Apparatus

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sensors Mode-S transponder

C81E79

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-SKL · BEECH 90 King Air

Hex
C81E79
Octal
62017171
Decimal
13,115,001
Country
NZ
Tail
ZK-SKL
Type
BE9L
No current signal · last broadcast Jul 24, 04:55 UTC
Flights observed
261
Distinct callsigns
1
Country
NZ
Last broadcast
Jul 24, 04:55 UTC

Last known position

Most recent position reported by Mode-S C81E79.

Country allocation

The ICAO 24-bit address C81E79 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
GIS1 - 261 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 GIS1 - Jul 24, 04:20 UTCJul 24, 04:55 UTC35m
2026-07-23 GIS1 - Jul 23, 23:30 UTCJul 24, 00:05 UTC35m
2026-07-23 GIS1 - Jul 23, 07:40 UTCJul 23, 08:50 UTC1h 10m
2026-07-23 GIS1 - Jul 23, 04:15 UTCJul 23, 05:05 UTC50m
2026-07-22 GIS1 - Jul 22, 03:15 UTCJul 22, 03:55 UTC40m
2026-07-21 GIS1 - Jul 21, 06:25 UTCJul 21, 06:55 UTC30m
2026-07-21 GIS1 - Jul 21, 02:55 UTCJul 21, 03:30 UTC35m
2026-07-21 GIS1 - Jul 21, 01:30 UTCJul 21, 02:05 UTC35m
2026-07-20 GIS1 - Jul 20, 20:55 UTCJul 20, 21:30 UTC35m
2026-07-19 GIS1 - Jul 19, 04:45 UTCJul 19, 05:15 UTC30m
2026-07-19 GIS1 - Jul 19, 01:35 UTCJul 19, 02:15 UTC40m
2026-07-18 GIS1 - Jul 18, 01:54 UTCJul 18, 02:25 UTC30m
2026-07-17 GIS1 - Jul 17, 23:39 UTCJul 18, 00:19 UTC40m
2026-07-17 GIS1 - Jul 17, 06:54 UTCJul 17, 07:25 UTC30m
2026-07-17 GIS1 - Jul 17, 03:55 UTCJul 17, 04:35 UTC40m
2026-07-17 GIS1 - Jul 17, 01:45 UTCJul 17, 02:15 UTC30m
2026-07-16 GIS1 - Jul 16, 23:35 UTCJul 17, 00:14 UTC40m
2026-07-16 GIS1 - Jul 16, 07:35 UTCJul 16, 08:25 UTC50m
2026-07-16 GIS1 - Jul 16, 05:00 UTCJul 16, 06:00 UTC1h 0m
2026-07-16 GIS1 - Jul 16, 02:10 UTCJul 16, 02:55 UTC45m
2026-07-15 GIS1 - Jul 15, 23:15 UTCJul 16, 00:10 UTC55m
2026-07-14 GIS1 - Jul 14, 03:25 UTCJul 14, 03:55 UTC30m
2026-07-14 GIS1 - Jul 14, 00:15 UTCJul 14, 00:50 UTC35m
2026-07-13 GIS1 - Jul 13, 05:10 UTCJul 13, 05:45 UTC35m
2026-07-13 GIS1 - Jul 13, 03:15 UTCJul 13, 03:50 UTC35m
2026-07-12 GIS1 - Jul 12, 05:20 UTCJul 12, 06:15 UTC55m
2026-07-12 GIS1 - Jul 12, 03:10 UTCJul 12, 04:10 UTC1h 0m
2026-07-12 GIS1 - Jul 12, 01:05 UTCJul 12, 01:40 UTC35m
2026-07-11 GIS1 - Jul 11, 08:35 UTCJul 11, 09:10 UTC35m
2026-07-11 GIS1 - Jul 11, 05:55 UTCJul 11, 06:30 UTC35m
2026-07-11 GIS1 - Jul 11, 03:05 UTCJul 11, 03:40 UTC35m
2026-07-10 GIS1 - Jul 10, 23:30 UTCJul 11, 00:05 UTC35m
2026-07-10 GIS1 - Jul 10, 02:35 UTCJul 10, 03:25 UTC50m
2026-07-09 GIS1 - Jul 9, 23:55 UTCJul 10, 00:40 UTC45m
2026-07-09 GIS1 - Jul 9, 08:00 UTCJul 9, 08:55 UTC55m
2026-07-09 GIS1 - Jul 9, 04:35 UTCJul 9, 05:30 UTC55m
2026-07-09 GIS1 - Jul 9, 01:55 UTCJul 9, 02:35 UTC40m
2026-07-08 GIS1 - Jul 8, 23:05 UTCJul 8, 23:40 UTC35m
2026-07-08 GIS1 - Jul 8, 11:05 UTCJul 8, 11:40 UTC35m
2026-07-08 GIS1 - Jul 8, 08:40 UTCJul 8, 09:15 UTC35m
2026-07-08 GIS1 - Jul 8, 06:00 UTCJul 8, 06:35 UTC35m
2026-07-08 GIS1 - Jul 8, 03:50 UTCJul 8, 04:25 UTC35m
2026-07-08 GIS1 - Jul 8, 02:10 UTCJul 8, 02:40 UTC30m
2026-07-08 GIS1 - Jul 8, 00:00 UTCJul 8, 00:35 UTC35m
2026-07-07 GIS1 - Jul 7, 07:05 UTCJul 7, 07:55 UTC50m
2026-07-07 GIS1 - Jul 7, 01:25 UTCJul 7, 02:20 UTC55m
2026-07-07 GIS1 - Jul 7, 00:10 UTCJul 7, 00:45 UTC35m
2026-07-06 GIS1 - Jul 6, 22:05 UTCJul 6, 22:40 UTC35m
2026-07-06 GIS1 - Jul 6, 04:30 UTCJul 6, 05:20 UTC50m
2026-07-06 GIS1 - Jul 6, 00:45 UTCJul 6, 01:45 UTC1h 0m

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

Mode-S C81E79 frequently asked

What is Mode-S code C81E79?
C81E79 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-SKL.
Where is Mode-S C81E79 registered?
Mode-S code C81E79 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 C81E79 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 04:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81E79, octal 62017171, decimal 13,115,001.
What flights does C81E79 operate?
Mode-S C81E79 has broadcast 1 distinct callsign, including GIS1.