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sensors Mode-S transponder

C81CA5

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-KOL · CESSNA 172 Skyhawk

Hex
C81CA5
Octal
62016245
Decimal
13,114,533
Country
NZ
Tail
ZK-KOL
Type
C172
No current signal · last broadcast Jul 24, 00:15 UTC
Flights observed
87
Distinct callsigns
1
Country
NZ
Last broadcast
Jul 24, 00:15 UTC

Last known position

Most recent position reported by Mode-S C81CA5.

Country allocation

The ICAO 24-bit address C81CA5 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
ZKKOL - 87 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 ZKKOL NPE → NPE Jul 23, 23:35 UTCJul 24, 00:15 UTC40m
2026-07-23 ZKKOL NPE → NPE Jul 23, 02:10 UTCJul 23, 04:35 UTC2h 25m
2026-07-22 ZKKOL - Jul 22, 20:50 UTCJul 22, 23:30 UTC2h 40m
2026-07-22 ZKKOL NPE → NPE Jul 22, 01:45 UTCJul 22, 02:35 UTC50m
2026-07-21 ZKKOL - Jul 21, 22:55 UTCJul 22, 00:00 UTC1h 5m
2026-07-21 ZKKOL NPE → NPE Jul 21, 03:45 UTCJul 21, 04:40 UTC55m
2026-07-21 ZKKOL NPE → NPE Jul 21, 00:40 UTCJul 21, 02:30 UTC1h 50m
2026-07-18 ZKKOL - Jul 18, 02:05 UTCJul 18, 03:00 UTC56m
2026-07-17 ZKKOL NPE → NPE Jul 17, 23:45 UTCJul 18, 01:25 UTC1h 40m
2026-07-15 ZKKOL - Jul 15, 22:55 UTCJul 16, 00:40 UTC1h 45m
2026-07-15 ZKKOL - Jul 15, 03:40 UTCJul 15, 05:20 UTC1h 40m
2026-07-15 ZKKOL - Jul 15, 00:05 UTCJul 15, 00:35 UTC30m
2026-07-14 ZKKOL - Jul 14, 22:50 UTCJul 15, 00:00 UTC1h 10m
2026-07-14 ZKKOL - Jul 14, 03:30 UTCJul 14, 04:40 UTC1h 10m
2026-07-13 ZKKOL - Jul 13, 23:15 UTCJul 14, 00:35 UTC1h 20m
2026-07-13 ZKKOL NPE → NPE Jul 13, 19:25 UTCJul 13, 20:25 UTC1h 0m
2026-07-13 ZKKOL NPE → NPE Jul 13, 03:30 UTCJul 13, 04:30 UTC1h 0m
2026-07-12 ZKKOL NPE → NPE Jul 12, 04:25 UTCJul 12, 05:20 UTC55m
2026-07-12 ZKKOL NPE → NPE Jul 12, 02:55 UTCJul 12, 03:50 UTC55m
2026-07-12 ZKKOL NPE → NPE Jul 12, 01:25 UTCJul 12, 02:20 UTC55m
2026-07-11 ZKKOL - Jul 11, 23:30 UTCJul 12, 00:40 UTC1h 10m
2026-07-11 ZKKOL - Jul 11, 21:50 UTCJul 11, 22:20 UTC30m
2026-07-11 ZKKOL - Jul 11, 20:25 UTCJul 11, 21:05 UTC40m
2026-07-11 ZKKOL NPE → NPE Jul 11, 03:30 UTCJul 11, 04:25 UTC55m
2026-07-11 ZKKOL - Jul 11, 01:30 UTCJul 11, 02:10 UTC40m
2026-07-10 ZKKOL NPE → NPE Jul 10, 23:45 UTCJul 11, 00:35 UTC50m
2026-07-10 ZKKOL - Jul 10, 22:25 UTCJul 10, 23:05 UTC40m
2026-07-10 ZKKOL - Jul 10, 19:30 UTCJul 10, 20:40 UTC1h 10m
2026-07-08 ZKKOL - Jul 8, 01:25 UTCJul 8, 02:25 UTC1h 0m
2026-07-04 ZKKOL NPE → NPE Jul 4, 00:50 UTCJul 4, 01:55 UTC1h 5m
2026-07-03 ZKKOL - Jul 3, 23:10 UTCJul 4, 00:15 UTC1h 5m
2026-07-03 ZKKOL - Jul 3, 22:10 UTCJul 3, 22:25 UTC15m
2026-07-03 ZKKOL - Jul 3, 19:15 UTCJul 3, 19:40 UTC25m
2026-07-02 ZKKOL NPE → NPE Jul 2, 23:35 UTCJul 3, 00:55 UTC1h 20m
2026-07-02 ZKKOL - Jul 2, 20:40 UTCJul 2, 21:50 UTC1h 10m
2026-07-02 ZKKOL - Jul 2, 02:30 UTCJul 2, 03:40 UTC1h 10m
2026-07-02 ZKKOL NPE → NPE Jul 2, 00:00 UTCJul 2, 01:20 UTC1h 20m
2026-07-01 ZKKOL - Jul 1, 22:00 UTCJul 1, 23:10 UTC1h 10m
2026-07-01 ZKKOL - Jul 1, 03:20 UTCJul 1, 04:30 UTC1h 10m
2026-07-01 ZKKOL - Jul 1, 01:15 UTCJul 1, 02:25 UTC1h 10m
2026-06-30 ZKKOL - Jun 30, 22:50 UTCJul 1, 00:00 UTC1h 10m
2026-06-30 ZKKOL - Jun 30, 21:05 UTCJun 30, 22:05 UTC1h 0m
2026-06-29 ZKKOL NPE → NPE Jun 29, 04:00 UTCJun 29, 04:50 UTC50m
2026-06-29 ZKKOL NPE → NPE Jun 29, 02:25 UTCJun 29, 03:14 UTC50m
2026-06-28 ZKKOL NPE → NPE Jun 28, 23:09 UTCJun 29, 00:20 UTC1h 10m
2026-06-28 ZKKOL - Jun 28, 21:30 UTCJun 28, 22:34 UTC1h 5m
2026-06-24 ZKKOL NPE → NPE Jun 24, 23:45 UTCJun 25, 00:09 UTC25m
2026-06-24 ZKKOL - Jun 24, 22:39 UTCJun 24, 23:14 UTC35m
2026-06-24 ZKKOL - Jun 24, 21:14 UTCJun 24, 21:54 UTC40m
2026-06-23 ZKKOL NPE → NPE Jun 23, 22:25 UTCJun 23, 23:59 UTC1h 35m

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

Mode-S C81CA5 frequently asked

What is Mode-S code C81CA5?
C81CA5 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-KOL.
Where is Mode-S C81CA5 registered?
Mode-S code C81CA5 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 C81CA5 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 00:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81CA5, octal 62016245, decimal 13,114,533.
What flights does C81CA5 operate?
Mode-S C81CA5 has broadcast 1 distinct callsign, including ZKKOL.