Apparatus

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sensors Mode-S transponder

C81E00

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-GNF · Grob G103 Twin II

Hex
C81E00
Octal
62017000
Decimal
13,114,880
Country
NZ
Tail
ZK-GNF
Type
GLID
No current signal · last broadcast Jul 25, 03:45 UTC
Flights observed
40
Distinct callsigns
1
Country
NZ
Last broadcast
Jul 25, 03:45 UTC

Last known position

Most recent position reported by Mode-S C81E00.

Country allocation

The ICAO 24-bit address C81E00 falls within the block assigned to New Zealand (NZ) by ICAO Annex 10, Volume III. Every aircraft registered in New Zealand 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
ZKGNF - 40 2026-07-25

Recent flights last 40

DateFlightRouteTakeoffLandingDuration
2026-07-25 ZKGNF - Jul 25, 03:15 UTCJul 25, 03:45 UTC30m
2026-07-25 ZKGNF - Jul 25, 01:10 UTCJul 25, 02:10 UTC1h 0m
2026-07-18 ZKGNF - Jul 18, 00:29 UTCJul 18, 01:54 UTC1h 25m
2026-07-17 ZKGNF - Jul 17, 23:00 UTCJul 17, 23:39 UTC40m
2026-07-12 ZKGNF - Jul 12, 03:01 UTCJul 12, 04:20 UTC1h 20m
2026-07-12 ZKGNF - Jul 12, 00:45 UTCJul 12, 01:35 UTC50m
2026-07-11 ZKGNF - Jul 11, 01:45 UTCJul 11, 02:30 UTC45m
2026-07-11 ZKGNF - Jul 11, 00:10 UTCJul 11, 00:55 UTC45m
2026-07-10 ZKGNF - Jul 10, 01:15 UTCJul 10, 02:35 UTC1h 20m
2026-07-10 ZKGNF - Jul 10, 00:15 UTCJul 10, 00:35 UTC20m
2026-07-05 ZKGNF - Jul 5, 00:00 UTCJul 5, 01:50 UTC1h 50m
2026-07-04 ZKGNF - Jul 4, 01:35 UTCJul 4, 02:15 UTC40m
2026-07-04 ZKGNF - Jul 4, 00:45 UTCJul 4, 01:00 UTC15m
2026-06-28 ZKGNF - Jun 28, 02:54 UTCJun 28, 03:05 UTC10m
2026-06-28 ZKGNF - Jun 28, 02:05 UTCJun 28, 02:20 UTC15m
2026-06-28 ZKGNF - Jun 28, 00:35 UTCJun 28, 01:10 UTC35m
2026-06-20 ZKGNF - Jun 20, 03:14 UTCJun 20, 03:54 UTC40m
2026-06-20 ZKGNF - Jun 20, 02:00 UTCJun 20, 02:14 UTC15m
2026-06-20 ZKGNF - Jun 20, 00:24 UTCJun 20, 01:19 UTC55m
2026-06-13 ZKGNF - Jun 13, 00:50 UTCJun 13, 04:35 UTC3h 44m
2026-06-06 ZKGNF - Jun 6, 23:19 UTCJun 7, 02:55 UTC3h 35m
2026-05-30 ZKGNF - May 30, 01:15 UTCMay 30, 02:20 UTC1h 5m
2026-05-29 ZKGNF - May 29, 23:55 UTCMay 30, 00:40 UTC45m
2026-05-24 ZKGNF - May 24, 02:05 UTCMay 24, 02:40 UTC35m
2026-05-17 ZKGNF - May 17, 01:20 UTCMay 17, 02:40 UTC1h 20m
2026-05-16 ZKGNF - May 16, 01:55 UTCMay 16, 02:10 UTC15m
2026-05-10 ZKGNF - May 10, 01:04 UTCMay 10, 03:20 UTC2h 15m
2026-05-09 ZKGNF - May 9, 23:05 UTCMay 10, 00:00 UTC55m
2026-05-03 ZKGNF - May 3, 02:45 UTCMay 3, 03:35 UTC49m
2026-05-03 ZKGNF - May 3, 00:20 UTCMay 3, 01:35 UTC1h 15m
2026-05-02 ZKGNF - May 2, 03:40 UTCMay 2, 04:30 UTC50m
2026-05-02 ZKGNF - May 2, 00:25 UTCMay 2, 03:00 UTC2h 35m
2026-04-26 ZKGNF - Apr 26, 00:55 UTCApr 26, 03:35 UTC2h 40m
2026-04-25 ZKGNF - Apr 25, 23:35 UTCApr 25, 23:50 UTC15m
2026-04-25 ZKGNF - Apr 25, 00:05 UTCApr 25, 04:10 UTC4h 5m
2026-04-19 ZKGNF - Apr 19, 01:20 UTCApr 19, 02:55 UTC1h 35m
2026-04-19 ZKGNF - Apr 19, 00:00 UTCApr 19, 00:30 UTC30m
2026-04-18 ZKGNF - Apr 18, 01:40 UTCApr 18, 01:55 UTC15m
2026-04-18 ZKGNF - Apr 18, 00:45 UTCApr 18, 01:05 UTC20m
2026-04-17 ZKGNF - Apr 17, 23:55 UTCApr 18, 00:10 UTC15m

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 ZK-GNF page for operator, model, and routing details .

Mode-S C81E00 frequently asked

What is Mode-S code C81E00?
C81E00 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-GNF.
Where is Mode-S C81E00 registered?
Mode-S code C81E00 is allocated to New Zealand (NZ). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is C81E00 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 03:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81E00, octal 62017000, decimal 13,114,880.
What flights does C81E00 operate?
Mode-S C81E00 has broadcast 1 distinct callsign, including ZKGNF.