Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

C81679

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-UAT · CESSNA 172 Skyhawk

Hex
C81679
Octal
62013171
Decimal
13,112,953
Country
NZ
Tail
ZK-UAT
Type
C172
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
177
Distinct callsigns
1
Country
NZ
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S C81679.

Country allocation

The ICAO 24-bit address C81679 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
ZKUAT - 177 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ZKUAT - Jul 26, 21:40 UTCJul 26, 22:15 UTC35m
2026-07-24 ZKUAT AMZ → AMZ Jul 24, 03:20 UTCJul 24, 04:15 UTC55m
2026-07-23 ZKUAT - Jul 23, 22:40 UTCJul 23, 22:55 UTC15m
2026-07-23 ZKUAT - Jul 23, 20:15 UTCJul 23, 21:00 UTC45m
2026-07-21 ZKUAT - Jul 21, 23:55 UTCJul 22, 00:45 UTC50m
2026-07-21 ZKUAT - Jul 21, 22:25 UTCJul 21, 22:55 UTC30m
2026-07-21 ZKUAT - Jul 21, 20:30 UTCJul 21, 21:05 UTC35m
2026-07-21 ZKUAT - Jul 21, 06:15 UTCJul 21, 06:50 UTC35m
2026-07-21 ZKUAT - Jul 21, 04:10 UTCJul 21, 04:45 UTC35m
2026-07-21 ZKUAT - Jul 21, 01:50 UTCJul 21, 03:10 UTC1h 20m
2026-07-21 ZKUAT - Jul 21, 00:40 UTCJul 21, 01:05 UTC25m
2026-07-20 ZKUAT - Jul 20, 21:15 UTCJul 20, 22:40 UTC1h 25m
2026-07-15 ZKUAT - Jul 15, 06:55 UTCJul 15, 07:20 UTC25m
2026-07-11 ZKUAT - Jul 11, 04:25 UTCJul 11, 04:55 UTC30m
2026-07-11 ZKUAT - Jul 11, 02:10 UTCJul 11, 03:40 UTC1h 30m
2026-07-11 ZKUAT - Jul 11, 01:05 UTCJul 11, 01:15 UTC10m
2026-07-10 ZKUAT - Jul 10, 23:45 UTCJul 11, 00:35 UTC50m
2026-07-10 ZKUAT - Jul 10, 22:50 UTCJul 10, 23:10 UTC20m
2026-07-09 ZKUAT - Jul 9, 03:30 UTCJul 9, 04:25 UTC55m
2026-07-09 ZKUAT - Jul 9, 01:15 UTCJul 9, 02:25 UTC1h 10m
2026-07-08 ZKUAT - Jul 8, 04:00 UTCJul 8, 04:45 UTC45m
2026-07-08 ZKUAT - Jul 8, 02:10 UTCJul 8, 02:20 UTC10m
2026-07-08 ZKUAT - Jul 8, 00:05 UTCJul 8, 00:55 UTC50m
2026-07-05 ZKUAT - Jul 5, 01:30 UTCJul 5, 02:45 UTC1h 15m
2026-07-04 ZKUAT - Jul 4, 23:25 UTCJul 4, 23:55 UTC30m
2026-07-04 ZKUAT - Jul 4, 21:45 UTCJul 4, 22:40 UTC55m
2026-07-03 ZKUAT - Jul 3, 23:45 UTCJul 4, 00:25 UTC40m
2026-07-03 ZKUAT - Jul 3, 22:30 UTCJul 3, 22:55 UTC25m
2026-07-03 ZKUAT - Jul 3, 20:05 UTCJul 3, 20:50 UTC45m
2026-07-03 ZKUAT - Jul 3, 03:45 UTCJul 3, 04:45 UTC1h 0m
2026-07-03 ZKUAT - Jul 3, 01:55 UTCJul 3, 03:05 UTC1h 10m
2026-07-03 ZKUAT - Jul 3, 00:05 UTCJul 3, 00:55 UTC50m
2026-07-02 ZKUAT AMZ → AMZ Jul 2, 06:00 UTCJul 2, 07:30 UTC1h 30m
2026-07-02 ZKUAT - Jul 2, 03:30 UTCJul 2, 04:50 UTC1h 20m
2026-07-02 ZKUAT - Jul 2, 01:40 UTCJul 2, 02:40 UTC1h 0m
2026-07-01 ZKUAT - Jul 1, 23:55 UTCJul 2, 00:30 UTC35m
2026-07-01 ZKUAT AMZ → AMZ Jul 1, 02:00 UTCJul 1, 03:00 UTC1h 0m
2026-06-30 ZKUAT - Jun 30, 20:25 UTCJun 30, 21:05 UTC40m
2026-06-30 ZKUAT - Jun 30, 03:35 UTCJun 30, 04:05 UTC30m
2026-06-30 ZKUAT - Jun 30, 02:50 UTCJun 30, 03:00 UTC10m
2026-06-30 ZKUAT AMZ → AMZ Jun 30, 00:39 UTCJun 30, 01:50 UTC1h 11m
2026-06-29 ZKUAT - Jun 29, 21:30 UTCJun 29, 22:19 UTC50m
2026-06-29 ZKUAT - Jun 29, 20:04 UTCJun 29, 20:40 UTC35m
2026-06-29 ZKUAT - Jun 29, 03:20 UTCJun 29, 04:30 UTC1h 10m
2026-06-29 ZKUAT AMZ → AMZ Jun 29, 02:00 UTCJun 29, 02:39 UTC40m
2026-06-28 ZKUAT - Jun 28, 23:34 UTCJun 29, 00:39 UTC1h 5m
2026-06-28 ZKUAT - Jun 28, 22:55 UTCJun 28, 23:04 UTC10m
2026-06-28 ZKUAT - Jun 28, 04:20 UTCJun 28, 04:29 UTC10m
2026-06-28 ZKUAT - Jun 28, 01:25 UTCJun 28, 02:29 UTC1h 5m
2026-06-27 ZKUAT - Jun 27, 23:45 UTCJun 28, 00:39 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-UAT page for operator, model, and routing details .

Mode-S C81679 frequently asked

What is Mode-S code C81679?
C81679 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-UAT.
Where is Mode-S C81679 registered?
Mode-S code C81679 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 C81679 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81679, octal 62013171, decimal 13,112,953.
What flights does C81679 operate?
Mode-S C81679 has broadcast 1 distinct callsign, including ZKUAT.