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sensors Mode-S transponder

C81A6D

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-EHA · CESSNA 172 Skyhawk

Hex
C81A6D
Octal
62015155
Decimal
13,113,965
Country
NZ
Tail
ZK-EHA
Type
C172
No current signal · last broadcast Jul 22, 02:20 UTC
Flights observed
45
Distinct callsigns
1
Country
NZ
Last broadcast
Jul 22, 02:20 UTC

Last known position

Most recent position reported by Mode-S C81A6D.

Country allocation

The ICAO 24-bit address C81A6D 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
ZKEHA - 45 2026-07-22

Recent flights last 45

DateFlightRouteTakeoffLandingDuration
2026-07-22 ZKEHA - Jul 22, 01:35 UTCJul 22, 02:20 UTC45m
2026-07-21 ZKEHA - Jul 21, 00:40 UTCJul 21, 01:15 UTC35m
2026-07-20 ZKEHA - Jul 20, 22:50 UTCJul 20, 23:25 UTC35m
2026-07-19 ZKEHA - Jul 19, 03:05 UTCJul 19, 03:20 UTC15m
2026-07-16 ZKEHA - Jul 16, 02:15 UTCJul 16, 03:05 UTC50m
2026-07-15 ZKEHA - Jul 15, 02:25 UTCJul 15, 03:45 UTC1h 20m
2026-07-12 ZKEHA - Jul 12, 02:20 UTCJul 12, 02:50 UTC30m
2026-07-12 ZKEHA - Jul 12, 01:15 UTCJul 12, 01:40 UTC25m
2026-07-10 ZKEHA - Jul 10, 02:45 UTCJul 10, 03:35 UTC50m
2026-07-09 ZKEHA - Jul 9, 23:30 UTCJul 10, 00:45 UTC1h 15m
2026-07-08 ZKEHA - Jul 8, 03:40 UTCJul 8, 04:25 UTC45m
2026-07-07 ZKEHA - Jul 7, 23:25 UTCJul 8, 00:15 UTC50m
2026-07-03 ZKEHA - Jul 3, 00:45 UTCJul 3, 01:40 UTC55m
2026-07-02 ZKEHA - Jul 2, 03:25 UTCJul 2, 04:15 UTC50m
2026-07-01 ZKEHA - Jul 1, 04:50 UTCJul 1, 05:00 UTC10m
2026-07-01 ZKEHA - Jul 1, 03:25 UTCJul 1, 03:45 UTC20m
2026-06-20 ZKEHA - Jun 20, 01:09 UTCJun 20, 01:19 UTC10m
2026-06-18 ZKEHA - Jun 18, 23:05 UTCJun 18, 23:45 UTC40m
2026-06-18 ZKEHA - Jun 18, 03:50 UTCJun 18, 04:25 UTC35m
2026-06-12 ZKEHA - Jun 12, 03:10 UTCJun 12, 04:00 UTC50m
2026-06-11 ZKEHA - Jun 11, 03:05 UTCJun 11, 03:35 UTC30m
2026-06-07 ZKEHA - Jun 7, 03:10 UTCJun 7, 03:45 UTC35m
2026-06-07 ZKEHA - Jun 7, 00:25 UTCJun 7, 01:00 UTC35m
2026-05-30 ZKEHA - May 30, 21:30 UTCMay 30, 23:35 UTC2h 5m
2026-05-30 ZKEHA - May 30, 01:35 UTCMay 30, 02:50 UTC1h 15m
2026-05-29 ZKEHA - May 29, 00:25 UTCMay 29, 02:05 UTC1h 40m
2026-05-28 ZKEHA - May 28, 03:55 UTCMay 28, 04:20 UTC25m
2026-05-28 ZKEHA - May 28, 03:05 UTCMay 28, 03:25 UTC20m
2026-05-27 ZKEHA - May 27, 04:09 UTCMay 27, 05:04 UTC55m
2026-05-21 ZKEHA - May 21, 04:45 UTCMay 21, 05:20 UTC35m
2026-05-20 ZKEHA - May 20, 04:30 UTCMay 20, 05:10 UTC41m
2026-05-19 ZKEHA - May 19, 22:00 UTCMay 19, 22:50 UTC50m
2026-05-18 ZKEHA - May 18, 23:00 UTCMay 18, 23:25 UTC25m
2026-05-16 ZKEHA - May 16, 02:30 UTCMay 16, 03:30 UTC1h 0m
2026-05-15 ZKEHA - May 15, 02:55 UTCMay 15, 03:55 UTC1h 0m
2026-05-14 ZKEHA - May 14, 03:30 UTCMay 14, 03:50 UTC20m
2026-05-14 ZKEHA - May 14, 01:30 UTCMay 14, 02:55 UTC1h 25m
2026-05-11 ZKEHA - May 11, 04:55 UTCMay 11, 05:10 UTC15m
2026-05-11 ZKEHA - May 11, 02:55 UTCMay 11, 03:20 UTC25m
2026-05-11 ZKEHA - May 11, 00:00 UTCMay 11, 00:34 UTC35m
2026-04-26 ZKEHA - Apr 26, 02:50 UTCApr 26, 03:05 UTC15m
2026-04-17 ZKEHA - Apr 17, 05:20 UTCApr 17, 05:40 UTC20m
2026-04-16 ZKEHA - Apr 16, 05:09 UTCApr 16, 05:29 UTC20m
2026-04-16 ZKEHA - Apr 16, 04:44 UTCApr 16, 05:05 UTC20m
2026-04-16 ZKEHA - Apr 16, 00:25 UTCApr 16, 00:55 UTC30m

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

Mode-S C81A6D frequently asked

What is Mode-S code C81A6D?
C81A6D is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-EHA.
Where is Mode-S C81A6D registered?
Mode-S code C81A6D 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 C81A6D broadcasting right now?
No active broadcast right now. Last signal was Jul 22, 02:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81A6D, octal 62015155, decimal 13,113,965.
What flights does C81A6D operate?
Mode-S C81A6D has broadcast 1 distinct callsign, including ZKEHA.