Apparatus

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sensors Mode-S transponder

C81CDB

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-TAD · CESSNA 172 Skyhawk

Hex
C81CDB
Octal
62016333
Decimal
13,114,587
Country
NZ
Tail
ZK-TAD
Type
C172
No current signal · last broadcast 1d ago
Flights observed
128
Distinct callsigns
2
Country
NZ
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S C81CDB.

Country allocation

The ICAO 24-bit address C81CDB 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 2 distinct

Callsign Airline Flights Last seen
ZKTAD - 121 2026-06-27
N - 7 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N - Jul 13, 04:05 UTCJul 13, 04:30 UTC25m
2026-07-11 N - Jul 11, 03:10 UTCJul 11, 03:20 UTC10m
2026-07-10 N - Jul 10, 22:30 UTCJul 10, 22:45 UTC15m
2026-07-08 N - Jul 8, 06:20 UTCJul 8, 07:05 UTC45m
2026-07-08 N - Jul 8, 01:55 UTCJul 8, 03:00 UTC1h 5m
2026-07-08 N AMZ → AMZ Jul 8, 00:00 UTCJul 8, 00:50 UTC50m
2026-07-07 N - Jul 7, 21:50 UTCJul 7, 22:50 UTC1h 0m
2026-06-27 ZKTAD AMZ → AMZ Jun 27, 21:40 UTCJun 27, 22:15 UTC35m
2026-06-27 ZKTAD - Jun 27, 03:44 UTCJun 27, 04:29 UTC45m
2026-06-27 ZKTAD - Jun 27, 02:09 UTCJun 27, 02:55 UTC45m
2026-06-26 ZKTAD - Jun 26, 21:35 UTCJun 26, 21:55 UTC20m
2026-06-20 ZKTAD - Jun 20, 01:14 UTCJun 20, 02:49 UTC1h 35m
2026-06-19 ZKTAD - Jun 19, 22:39 UTCJun 20, 00:24 UTC1h 45m
2026-06-19 ZKTAD - Jun 19, 04:14 UTCJun 19, 05:19 UTC1h 5m
2026-06-19 ZKTAD - Jun 19, 01:54 UTCJun 19, 03:24 UTC1h 30m
2026-06-18 ZKTAD - Jun 18, 01:45 UTCJun 18, 02:50 UTC1h 5m
2026-06-17 ZKTAD - Jun 17, 22:10 UTCJun 17, 22:55 UTC45m
2026-06-16 ZKTAD - Jun 16, 20:05 UTCJun 16, 20:50 UTC45m
2026-06-15 ZKTAD - Jun 15, 00:10 UTCJun 15, 00:45 UTC35m
2026-06-13 ZKTAD - Jun 13, 22:35 UTCJun 13, 23:55 UTC1h 20m
2026-06-12 ZKTAD - Jun 12, 21:45 UTCJun 12, 22:20 UTC35m
2026-06-12 ZKTAD - Jun 12, 01:25 UTCJun 12, 02:15 UTC50m
2026-06-11 ZKTAD - Jun 11, 21:50 UTCJun 11, 22:00 UTC10m
2026-06-11 ZKTAD AMZ → AMZ Jun 11, 03:50 UTCJun 11, 04:35 UTC45m
2026-06-11 ZKTAD - Jun 11, 01:50 UTCJun 11, 02:55 UTC1h 5m
2026-06-11 ZKTAD - Jun 11, 00:10 UTCJun 11, 00:35 UTC25m
2026-06-10 ZKTAD - Jun 10, 22:05 UTCJun 10, 23:00 UTC55m
2026-06-10 ZKTAD - Jun 10, 20:35 UTCJun 10, 21:00 UTC25m
2026-06-10 ZKTAD AMZ → AMZ Jun 10, 02:00 UTCJun 10, 02:50 UTC50m
2026-06-09 ZKTAD - Jun 9, 23:45 UTCJun 10, 00:50 UTC1h 5m
2026-06-09 ZKTAD - Jun 9, 21:35 UTCJun 9, 22:20 UTC45m
2026-06-04 ZKTAD AMZ → AMZ Jun 4, 01:25 UTCJun 4, 02:05 UTC40m
2026-06-03 ZKTAD - Jun 3, 21:45 UTCJun 3, 22:20 UTC35m
2026-06-03 ZKTAD AMZ → AMZ Jun 3, 20:20 UTCJun 3, 20:40 UTC20m
2026-05-30 ZKTAD - May 30, 03:10 UTCMay 30, 04:05 UTC55m
2026-05-29 ZKTAD - May 29, 21:55 UTCMay 29, 22:40 UTC45m
2026-05-29 ZKTAD - May 29, 05:45 UTCMay 29, 08:30 UTC2h 45m
2026-05-29 ZKTAD - May 29, 03:40 UTCMay 29, 04:25 UTC45m
2026-05-29 ZKTAD - May 29, 02:35 UTCMay 29, 02:55 UTC20m
2026-05-29 ZKTAD - May 29, 01:50 UTCMay 29, 02:05 UTC15m
2026-05-28 ZKTAD - May 28, 22:35 UTCMay 29, 00:50 UTC2h 15m
2026-05-28 ZKTAD - May 28, 06:05 UTCMay 28, 09:05 UTC3h 0m
2026-05-20 ZKTAD - May 20, 21:30 UTCMay 20, 22:25 UTC55m
2026-05-20 ZKTAD - May 20, 19:50 UTCMay 20, 20:45 UTC55m
2026-05-20 ZKTAD - May 20, 03:30 UTCMay 20, 04:35 UTC1h 5m
2026-05-20 ZKTAD - May 20, 01:30 UTCMay 20, 02:30 UTC1h 0m
2026-05-19 ZKTAD - May 19, 23:30 UTCMay 20, 00:35 UTC1h 5m
2026-05-19 ZKTAD - May 19, 21:25 UTCMay 19, 22:45 UTC1h 20m
2026-05-19 ZKTAD - May 19, 04:40 UTCMay 19, 05:05 UTC25m
2026-05-19 ZKTAD - May 19, 03:25 UTCMay 19, 03:35 UTC10m

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

Mode-S C81CDB frequently asked

What is Mode-S code C81CDB?
C81CDB is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-TAD.
Where is Mode-S C81CDB registered?
Mode-S code C81CDB 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 C81CDB 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 C81CDB, octal 62016333, decimal 13,114,587.
What flights does C81CDB operate?
Mode-S C81CDB has broadcast 2 distinct callsigns, including ZKTAD, N.