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sensors Mode-S transponder

C81A1C

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-TZM · ROBIN Alpha

Hex
C81A1C
Octal
62015034
Decimal
13,113,884
Country
NZ
Tail
ZK-TZM
Type
R200
Broadcasting now · callsign ZKTZM · 900 ft
Flights observed
209
Distinct callsigns
1
Country
NZ
Last broadcast
Jul 24, 01:35 UTC

Current position

C81A1C is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address C81A1C 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
ZKTZM - 209 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 ZKTZM - Jul 24, 01:00 UTCJul 24, 01:35 UTC35m
2026-07-23 ZKTZM - Jul 23, 22:50 UTCJul 23, 23:35 UTC45m
2026-07-23 ZKTZM - Jul 23, 20:35 UTCJul 23, 21:45 UTC1h 10m
2026-07-23 ZKTZM - Jul 23, 19:25 UTCJul 23, 19:55 UTC30m
2026-07-23 ZKTZM - Jul 23, 03:35 UTCJul 23, 04:25 UTC50m
2026-07-23 ZKTZM - Jul 23, 02:35 UTCJul 23, 02:55 UTC20m
2026-07-23 ZKTZM - Jul 23, 00:40 UTCJul 23, 01:05 UTC25m
2026-07-22 ZKTZM - Jul 22, 21:45 UTCJul 22, 22:25 UTC40m
2026-07-22 ZKTZM - Jul 22, 04:20 UTCJul 22, 04:50 UTC30m
2026-07-22 ZKTZM - Jul 22, 02:55 UTCJul 22, 03:45 UTC50m
2026-07-22 ZKTZM - Jul 22, 01:10 UTCJul 22, 01:55 UTC45m
2026-07-21 ZKTZM - Jul 21, 22:40 UTCJul 22, 00:20 UTC1h 40m
2026-07-21 ZKTZM - Jul 21, 21:20 UTCJul 21, 21:55 UTC35m
2026-07-21 ZKTZM - Jul 21, 03:25 UTCJul 21, 04:10 UTC45m
2026-07-21 ZKTZM - Jul 21, 00:55 UTCJul 21, 01:30 UTC35m
2026-07-20 ZKTZM - Jul 20, 22:00 UTCJul 20, 22:30 UTC30m
2026-07-20 ZKTZM - Jul 20, 21:00 UTCJul 20, 21:30 UTC30m
2026-07-20 ZKTZM - Jul 20, 01:50 UTCJul 20, 03:40 UTC1h 50m
2026-07-20 ZKTZM - Jul 20, 00:55 UTCJul 20, 01:10 UTC15m
2026-07-18 ZKTZM - Jul 18, 21:10 UTCJul 18, 21:35 UTC25m
2026-07-18 ZKTZM - Jul 18, 04:20 UTCJul 18, 04:45 UTC25m
2026-07-18 ZKTZM - Jul 18, 02:35 UTCJul 18, 02:50 UTC16m
2026-07-18 ZKTZM - Jul 18, 00:15 UTCJul 18, 00:55 UTC40m
2026-07-17 ZKTZM - Jul 17, 23:14 UTCJul 17, 23:30 UTC15m
2026-07-17 ZKTZM - Jul 17, 04:10 UTCJul 17, 04:25 UTC15m
2026-07-17 ZKTZM - Jul 17, 02:50 UTCJul 17, 03:34 UTC45m
2026-07-17 ZKTZM - Jul 17, 01:59 UTCJul 17, 02:15 UTC15m
2026-07-17 ZKTZM - Jul 17, 01:15 UTCJul 17, 01:25 UTC10m
2026-07-16 ZKTZM - Jul 16, 20:35 UTCJul 16, 21:25 UTC50m
2026-07-16 ZKTZM - Jul 16, 03:15 UTCJul 16, 03:30 UTC15m
2026-07-16 ZKTZM - Jul 16, 00:20 UTCJul 16, 00:40 UTC20m
2026-07-15 ZKTZM - Jul 15, 03:40 UTCJul 15, 04:05 UTC25m
2026-07-15 ZKTZM - Jul 15, 01:40 UTCJul 15, 02:45 UTC1h 5m
2026-07-15 ZKTZM - Jul 15, 00:40 UTCJul 15, 00:50 UTC10m
2026-07-14 ZKTZM - Jul 14, 23:20 UTCJul 14, 23:30 UTC10m
2026-07-14 ZKTZM - Jul 14, 21:15 UTCJul 14, 21:50 UTC35m
2026-07-13 ZKTZM - Jul 13, 23:25 UTCJul 13, 23:55 UTC30m
2026-07-13 ZKTZM - Jul 13, 02:40 UTCJul 13, 04:50 UTC2h 10m
2026-07-13 ZKTZM - Jul 13, 01:50 UTCJul 13, 02:05 UTC15m
2026-07-12 ZKTZM - Jul 12, 23:00 UTCJul 12, 23:30 UTC30m
2026-07-12 ZKTZM - Jul 12, 21:10 UTCJul 12, 21:50 UTC40m
2026-07-12 ZKTZM - Jul 12, 04:05 UTCJul 12, 04:35 UTC30m
2026-07-12 ZKTZM - Jul 12, 02:10 UTCJul 12, 02:45 UTC35m
2026-07-11 ZKTZM - Jul 11, 23:40 UTCJul 12, 00:20 UTC40m
2026-07-11 ZKTZM - Jul 11, 03:25 UTCJul 11, 03:50 UTC25m
2026-07-11 ZKTZM - Jul 11, 01:00 UTCJul 11, 02:30 UTC1h 30m
2026-07-10 ZKTZM - Jul 10, 23:45 UTCJul 11, 00:10 UTC25m
2026-07-10 ZKTZM - Jul 10, 21:00 UTCJul 10, 21:30 UTC30m
2026-07-10 ZKTZM - Jul 10, 03:30 UTCJul 10, 04:10 UTC40m
2026-07-10 ZKTZM - Jul 10, 01:55 UTCJul 10, 02:50 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-TZM page for operator, model, and routing details .

Mode-S C81A1C frequently asked

What is Mode-S code C81A1C?
C81A1C is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-TZM.
Where is Mode-S C81A1C registered?
Mode-S code C81A1C 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 C81A1C broadcasting right now?
Yes. Mode-S C81A1C is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81A1C, octal 62015034, decimal 13,113,884.
What flights does C81A1C operate?
Mode-S C81A1C has broadcast 1 distinct callsign, including ZKTZM.