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sensors Mode-S transponder

C8173A

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-TZZ · PARTENAVIA P-68 Observer

Hex
C8173A
Octal
62013472
Decimal
13,113,146
Country
NZ
Tail
ZK-TZZ
Type
P68
No current signal · last broadcast 1d ago
Flights observed
132
Distinct callsigns
1
Country
NZ
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S C8173A.

Country allocation

The ICAO 24-bit address C8173A 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
ZKTZZ - 132 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 ZKTZZ - Jul 12, 22:20 UTCJul 12, 23:05 UTC45m
2026-07-12 ZKTZZ - Jul 12, 21:05 UTCJul 12, 21:40 UTC35m
2026-07-03 ZKTZZ - Jul 3, 03:20 UTCJul 3, 04:05 UTC45m
2026-07-03 ZKTZZ - Jul 3, 01:55 UTCJul 3, 02:25 UTC30m
2026-07-02 ZKTZZ - Jul 2, 23:55 UTCJul 3, 00:35 UTC40m
2026-07-02 ZKTZZ - Jul 2, 22:25 UTCJul 2, 22:55 UTC30m
2026-07-02 ZKTZZ CHC → CHC Jul 2, 02:20 UTCJul 2, 02:45 UTC25m
2026-07-01 ZKTZZ - Jul 1, 23:55 UTCJul 2, 00:35 UTC40m
2026-07-01 ZKTZZ - Jul 1, 22:30 UTCJul 1, 23:05 UTC35m
2026-07-01 ZKTZZ - Jul 1, 04:05 UTCJul 1, 04:20 UTC15m
2026-07-01 ZKTZZ - Jul 1, 01:50 UTCJul 1, 02:15 UTC25m
2026-06-30 ZKTZZ - Jun 30, 22:35 UTCJun 30, 23:00 UTC25m
2026-06-30 ZKTZZ - Jun 30, 01:35 UTCJun 30, 02:40 UTC1h 5m
2026-06-29 ZKTZZ - Jun 29, 03:10 UTCJun 29, 03:44 UTC35m
2026-06-29 ZKTZZ - Jun 29, 01:55 UTCJun 29, 02:09 UTC15m
2026-06-25 ZKTZZ - Jun 25, 22:45 UTCJun 25, 23:49 UTC1h 5m
2026-06-25 ZKTZZ - Jun 25, 20:45 UTCJun 25, 21:29 UTC45m
2026-06-23 ZKTZZ - Jun 23, 23:05 UTCJun 24, 00:05 UTC1h 0m
2026-06-23 ZKTZZ - Jun 23, 21:05 UTCJun 23, 21:59 UTC55m
2026-06-21 ZKTZZ - Jun 21, 22:54 UTCJun 21, 23:40 UTC45m
2026-06-21 ZKTZZ - Jun 21, 21:34 UTCJun 21, 22:00 UTC25m
2026-06-19 ZKTZZ - Jun 19, 03:39 UTCJun 19, 04:14 UTC35m
2026-06-18 ZKTZZ - Jun 18, 22:45 UTCJun 18, 23:30 UTC45m
2026-06-18 ZKTZZ - Jun 18, 21:35 UTCJun 18, 22:05 UTC30m
2026-06-18 ZKTZZ - Jun 18, 04:00 UTCJun 18, 04:45 UTC45m
2026-06-18 ZKTZZ - Jun 18, 02:25 UTCJun 18, 02:45 UTC20m
2026-06-17 ZKTZZ - Jun 17, 22:40 UTCJun 17, 23:40 UTC1h 0m
2026-06-17 ZKTZZ - Jun 17, 20:50 UTCJun 17, 21:35 UTC45m
2026-06-17 ZKTZZ - Jun 17, 03:20 UTCJun 17, 04:25 UTC1h 5m
2026-06-17 ZKTZZ - Jun 17, 02:05 UTCJun 17, 02:25 UTC20m
2026-06-16 ZKTZZ - Jun 16, 22:55 UTCJun 16, 23:45 UTC50m
2026-06-16 ZKTZZ - Jun 16, 03:30 UTCJun 16, 03:50 UTC20m
2026-06-16 ZKTZZ - Jun 16, 01:55 UTCJun 16, 02:29 UTC35m
2026-06-15 ZKTZZ - Jun 15, 23:09 UTCJun 15, 23:25 UTC15m
2026-06-15 ZKTZZ - Jun 15, 21:45 UTCJun 15, 22:10 UTC25m
2026-06-12 ZKTZZ - Jun 12, 21:05 UTCJun 12, 23:15 UTC2h 10m
2026-06-12 ZKTZZ - Jun 12, 04:10 UTCJun 12, 04:25 UTC15m
2026-06-11 ZKTZZ - Jun 11, 23:45 UTCJun 12, 01:55 UTC2h 11m
2026-06-11 ZKTZZ - Jun 11, 20:30 UTCJun 11, 22:30 UTC2h 0m
2026-06-11 ZKTZZ - Jun 11, 03:35 UTCJun 11, 04:35 UTC1h 0m
2026-06-11 ZKTZZ - Jun 11, 01:20 UTCJun 11, 01:50 UTC30m
2026-06-10 ZKTZZ - Jun 10, 21:35 UTCJun 10, 23:40 UTC2h 5m
2026-06-03 ZKTZZ - Jun 3, 04:00 UTCJun 3, 04:40 UTC40m
2026-06-03 ZKTZZ - Jun 3, 02:30 UTCJun 3, 03:05 UTC35m
2026-06-02 ZKTZZ - Jun 2, 23:10 UTCJun 2, 23:25 UTC15m
2026-06-02 ZKTZZ - Jun 2, 22:00 UTCJun 2, 22:25 UTC25m
2026-06-01 ZKTZZ - Jun 1, 22:15 UTCJun 1, 22:30 UTC15m
2026-06-01 ZKTZZ - Jun 1, 21:00 UTCJun 1, 21:35 UTC35m
2026-05-29 ZKTZZ - May 29, 03:15 UTCMay 29, 03:45 UTC30m
2026-05-29 ZKTZZ - May 29, 02:00 UTCMay 29, 02:30 UTC30m

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

Mode-S C8173A frequently asked

What is Mode-S code C8173A?
C8173A is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-TZZ.
Where is Mode-S C8173A registered?
Mode-S code C8173A 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 C8173A broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C8173A, octal 62013472, decimal 13,113,146.
What flights does C8173A operate?
Mode-S C8173A has broadcast 1 distinct callsign, including ZKTZZ.