Apparatus

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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 1d ago
Flights observed
43
Distinct callsigns
1
Country
AU
Last broadcast
1d ago

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 - 43 2026-06-01

Recent flights last 43

DateFlightRouteTakeoffLandingDuration
2026-06-01 GNJ BWU → BWU Jun 1, 03:10 UTCJun 1, 05:10 UTC2h 0m
2026-06-01 GNJ - Jun 1, 00:35 UTCJun 1, 01:45 UTC1h 10m
2026-05-31 GNJ - May 31, 23:20 UTCJun 1, 00:00 UTC40m
2026-05-30 GNJ BWU → BWU May 30, 23:25 UTCMay 31, 00:20 UTC55m
2026-05-30 GNJ BWU → BWU May 30, 02:20 UTCMay 30, 04:25 UTC2h 5m
2026-05-21 GNJ - May 21, 04:10 UTCMay 21, 04:45 UTC35m
2026-05-21 GNJ - May 21, 03:15 UTCMay 21, 03:30 UTC15m
2026-05-21 GNJ - May 21, 01:15 UTCMay 21, 02:05 UTC50m
2026-05-20 GNJ BWU → BWU May 20, 23:00 UTCMay 20, 23:20 UTC20m
2026-05-20 GNJ - May 20, 03:55 UTCMay 20, 05:20 UTC1h 26m
2026-05-20 GNJ - May 20, 01:40 UTCMay 20, 02:55 UTC1h 15m
2026-05-12 GNJ - May 12, 02:45 UTCMay 12, 03:25 UTC40m
2026-05-11 GNJ BWU → BWU May 11, 02:10 UTCMay 11, 03:15 UTC1h 5m
2026-05-10 GNJ - May 10, 04:25 UTCMay 10, 05:10 UTC45m
2026-05-10 GNJ - May 10, 03:00 UTCMay 10, 03:45 UTC45m
2026-05-10 GNJ BWU → BWU May 10, 00:24 UTCMay 10, 02:14 UTC1h 50m
2026-05-09 GNJ BWU → BWU May 9, 03:15 UTCMay 9, 04:45 UTC1h 30m
2026-05-08 GNJ BWU → BWU May 8, 23:15 UTCMay 9, 01:25 UTC2h 10m
2026-05-06 GNJ BWU → BWU May 6, 04:20 UTCMay 6, 05:15 UTC55m
2026-05-06 GNJ BWU → BWU May 6, 00:05 UTCMay 6, 00:40 UTC35m
2026-05-05 GNJ BWU → BWU May 5, 09:30 UTCMay 5, 11:10 UTC1h 40m
2026-05-05 GNJ BWU → BWU May 5, 08:00 UTCMay 5, 08:15 UTC15m
2026-05-05 GNJ BWU → BWU May 5, 03:05 UTCMay 5, 03:35 UTC30m
2026-05-01 GNJ BWU → BWU May 1, 22:40 UTCMay 1, 23:05 UTC25m
2026-05-01 GNJ - May 1, 05:00 UTCMay 1, 05:25 UTC25m
2026-05-01 GNJ - May 1, 03:30 UTCMay 1, 04:25 UTC55m
2026-04-26 GNJ - Apr 26, 01:35 UTCApr 26, 02:05 UTC30m
2026-04-26 GNJ - Apr 26, 00:00 UTCApr 26, 01:00 UTC1h 0m
2026-04-24 GNJ - Apr 24, 02:00 UTCApr 24, 02:45 UTC45m
2026-04-24 GNJ - Apr 24, 00:45 UTCApr 24, 01:30 UTC45m
2026-04-23 GNJ BWU → BWU Apr 23, 04:20 UTCApr 23, 05:40 UTC1h 21m
2026-04-22 GNJ BWU → BWU Apr 22, 04:55 UTCApr 22, 05:10 UTC15m
2026-04-22 GNJ BWU → BWU Apr 22, 04:10 UTCApr 22, 04:45 UTC35m
2026-04-22 GNJ BWU → BWU Apr 22, 00:35 UTCApr 22, 02:10 UTC1h 35m
2026-04-21 GNJ BWU → BWU Apr 21, 04:35 UTCApr 21, 05:50 UTC1h 15m
2026-04-18 GNJ - Apr 18, 03:25 UTCApr 18, 04:05 UTC40m
2026-04-18 GNJ - Apr 18, 02:55 UTCApr 18, 03:20 UTC25m
2026-04-17 GNJ - Apr 17, 23:25 UTCApr 18, 00:30 UTC1h 5m
2026-04-17 GNJ - Apr 17, 23:05 UTCApr 17, 23:20 UTC15m
2026-04-15 GNJ WSI → BWU Apr 15, 05:00 UTCApr 15, 05:30 UTC30m
2026-04-15 GNJ - Apr 15, 04:10 UTCApr 15, 04:50 UTC40m
2026-04-14 GNJ - Apr 14, 23:45 UTCApr 15, 00:50 UTC1h 5m
2026-04-14 GNJ - Apr 14, 05:15 UTCApr 14, 06:30 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 1d ago.
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.