Apparatus

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sensors Mode-S transponder

C81530

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-OAT · CESSNA 172 Skyhawk

Hex
C81530
Octal
62012460
Decimal
13,112,624
Country
NZ
Tail
ZK-OAT
Type
C172
No current signal · last broadcast Jul 24, 00:40 UTC
Flights observed
203
Distinct callsigns
1
Country
NZ
Last broadcast
Jul 24, 00:40 UTC

Last known position

Most recent position reported by Mode-S C81530.

Country allocation

The ICAO 24-bit address C81530 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
ZKOAT - 203 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 ZKOAT - Jul 23, 23:35 UTCJul 24, 00:40 UTC1h 5m
2026-07-23 ZKOAT - Jul 23, 21:15 UTCJul 23, 22:45 UTC1h 30m
2026-07-23 ZKOAT AMZ → AMZ Jul 23, 03:20 UTCJul 23, 03:55 UTC35m
2026-07-22 ZKOAT - Jul 22, 01:55 UTCJul 22, 02:15 UTC20m
2026-07-21 ZKOAT AMZ → AMZ Jul 21, 23:20 UTCJul 22, 00:40 UTC1h 20m
2026-07-21 ZKOAT - Jul 21, 20:25 UTCJul 21, 20:55 UTC30m
2026-07-21 ZKOAT - Jul 21, 06:15 UTCJul 21, 07:15 UTC1h 0m
2026-07-21 ZKOAT - Jul 21, 04:00 UTCJul 21, 05:00 UTC1h 0m
2026-07-21 ZKOAT - Jul 21, 02:00 UTCJul 21, 03:00 UTC1h 0m
2026-07-21 ZKOAT - Jul 21, 00:15 UTCJul 21, 00:45 UTC30m
2026-07-20 ZKOAT - Jul 20, 21:35 UTCJul 20, 22:50 UTC1h 15m
2026-07-20 ZKOAT - Jul 20, 20:10 UTCJul 20, 20:45 UTC35m
2026-07-11 ZKOAT - Jul 11, 01:40 UTCJul 11, 03:35 UTC1h 55m
2026-07-08 ZKOAT - Jul 8, 01:30 UTCJul 8, 02:20 UTC50m
2026-07-07 ZKOAT - Jul 7, 21:40 UTCJul 7, 22:40 UTC1h 0m
2026-07-03 ZKOAT - Jul 3, 03:30 UTCJul 3, 04:05 UTC35m
2026-07-02 ZKOAT - Jul 2, 23:40 UTCJul 3, 01:15 UTC1h 35m
2026-07-02 ZKOAT - Jul 2, 21:40 UTCJul 2, 22:20 UTC40m
2026-07-02 ZKOAT AMZ → AMZ Jul 2, 03:45 UTCJul 2, 04:35 UTC50m
2026-07-02 ZKOAT - Jul 2, 01:20 UTCJul 2, 02:50 UTC1h 30m
2026-07-01 ZKOAT AMZ → AMZ Jul 1, 23:50 UTCJul 2, 00:35 UTC45m
2026-07-01 ZKOAT - Jul 1, 21:30 UTCJul 1, 22:50 UTC1h 20m
2026-07-01 ZKOAT - Jul 1, 04:00 UTCJul 1, 04:30 UTC30m
2026-07-01 ZKOAT - Jul 1, 01:25 UTCJul 1, 02:45 UTC1h 20m
2026-06-30 ZKOAT - Jun 30, 23:55 UTCJul 1, 00:50 UTC55m
2026-06-30 ZKOAT - Jun 30, 22:05 UTCJun 30, 22:55 UTC50m
2026-06-30 ZKOAT - Jun 30, 03:35 UTCJun 30, 04:55 UTC1h 20m
2026-06-30 ZKOAT - Jun 30, 02:35 UTCJun 30, 02:50 UTC15m
2026-06-30 ZKOAT - Jun 30, 01:30 UTCJun 30, 01:50 UTC20m
2026-06-29 ZKOAT - Jun 29, 23:49 UTCJun 30, 00:49 UTC1h 0m
2026-06-29 ZKOAT - Jun 29, 21:30 UTCJun 29, 22:30 UTC1h 0m
2026-06-29 ZKOAT AMZ → AMZ Jun 29, 02:39 UTCJun 29, 04:00 UTC1h 20m
2026-06-28 ZKOAT - Jun 28, 23:04 UTCJun 29, 00:20 UTC1h 15m
2026-06-28 ZKOAT - Jun 28, 20:04 UTCJun 28, 20:54 UTC50m
2026-06-28 ZKOAT - Jun 28, 01:50 UTCJun 28, 04:50 UTC3h 0m
2026-06-27 ZKOAT - Jun 27, 23:14 UTCJun 28, 00:35 UTC1h 20m
2026-06-27 ZKOAT AMZ → AMZ Jun 27, 21:15 UTCJun 27, 22:29 UTC1h 15m
2026-06-27 ZKOAT - Jun 27, 03:40 UTCJun 27, 04:44 UTC1h 5m
2026-06-27 ZKOAT - Jun 27, 01:35 UTCJun 27, 02:50 UTC1h 15m
2026-06-26 ZKOAT - Jun 26, 23:39 UTCJun 27, 00:20 UTC40m
2026-06-26 ZKOAT - Jun 26, 21:59 UTCJun 26, 22:40 UTC40m
2026-06-25 ZKOAT - Jun 25, 02:35 UTCJun 25, 02:54 UTC20m
2026-06-23 ZKOAT AMZ → AMZ Jun 23, 02:29 UTCJun 23, 03:09 UTC40m
2026-06-22 ZKOAT - Jun 22, 03:50 UTCJun 22, 04:54 UTC1h 5m
2026-06-22 ZKOAT - Jun 22, 01:35 UTCJun 22, 02:34 UTC1h 0m
2026-06-21 ZKOAT - Jun 21, 23:30 UTCJun 22, 00:50 UTC1h 20m
2026-06-21 ZKOAT AMZ → AMZ Jun 21, 21:29 UTCJun 21, 22:10 UTC40m
2026-06-20 ZKOAT - Jun 20, 03:39 UTCJun 20, 03:59 UTC20m
2026-06-20 ZKOAT - Jun 20, 00:59 UTCJun 20, 01:24 UTC25m
2026-06-19 ZKOAT AMZ → AMZ Jun 19, 06:20 UTCJun 19, 06:35 UTC15m

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

Mode-S C81530 frequently asked

What is Mode-S code C81530?
C81530 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-OAT.
Where is Mode-S C81530 registered?
Mode-S code C81530 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 C81530 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 00:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81530, octal 62012460, decimal 13,112,624.
What flights does C81530 operate?
Mode-S C81530 has broadcast 1 distinct callsign, including ZKOAT.