Apparatus

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sensors Mode-S transponder

C81FD1

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-NAV · CESSNA 172 Skyhawk

Hex
C81FD1
Octal
62017721
Decimal
13,115,345
Country
NZ
Tail
ZK-NAV
Type
C172
No current signal · last broadcast Jul 26, 21:50 UTC
Flights observed
97
Distinct callsigns
1
Country
NZ
Last broadcast
Jul 26, 21:50 UTC

Last known position

Most recent position reported by Mode-S C81FD1.

Country allocation

The ICAO 24-bit address C81FD1 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
ZKZAN - 97 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ZKZAN - Jul 26, 21:10 UTCJul 26, 21:50 UTC40m
2026-07-26 ZKZAN - Jul 26, 03:35 UTCJul 26, 04:00 UTC25m
2026-07-25 ZKZAN - Jul 25, 23:55 UTCJul 26, 00:10 UTC15m
2026-07-25 ZKZAN - Jul 25, 21:00 UTCJul 25, 21:35 UTC35m
2026-07-24 ZKZAN - Jul 24, 01:40 UTCJul 24, 02:50 UTC1h 10m
2026-07-23 ZKZAN - Jul 23, 23:55 UTCJul 24, 00:10 UTC15m
2026-07-23 ZKZAN - Jul 23, 21:15 UTCJul 23, 21:35 UTC20m
2026-07-23 ZKZAN - Jul 23, 08:25 UTCJul 23, 09:35 UTC1h 10m
2026-07-23 ZKZAN - Jul 23, 07:05 UTCJul 23, 07:45 UTC40m
2026-07-22 ZKZAN CHC → CHC Jul 22, 20:45 UTCJul 22, 22:05 UTC1h 20m
2026-07-22 ZKZAN - Jul 22, 00:50 UTCJul 22, 01:05 UTC15m
2026-07-21 ZKZAN - Jul 21, 23:00 UTCJul 21, 23:40 UTC40m
2026-07-21 ZKZAN CHC → CHC Jul 21, 08:15 UTCJul 21, 09:30 UTC1h 15m
2026-07-21 ZKZAN CHC → CHC Jul 21, 07:05 UTCJul 21, 07:35 UTC30m
2026-07-21 ZKZAN CHC → CHC Jul 21, 05:55 UTCJul 21, 06:05 UTC10m
2026-07-21 ZKZAN CHC → CHC Jul 21, 03:50 UTCJul 21, 04:25 UTC35m
2026-07-20 ZKZAN - Jul 20, 22:30 UTCJul 20, 23:25 UTC55m
2026-07-20 ZKZAN CHC → CHC Jul 20, 07:25 UTCJul 20, 08:25 UTC1h 0m
2026-07-20 ZKZAN - Jul 20, 06:25 UTCJul 20, 06:45 UTC20m
2026-07-20 ZKZAN - Jul 20, 01:45 UTCJul 20, 02:40 UTC55m
2026-07-20 ZKZAN CHC → CHC Jul 20, 00:55 UTCJul 20, 01:05 UTC10m
2026-07-18 ZKZAN - Jul 18, 03:25 UTCJul 18, 04:05 UTC40m
2026-07-18 ZKZAN - Jul 18, 01:15 UTCJul 18, 02:25 UTC1h 10m
2026-07-17 ZKZAN - Jul 17, 23:55 UTCJul 18, 00:15 UTC20m
2026-07-17 ZKZAN - Jul 17, 22:10 UTCJul 17, 22:49 UTC40m
2026-07-17 ZKZAN - Jul 17, 20:50 UTCJul 17, 21:34 UTC45m
2026-07-17 ZKZAN - Jul 17, 00:30 UTCJul 17, 00:40 UTC10m
2026-07-16 ZKZAN - Jul 16, 21:35 UTCJul 16, 22:15 UTC40m
2026-07-16 ZKZAN - Jul 16, 07:30 UTCJul 16, 08:15 UTC45m
2026-07-16 ZKZAN - Jul 16, 06:10 UTCJul 16, 06:25 UTC15m
2026-07-15 ZKZAN - Jul 15, 22:40 UTCJul 15, 23:10 UTC30m
2026-07-13 ZKZAN - Jul 13, 22:25 UTCJul 13, 23:25 UTC1h 0m
2026-07-13 ZKZAN - Jul 13, 03:20 UTCJul 13, 04:00 UTC40m
2026-07-10 ZKZAN - Jul 10, 03:20 UTCJul 10, 03:45 UTC25m
2026-07-09 ZKZAN - Jul 9, 21:00 UTCJul 9, 21:30 UTC30m
2026-07-08 ZKZAN CHC → CHC Jul 8, 22:55 UTCJul 8, 23:35 UTC40m
2026-07-01 ZKZAN - Jul 1, 06:25 UTCJul 1, 06:45 UTC20m
2026-07-01 ZKZAN - Jul 1, 01:40 UTCJul 1, 02:20 UTC40m
2026-06-30 ZKZAN - Jun 30, 02:50 UTCJun 30, 03:05 UTC15m
2026-06-30 ZKZAN - Jun 30, 02:05 UTCJun 30, 02:15 UTC10m
2026-05-20 ZKZAN - May 20, 00:30 UTCMay 20, 01:00 UTC30m
2026-05-19 ZKZAN - May 19, 21:10 UTCMay 19, 21:40 UTC30m
2026-05-18 ZKZAN - May 18, 21:35 UTCMay 18, 23:40 UTC2h 5m
2026-05-18 ZKZAN - May 18, 04:20 UTCMay 18, 05:00 UTC40m
2026-05-18 ZKZAN - May 18, 01:40 UTCMay 18, 02:10 UTC30m
2026-05-17 ZKZAN - May 17, 02:50 UTCMay 17, 03:05 UTC15m
2026-05-16 ZKZAN - May 16, 23:55 UTCMay 17, 01:05 UTC1h 10m
2026-05-16 ZKZAN - May 16, 02:20 UTCMay 16, 02:35 UTC15m
2026-05-16 ZKZAN - May 16, 00:40 UTCMay 16, 01:30 UTC50m
2026-05-15 ZKZAN - May 15, 22:40 UTCMay 15, 23:15 UTC35m

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-NAV page for operator, model, and routing details .

Mode-S C81FD1 frequently asked

What is Mode-S code C81FD1?
C81FD1 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-NAV.
Where is Mode-S C81FD1 registered?
Mode-S code C81FD1 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 C81FD1 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81FD1, octal 62017721, decimal 13,115,345.
What flights does C81FD1 operate?
Mode-S C81FD1 has broadcast 1 distinct callsign, including ZKZAN.