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sensors Mode-S transponder

C81C2D

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-TOC · CESSNA 152

Hex
C81C2D
Octal
62016055
Decimal
13,114,413
Country
NZ
Tail
ZK-TOC
Type
C152
No current signal · last broadcast Jul 26, 21:10 UTC
Flights observed
214
Distinct callsigns
1
Country
NZ
Last broadcast
Jul 26, 21:10 UTC

Last known position

Most recent position reported by Mode-S C81C2D.

Country allocation

The ICAO 24-bit address C81C2D 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
ZKTOC - 214 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ZKTOC - Jul 26, 20:55 UTCJul 26, 21:10 UTC15m
2026-07-26 ZKTOC - Jul 26, 02:55 UTCJul 26, 03:55 UTC1h 0m
2026-07-26 ZKTOC - Jul 26, 00:40 UTCJul 26, 01:50 UTC1h 10m
2026-07-25 ZKTOC - Jul 25, 22:40 UTCJul 26, 00:00 UTC1h 20m
2026-07-25 ZKTOC - Jul 25, 00:10 UTCJul 25, 01:15 UTC1h 5m
2026-07-24 ZKTOC - Jul 24, 03:35 UTCJul 24, 04:30 UTC55m
2026-07-24 ZKTOC - Jul 24, 01:25 UTCJul 24, 02:50 UTC1h 25m
2026-07-24 ZKTOC - Jul 24, 00:15 UTCJul 24, 00:30 UTC15m
2026-07-23 ZKTOC - Jul 23, 20:55 UTCJul 23, 21:10 UTC15m
2026-07-23 ZKTOC DUD → DUD Jul 23, 02:50 UTCJul 23, 03:45 UTC55m
2026-07-22 ZKTOC - Jul 22, 04:20 UTCJul 22, 04:45 UTC25m
2026-07-22 ZKTOC - Jul 22, 01:10 UTCJul 22, 01:25 UTC15m
2026-07-21 ZKTOC - Jul 21, 23:20 UTCJul 22, 00:30 UTC1h 10m
2026-07-21 ZKTOC - Jul 21, 21:15 UTCJul 21, 22:35 UTC1h 20m
2026-07-21 ZKTOC - Jul 21, 03:05 UTCJul 21, 04:10 UTC1h 5m
2026-07-21 ZKTOC - Jul 21, 01:35 UTCJul 21, 02:15 UTC40m
2026-07-20 ZKTOC - Jul 20, 21:05 UTCJul 20, 22:20 UTC1h 15m
2026-07-20 ZKTOC - Jul 20, 03:40 UTCJul 20, 04:40 UTC1h 0m
2026-07-20 ZKTOC - Jul 20, 01:30 UTCJul 20, 02:50 UTC1h 20m
2026-07-19 ZKTOC - Jul 19, 23:50 UTCJul 20, 00:05 UTC15m
2026-07-19 ZKTOC - Jul 19, 20:55 UTCJul 19, 21:10 UTC15m
2026-07-18 ZKTOC - Jul 18, 23:55 UTCJul 19, 00:25 UTC30m
2026-07-18 ZKTOC - Jul 18, 22:35 UTCJul 18, 23:05 UTC30m
2026-07-18 ZKTOC - Jul 18, 20:50 UTCJul 18, 22:05 UTC1h 15m
2026-07-17 ZKTOC - Jul 17, 04:39 UTCJul 17, 04:54 UTC15m
2026-07-16 ZKTOC - Jul 16, 21:45 UTCJul 16, 22:10 UTC25m
2026-07-16 ZKTOC - Jul 16, 00:15 UTCJul 16, 00:30 UTC15m
2026-07-13 ZKTOC - Jul 13, 22:45 UTCJul 13, 23:40 UTC55m
2026-07-13 ZKTOC - Jul 13, 21:10 UTCJul 13, 22:00 UTC50m
2026-07-13 ZKTOC - Jul 13, 03:01 UTCJul 13, 03:25 UTC25m
2026-07-12 ZKTOC - Jul 12, 01:30 UTCJul 12, 02:05 UTC35m
2026-07-11 ZKTOC - Jul 11, 23:55 UTCJul 12, 00:50 UTC55m
2026-07-11 ZKTOC - Jul 11, 21:20 UTCJul 11, 21:40 UTC20m
2026-07-10 ZKTOC - Jul 10, 23:50 UTCJul 11, 01:20 UTC1h 30m
2026-07-10 ZKTOC - Jul 10, 21:15 UTCJul 10, 21:40 UTC25m
2026-07-10 ZKTOC - Jul 10, 03:15 UTCJul 10, 03:35 UTC20m
2026-07-10 ZKTOC - Jul 10, 00:35 UTCJul 10, 00:50 UTC15m
2026-07-09 ZKTOC - Jul 9, 01:05 UTCJul 9, 02:45 UTC1h 40m
2026-07-08 ZKTOC - Jul 8, 23:10 UTCJul 9, 00:15 UTC1h 5m
2026-07-08 ZKTOC - Jul 8, 20:45 UTCJul 8, 21:30 UTC45m
2026-07-07 ZKTOC - Jul 7, 00:50 UTCJul 7, 01:50 UTC1h 0m
2026-07-02 ZKTOC - Jul 2, 22:50 UTCJul 2, 23:25 UTC35m
2026-07-02 ZKTOC - Jul 2, 04:15 UTCJul 2, 04:50 UTC35m
2026-07-02 ZKTOC - Jul 2, 02:25 UTCJul 2, 03:10 UTC45m
2026-07-02 ZKTOC - Jul 2, 00:45 UTCJul 2, 01:40 UTC55m
2026-07-01 ZKTOC - Jul 1, 22:45 UTCJul 2, 00:00 UTC1h 15m
2026-07-01 ZKTOC - Jul 1, 04:00 UTCJul 1, 04:55 UTC55m
2026-07-01 ZKTOC - Jul 1, 02:25 UTCJul 1, 02:50 UTC25m
2026-06-30 ZKTOC - Jun 30, 22:35 UTCJun 30, 23:05 UTC30m
2026-06-30 ZKTOC - Jun 30, 04:00 UTCJun 30, 05:00 UTC1h 0m

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

Mode-S C81C2D frequently asked

What is Mode-S code C81C2D?
C81C2D is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-TOC.
Where is Mode-S C81C2D registered?
Mode-S code C81C2D 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 C81C2D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81C2D, octal 62016055, decimal 13,114,413.
What flights does C81C2D operate?
Mode-S C81C2D has broadcast 1 distinct callsign, including ZKTOC.