Apparatus

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sensors Mode-S transponder

C81BC2

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-ROX · SkyStar Kitfox VII

Hex
C81BC2
Octal
62015702
Decimal
13,114,306
Country
NZ
Tail
ZK-ROX
Type
PARA
No current signal · last broadcast Jul 26, 05:15 UTC
Flights observed
43
Distinct callsigns
1
Country
NZ
Last broadcast
Jul 26, 05:15 UTC

Last known position

Most recent position reported by Mode-S C81BC2.

Country allocation

The ICAO 24-bit address C81BC2 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
ZKROX - 43 2026-07-26

Recent flights last 43

DateFlightRouteTakeoffLandingDuration
2026-07-26 ZKROX - Jul 26, 03:25 UTCJul 26, 05:15 UTC1h 50m
2026-07-25 ZKROX - Jul 25, 21:15 UTCJul 25, 21:50 UTC35m
2026-07-19 ZKROX - Jul 19, 05:05 UTCJul 19, 05:20 UTC15m
2026-07-18 ZKROX - Jul 18, 21:05 UTCJul 18, 21:35 UTC30m
2026-07-17 ZKROX - Jul 17, 21:44 UTCJul 17, 22:29 UTC45m
2026-06-28 ZKROX - Jun 28, 04:20 UTCJun 28, 04:29 UTC10m
2026-06-27 ZKROX - Jun 27, 22:49 UTCJun 27, 23:34 UTC45m
2026-06-22 ZKROX - Jun 22, 04:09 UTCJun 22, 04:34 UTC25m
2026-06-21 ZKROX - Jun 21, 21:49 UTCJun 21, 22:10 UTC20m
2026-06-18 ZKROX - Jun 18, 04:15 UTCJun 18, 04:25 UTC10m
2026-06-07 ZKROX - Jun 7, 03:45 UTCJun 7, 04:25 UTC40m
2026-06-07 ZKROX - Jun 7, 02:30 UTCJun 7, 02:50 UTC20m
2026-06-07 ZKROX - Jun 7, 00:39 UTCJun 7, 00:55 UTC15m
2026-06-01 ZKROX - Jun 1, 00:15 UTCJun 1, 00:40 UTC25m
2026-05-28 ZKROX - May 28, 20:05 UTCMay 28, 20:25 UTC20m
2026-05-25 ZKROX - May 25, 03:00 UTCMay 25, 03:15 UTC15m
2026-05-25 ZKROX - May 25, 01:55 UTCMay 25, 02:05 UTC10m
2026-05-23 ZKROX - May 23, 19:55 UTCMay 23, 20:45 UTC50m
2026-05-22 ZKROX - May 22, 21:10 UTCMay 22, 22:05 UTC55m
2026-05-19 ZKROX - May 19, 04:15 UTCMay 19, 04:25 UTC10m
2026-05-19 ZKROX - May 19, 00:50 UTCMay 19, 01:00 UTC10m
2026-05-18 ZKROX - May 18, 03:55 UTCMay 18, 04:20 UTC25m
2026-05-18 ZKROX - May 18, 02:10 UTCMay 18, 02:50 UTC40m
2026-05-17 ZKROX - May 17, 01:30 UTCMay 17, 03:00 UTC1h 30m
2026-05-14 ZKROX - May 14, 23:00 UTCMay 14, 23:40 UTC40m
2026-05-14 ZKROX - May 14, 02:40 UTCMay 14, 03:00 UTC20m
2026-05-13 ZKROX - May 13, 02:35 UTCMay 13, 02:55 UTC20m
2026-05-13 ZKROX - May 13, 00:25 UTCMay 13, 01:20 UTC55m
2026-05-12 ZKROX - May 12, 04:00 UTCMay 12, 04:40 UTC40m
2026-05-11 ZKROX MRO → MRO May 11, 21:55 UTCMay 11, 22:10 UTC15m
2026-05-11 ZKROX - May 11, 02:10 UTCMay 11, 03:05 UTC55m
2026-05-10 ZKROX - May 10, 23:19 UTCMay 10, 23:29 UTC10m
2026-05-09 ZKROX - May 9, 02:55 UTCMay 9, 04:05 UTC1h 10m
2026-04-28 ZKROX - Apr 28, 21:00 UTCApr 28, 21:40 UTC40m
2026-04-26 ZKROX - Apr 26, 23:50 UTCApr 27, 00:50 UTC1h 0m
2026-04-26 ZKROX - Apr 26, 20:30 UTCApr 26, 20:40 UTC10m
2026-04-25 ZKROX - Apr 25, 23:15 UTCApr 26, 00:05 UTC50m
2026-04-25 ZKROX - Apr 25, 04:35 UTCApr 25, 05:00 UTC25m
2026-04-25 ZKROX - Apr 25, 00:40 UTCApr 25, 01:05 UTC25m
2026-04-24 ZKROX - Apr 24, 04:00 UTCApr 24, 04:40 UTC40m
2026-04-23 ZKROX - Apr 23, 19:45 UTCApr 23, 20:15 UTC30m
2026-04-23 ZKROX - Apr 23, 05:00 UTCApr 23, 05:50 UTC50m
2026-04-13 ZKROX - Apr 13, 21:30 UTCApr 13, 21:50 UTC20m

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

Mode-S C81BC2 frequently asked

What is Mode-S code C81BC2?
C81BC2 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-ROX.
Where is Mode-S C81BC2 registered?
Mode-S code C81BC2 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 C81BC2 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 05:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81BC2, octal 62015702, decimal 13,114,306.
What flights does C81BC2 operate?
Mode-S C81BC2 has broadcast 1 distinct callsign, including ZKROX.