by UNIVERSITY OF NEW SOUTH WALES

Hex
7C203D
Octal
37020075
Decimal
8,134,717
Country
AU
Tail
VH-GNJ
Type
GLID
No current signal · last broadcast Jul 26, 04:30 UTC
Flights observed
103
Distinct callsigns
1
Country
AU
Last broadcast
Jul 26, 04:30 UTC

Last known position

Most recent position reported by Mode-S 7C203D.

Country allocation

The ICAO 24-bit address 7C203D falls within the block assigned to Australia (AU) by ICAO Annex 10, Volume III. Every aircraft registered in Australia 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
GNJ - 103 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 GNJ - Jul 26, 02:50 UTCJul 26, 04:25 UTC1h 35m
2026-07-26 GNJ - Jul 26, 00:30 UTCJul 26, 01:05 UTC35m
2026-07-25 GNJ - Jul 25, 00:45 UTCJul 25, 01:45 UTC1h 0m
2026-07-24 GNJ - Jul 24, 23:50 UTCJul 25, 00:15 UTC25m
2026-07-23 GNJ BWU → BWU Jul 23, 23:15 UTCJul 24, 01:15 UTC2h 0m
2026-07-23 GNJ BWU → BWU Jul 23, 01:35 UTCJul 23, 03:30 UTC1h 55m
2026-07-22 GNJ BWU → BWU Jul 22, 23:10 UTCJul 22, 23:50 UTC40m
2026-07-22 GNJ - Jul 22, 00:05 UTCJul 22, 00:25 UTC20m
2026-07-21 GNJ - Jul 21, 23:05 UTCJul 21, 23:30 UTC25m
2026-07-21 GNJ BWU → BWU Jul 21, 01:25 UTCJul 21, 03:45 UTC2h 20m
2026-07-20 GNJ BWU → BWU Jul 20, 08:40 UTCJul 20, 10:50 UTC2h 10m
2026-07-20 GNJ BWU → BWU Jul 20, 04:15 UTCJul 20, 05:40 UTC1h 25m
2026-07-19 GNJ BWU → BWU Jul 19, 04:45 UTCJul 19, 05:55 UTC1h 10m
2026-07-18 GNJ BWU → BWU Jul 18, 23:55 UTCJul 19, 02:30 UTC2h 35m
2026-07-18 GNJ - Jul 18, 01:10 UTCJul 18, 01:39 UTC30m
2026-07-18 GNJ - Jul 18, 00:00 UTCJul 18, 00:25 UTC25m
2026-07-15 GNJ BWU → BWU Jul 15, 08:15 UTCJul 15, 09:45 UTC1h 30m
2026-07-15 GNJ - Jul 15, 04:25 UTCJul 15, 05:15 UTC50m
2026-07-15 GNJ - Jul 15, 01:40 UTCJul 15, 02:15 UTC35m
2026-07-11 GNJ CES → BWU Jul 11, 03:01 UTCJul 11, 04:01 UTC1h 0m
2026-07-11 GNJ - Jul 11, 01:30 UTCJul 11, 02:15 UTC45m
2026-07-09 GNJ BWU → BWU Jul 9, 03:15 UTCJul 9, 03:45 UTC30m
2026-07-08 GNJ BWU → BWU Jul 8, 03:50 UTCJul 8, 05:00 UTC1h 10m
2026-07-01 GNJ BWU → BWU Jul 1, 08:30 UTCJul 1, 09:25 UTC55m
2026-07-01 GNJ BWU → BWU Jul 1, 05:00 UTCJul 1, 06:05 UTC1h 5m
2026-06-30 GNJ BWU → BWU Jun 30, 03:25 UTCJun 30, 06:15 UTC2h 50m
2026-06-29 GNJ BWU → BWU Jun 29, 07:50 UTCJun 29, 08:39 UTC50m
2026-06-29 GNJ BWU → BWU Jun 29, 02:50 UTCJun 29, 03:05 UTC15m
2026-06-21 GNJ - Jun 21, 05:30 UTCJun 21, 05:59 UTC30m
2026-06-21 GNJ - Jun 21, 03:40 UTCJun 21, 04:10 UTC30m
2026-06-21 GNJ BWU → BWU Jun 21, 00:29 UTCJun 21, 01:25 UTC55m
2026-06-20 GNJ BWU → BWU Jun 20, 01:19 UTCJun 20, 02:44 UTC1h 25m
2026-06-20 GNJ BWU → BWU Jun 20, 00:09 UTCJun 20, 00:29 UTC20m
2026-06-19 GNJ BWU → BWU Jun 19, 23:04 UTCJun 19, 23:54 UTC50m
2026-06-17 GNJ BWU → BWU Jun 17, 03:20 UTCJun 17, 05:25 UTC2h 5m
2026-06-16 GNJ BWU → BWU Jun 16, 22:55 UTCJun 17, 01:20 UTC2h 25m
2026-06-16 GNJ - Jun 16, 09:45 UTCJun 16, 10:25 UTC40m
2026-06-16 GNJ BWU → BWU Jun 16, 07:34 UTCJun 16, 09:10 UTC1h 35m
2026-06-16 GNJ - Jun 16, 05:55 UTCJun 16, 06:35 UTC40m
2026-06-16 GNJ - Jun 16, 04:35 UTCJun 16, 05:20 UTC45m
2026-06-16 GNJ - Jun 16, 02:09 UTCJun 16, 03:04 UTC55m
2026-06-16 GNJ - Jun 16, 00:29 UTCJun 16, 01:04 UTC35m
2026-06-14 GNJ - Jun 14, 01:30 UTCJun 14, 02:25 UTC55m
2026-06-13 GNJ BWU → CES Jun 13, 23:50 UTCJun 14, 00:50 UTC1h 0m
2026-06-13 GNJ BWU → BWU Jun 13, 03:50 UTCJun 13, 06:05 UTC2h 14m
2026-06-11 GNJ BWU → BWU Jun 11, 23:55 UTCJun 12, 00:20 UTC25m
2026-06-10 GNJ - Jun 10, 01:30 UTCJun 10, 02:05 UTC35m
2026-06-09 GNJ - Jun 9, 23:55 UTCJun 10, 00:25 UTC30m
2026-06-09 GNJ BWU → BWU Jun 9, 04:05 UTCJun 9, 05:55 UTC1h 50m
2026-06-09 GNJ - Jun 9, 00:50 UTCJun 9, 02:05 UTC1h 15m

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 VH-GNJ page for operator, model, and routing details .

Mode-S 7C203D frequently asked

What is Mode-S code 7C203D?
7C203D is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-GNJ.
Where is Mode-S 7C203D registered?
Mode-S code 7C203D is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C203D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 04:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C203D, octal 37020075, decimal 8,134,717.
What flights does 7C203D operate?
Mode-S 7C203D has broadcast 1 distinct callsign, including GNJ.