Apparatus

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sensors Mode-S transponder

C81D1B

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-TUT · CESSNA 152

Hex
C81D1B
Octal
62016433
Decimal
13,114,651
Country
NZ
Tail
ZK-TUT
Type
C152
No current signal · last broadcast Jul 23, 23:40 UTC
Flights observed
222
Distinct callsigns
1
Country
NZ
Last broadcast
Jul 23, 23:40 UTC

Last known position

Most recent position reported by Mode-S C81D1B.

Country allocation

The ICAO 24-bit address C81D1B 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
ZKTUT - 222 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 ZKTUT NPE → NPE Jul 23, 23:00 UTCJul 23, 23:40 UTC40m
2026-07-23 ZKTUT - Jul 23, 20:45 UTCJul 23, 21:10 UTC25m
2026-07-23 ZKTUT - Jul 23, 03:40 UTCJul 23, 04:30 UTC50m
2026-07-23 ZKTUT NPE → NPE Jul 23, 02:30 UTCJul 23, 02:50 UTC20m
2026-07-22 ZKTUT - Jul 22, 23:35 UTCJul 23, 00:10 UTC35m
2026-07-22 ZKTUT - Jul 22, 21:30 UTCJul 22, 22:10 UTC40m
2026-07-22 ZKTUT PMR → NPE Jul 22, 02:50 UTCJul 22, 04:25 UTC1h 35m
2026-07-22 ZKTUT - Jul 22, 01:55 UTCJul 22, 02:15 UTC20m
2026-07-21 ZKTUT - Jul 21, 23:20 UTCJul 22, 00:10 UTC50m
2026-07-21 ZKTUT - Jul 21, 21:15 UTCJul 21, 22:10 UTC55m
2026-07-21 ZKTUT NPE → NPE Jul 21, 03:00 UTCJul 21, 04:50 UTC1h 50m
2026-07-20 ZKTUT NPE → NPE Jul 20, 23:05 UTCJul 20, 23:55 UTC49m
2026-07-20 ZKTUT NPE → NPE Jul 20, 21:25 UTCJul 20, 22:10 UTC45m
2026-07-20 ZKTUT - Jul 20, 07:05 UTCJul 20, 07:55 UTC50m
2026-07-20 ZKTUT - Jul 20, 04:10 UTCJul 20, 04:30 UTC20m
2026-07-20 ZKTUT - Jul 20, 02:20 UTCJul 20, 03:30 UTC1h 10m
2026-07-20 ZKTUT - Jul 20, 01:20 UTCJul 20, 01:40 UTC20m
2026-07-19 ZKTUT - Jul 19, 23:25 UTCJul 20, 00:35 UTC1h 10m
2026-07-19 ZKTUT NPE → NPE Jul 19, 20:50 UTCJul 19, 21:35 UTC45m
2026-07-17 ZKTUT - Jul 17, 02:15 UTCJul 17, 02:50 UTC35m
2026-07-17 ZKTUT - Jul 17, 01:05 UTCJul 17, 01:39 UTC35m
2026-07-16 ZKTUT - Jul 16, 21:05 UTCJul 16, 22:00 UTC55m
2026-07-16 ZKTUT - Jul 16, 02:15 UTCJul 16, 02:55 UTC40m
2026-07-15 ZKTUT - Jul 15, 23:30 UTCJul 16, 00:00 UTC30m
2026-07-15 ZKTUT NPE → NPE Jul 15, 21:15 UTCJul 15, 21:45 UTC30m
2026-07-15 ZKTUT - Jul 15, 06:10 UTCJul 15, 06:45 UTC35m
2026-07-15 ZKTUT NPE → NPE Jul 15, 04:20 UTCJul 15, 05:05 UTC45m
2026-07-15 ZKTUT - Jul 15, 03:05 UTCJul 15, 03:20 UTC15m
2026-07-15 ZKTUT - Jul 15, 01:40 UTCJul 15, 02:15 UTC35m
2026-07-14 ZKTUT - Jul 14, 23:45 UTCJul 15, 00:20 UTC35m
2026-07-14 ZKTUT - Jul 14, 21:15 UTCJul 14, 21:45 UTC30m
2026-07-14 ZKTUT NPE → NPE Jul 14, 06:00 UTCJul 14, 06:35 UTC35m
2026-07-14 ZKTUT - Jul 14, 03:30 UTCJul 14, 03:50 UTC20m
2026-07-14 ZKTUT - Jul 14, 01:55 UTCJul 14, 02:15 UTC20m
2026-07-13 ZKTUT - Jul 13, 23:35 UTCJul 14, 00:00 UTC25m
2026-07-13 ZKTUT - Jul 13, 21:55 UTCJul 13, 22:20 UTC25m
2026-07-13 ZKTUT NPE → NPE Jul 13, 08:10 UTCJul 13, 08:50 UTC40m
2026-07-13 ZKTUT - Jul 13, 07:15 UTCJul 13, 07:40 UTC25m
2026-07-13 ZKTUT - Jul 13, 03:20 UTCJul 13, 03:40 UTC20m
2026-07-13 ZKTUT - Jul 13, 02:05 UTCJul 13, 02:35 UTC30m
2026-07-12 ZKTUT NPE → NPE Jul 12, 23:30 UTCJul 13, 01:10 UTC1h 40m
2026-07-12 ZKTUT - Jul 12, 22:15 UTCJul 12, 22:30 UTC15m
2026-07-12 ZKTUT - Jul 12, 04:10 UTCJul 12, 04:35 UTC25m
2026-07-12 ZKTUT - Jul 12, 02:01 UTCJul 12, 03:35 UTC1h 35m
2026-07-12 ZKTUT - Jul 12, 01:05 UTCJul 12, 01:25 UTC20m
2026-07-11 ZKTUT NPE → NPE Jul 11, 22:40 UTCJul 12, 00:10 UTC1h 30m
2026-07-11 ZKTUT NPE → NPE Jul 11, 20:50 UTCJul 11, 21:55 UTC1h 5m
2026-07-07 ZKTUT NPE → NPE Jul 7, 01:45 UTCJul 7, 02:10 UTC25m
2026-07-06 ZKTUT NPE → NPE Jul 6, 21:25 UTCJul 6, 21:40 UTC15m
2026-07-05 ZKTUT NPE → NPE Jul 5, 20:50 UTCJul 5, 21:45 UTC55m

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

Mode-S C81D1B frequently asked

What is Mode-S code C81D1B?
C81D1B is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-TUT.
Where is Mode-S C81D1B registered?
Mode-S code C81D1B 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 C81D1B broadcasting right now?
No active broadcast right now. Last signal was Jul 23, 23:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81D1B, octal 62016433, decimal 13,114,651.
What flights does C81D1B operate?
Mode-S C81D1B has broadcast 1 distinct callsign, including ZKTUT.