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sensors Mode-S transponder

C81C64

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-HNO · AGUSTA AW-139

Hex
C81C64
Octal
62016144
Decimal
13,114,468
Country
NZ
Tail
ZK-HNO
Type
A139
No current signal · last broadcast 1d ago
Flights observed
35
Distinct callsigns
1
Country
NZ
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S C81C64.

Country allocation

The ICAO 24-bit address C81C64 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
ZKHNO - 35 2026-04-27

Recent flights last 35

DateFlightRouteTakeoffLandingDuration
2026-04-27 ZKHNO - Apr 27, 07:30 UTCApr 27, 07:45 UTC15m
2026-04-27 ZKHNO - Apr 27, 05:40 UTCApr 27, 06:00 UTC20m
2026-04-26 ZKHNO - Apr 26, 22:10 UTCApr 26, 22:25 UTC15m
2026-04-26 ZKHNO - Apr 26, 20:50 UTCApr 26, 21:05 UTC15m
2026-04-26 ZKHNO - Apr 26, 20:10 UTCApr 26, 20:25 UTC15m
2026-04-26 ZKHNO - Apr 26, 19:00 UTCApr 26, 19:20 UTC20m
2026-04-24 ZKHNO - Apr 24, 03:45 UTCApr 24, 04:00 UTC15m
2026-04-24 ZKHNO - Apr 24, 02:30 UTCApr 24, 02:45 UTC15m
2026-04-23 ZKHNO - Apr 23, 22:00 UTCApr 23, 22:10 UTC10m
2026-04-23 ZKHNO - Apr 23, 20:35 UTCApr 23, 20:55 UTC20m
2026-04-23 ZKHNO - Apr 23, 19:55 UTCApr 23, 20:10 UTC15m
2026-04-23 ZKHNO - Apr 23, 19:05 UTCApr 23, 19:20 UTC15m
2026-04-22 ZKHNO - Apr 22, 22:00 UTCApr 22, 22:15 UTC15m
2026-04-22 ZKHNO - Apr 22, 20:50 UTCApr 22, 21:05 UTC15m
2026-04-22 ZKHNO - Apr 22, 20:20 UTCApr 22, 20:30 UTC10m
2026-04-22 ZKHNO - Apr 22, 19:10 UTCApr 22, 19:25 UTC15m
2026-04-19 ZKHNO - Apr 19, 20:05 UTCApr 19, 20:15 UTC10m
2026-04-19 ZKHNO - Apr 19, 19:10 UTCApr 19, 19:20 UTC10m
2026-04-19 ZKHNO - Apr 19, 02:10 UTCApr 19, 02:25 UTC15m
2026-04-19 ZKHNO - Apr 19, 00:50 UTCApr 19, 01:00 UTC10m
2026-04-19 ZKHNO - Apr 19, 00:00 UTCApr 19, 00:15 UTC15m
2026-04-18 ZKHNO - Apr 18, 23:15 UTCApr 18, 23:25 UTC10m
2026-04-18 ZKHNO - Apr 18, 20:50 UTCApr 18, 21:05 UTC15m
2026-04-18 ZKHNO - Apr 18, 20:20 UTCApr 18, 20:35 UTC15m
2026-04-18 ZKHNO - Apr 18, 19:10 UTCApr 18, 19:25 UTC15m
2026-04-16 ZKHNO - Apr 16, 04:04 UTCApr 16, 04:14 UTC10m
2026-04-16 ZKHNO - Apr 16, 03:09 UTCApr 16, 03:19 UTC10m
2026-04-16 ZKHNO - Apr 16, 01:10 UTCApr 16, 01:25 UTC15m
2026-04-15 ZKHNO - Apr 15, 23:45 UTCApr 16, 00:05 UTC20m
2026-04-15 ZKHNO - Apr 15, 22:20 UTCApr 15, 22:30 UTC10m
2026-04-15 ZKHNO - Apr 15, 20:50 UTCApr 15, 21:00 UTC10m
2026-04-15 ZKHNO - Apr 15, 20:10 UTCApr 15, 20:30 UTC20m
2026-04-15 ZKHNO - Apr 15, 19:10 UTCApr 15, 19:25 UTC15m
2026-04-14 ZKHNO - Apr 14, 22:10 UTCApr 14, 22:25 UTC15m
2026-04-12 ZKHNO - Apr 12, 19:10 UTCApr 12, 19:25 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-HNO page for operator, model, and routing details .

Mode-S C81C64 frequently asked

What is Mode-S code C81C64?
C81C64 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-HNO.
Where is Mode-S C81C64 registered?
Mode-S code C81C64 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 C81C64 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 C81C64, octal 62016144, decimal 13,114,468.
What flights does C81C64 operate?
Mode-S C81C64 has broadcast 1 distinct callsign, including ZKHNO.