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sensors Mode-S transponder

C81A1B

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-SAN · CESSNA 208 Caravan

Hex
C81A1B
Octal
62015033
Decimal
13,113,883
Country
NZ
Tail
ZK-SAN
Type
C208
No current signal · last broadcast Jul 26, 08:40 UTC
Flights observed
534
Distinct callsigns
20
Country
NZ
Last broadcast
Jul 26, 08:40 UTC

Last known position

Most recent position reported by Mode-S C81A1B.

Country allocation

The ICAO 24-bit address C81A1B 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 20 distinct

Callsign Airline Flights Last seen
SDA341 - 25 2026-07-20
SDA342 Sounds Air 20 2026-07-21
SDA347 Sounds Air 19 2026-07-21
SDA343 - 18 2026-07-21
SDA345 Sounds Air 17 2026-07-19
SDA350 - 15 2026-07-21
SDA349 Sounds Air 14 2026-07-21
SDA346 Sounds Air 14 2026-07-20
SDA344 - 14 2026-07-21
SDA348 - 12 2026-07-21
SDA283 - 12 2026-07-15
SDA288 - 10 2026-07-16
SDA287 - 10 2026-07-16
SDA289 - 9 2026-07-16
SDA286 Sounds Air 9 2026-07-26
SDA253 - 9 2026-07-12
SDA358 - 8 2026-07-09
SDA357 Sounds Air 8 2026-07-19
SDA352 Sounds Air 8 2026-07-20
SDA351 Sounds Air 8 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SDA286 BHE → WLG Jul 26, 07:30 UTCJul 26, 08:40 UTC1h 10m
2026-07-26 SDA415 - Jul 26, 06:30 UTCJul 26, 06:50 UTC21m
2026-07-26 SDA504 - Jul 26, 05:25 UTCJul 26, 05:55 UTC30m
2026-07-26 SDA505 - Jul 26, 04:15 UTCJul 26, 04:45 UTC30m
2026-07-26 SDA414 - Jul 26, 03:05 UTCJul 26, 03:25 UTC20m
2026-07-26 SDA285 WLG → BHE Jul 26, 01:30 UTCJul 26, 01:50 UTC20m
2026-07-25 SDA124 BHE → WLG Jul 25, 23:00 UTCJul 26, 00:45 UTC1h 45m
2026-07-25 SDA280 BHE → WLG Jul 25, 21:00 UTCJul 25, 22:10 UTC1h 10m
2026-07-25 SDA124 BHE → WLG Jul 25, 02:20 UTCJul 25, 04:25 UTC2h 5m
2026-07-25 SDA214 BHE → WLG Jul 25, 01:20 UTCJul 25, 01:50 UTC30m
2026-07-24 SDA318 NSN → WLG Jul 24, 23:10 UTCJul 25, 00:35 UTC1h 25m
2026-07-24 SDA317 WLG → NSN Jul 24, 22:00 UTCJul 24, 22:35 UTC35m
2026-07-24 SDA212 BHE → WLG Jul 24, 20:00 UTCJul 24, 21:20 UTC1h 20m
2026-07-24 SDA270 BHE → WLG Jul 24, 19:05 UTCJul 24, 19:25 UTC20m
2026-07-21 SDA344 - Jul 21, 21:50 UTCJul 21, 23:35 UTC1h 45m
2026-07-21 SDA343 - Jul 21, 20:40 UTCJul 21, 21:15 UTC35m
2026-07-21 SDA342 NSN → WLG Jul 21, 18:00 UTCJul 21, 19:45 UTC1h 45m
2026-07-21 SDA350 NSN → WLG Jul 21, 08:00 UTCJul 21, 08:35 UTC35m
2026-07-21 SDA349 WLG → NSN Jul 21, 06:50 UTCJul 21, 07:25 UTC35m
2026-07-21 SDA348 - Jul 21, 05:25 UTCJul 21, 06:00 UTC35m
2026-07-21 SDA347 WLG → NSN Jul 21, 04:10 UTCJul 21, 04:45 UTC35m
2026-07-21 SDA124 BHE → WLG Jul 21, 03:10 UTCJul 21, 03:20 UTC10m
2026-07-21 SDA123 WLG → BHE Jul 21, 02:15 UTCJul 21, 02:35 UTC20m
2026-07-20 SDA242 BHE → WLG Jul 20, 20:25 UTCJul 20, 21:35 UTC1h 10m
2026-07-20 SDA342 NSN → WLG Jul 20, 19:10 UTCJul 20, 19:45 UTC35m
2026-07-20 SDA341 - Jul 20, 18:05 UTCJul 20, 18:35 UTC30m
2026-07-20 SDA352 NSN → WLG Jul 20, 07:30 UTCJul 20, 08:00 UTC30m
2026-07-20 SDA351 WLG → NSN Jul 20, 06:10 UTCJul 20, 06:50 UTC40m
2026-07-20 SDA350 - Jul 20, 04:55 UTCJul 20, 05:30 UTC35m
2026-07-20 SDA349 WLG → NSN Jul 20, 01:50 UTCJul 20, 04:20 UTC2h 30m
2026-07-20 SDA346 NSN → WLG Jul 20, 00:20 UTCJul 20, 00:55 UTC35m
2026-07-19 SDA345 WLG → NSN Jul 19, 23:05 UTCJul 19, 23:40 UTC35m
2026-07-19 SDA344 - Jul 19, 21:50 UTCJul 19, 22:25 UTC35m
2026-07-19 SDA343 - Jul 19, 19:20 UTCJul 19, 21:00 UTC1h 40m
2026-07-19 SDA341 - Jul 19, 18:00 UTCJul 19, 18:40 UTC40m
2026-07-19 SDA359 WLG → NSN Jul 19, 06:10 UTCJul 19, 07:55 UTC1h 45m
2026-07-19 SDA357 WLG → NSN Jul 19, 02:45 UTCJul 19, 05:30 UTC2h 45m
2026-07-17 SDA251 WLG → BHE Jul 17, 00:45 UTCJul 17, 01:09 UTC25m
2026-07-16 SDA274 BHE → WLG Jul 16, 22:49 UTCJul 16, 23:55 UTC1h 5m
2026-07-16 SDA410 - Jul 16, 21:45 UTCJul 16, 22:05 UTC20m
2026-07-16 SDA289 WLG → BHE Jul 16, 07:30 UTCJul 16, 07:55 UTC25m
2026-07-16 SDA288 - Jul 16, 06:30 UTCJul 16, 06:55 UTC25m
2026-07-16 SDA287 - Jul 16, 04:35 UTCJul 16, 05:40 UTC1h 5m
2026-07-15 SDA283 - Jul 15, 23:00 UTCJul 15, 23:50 UTC50m
2026-07-15 SDA343 - Jul 15, 21:40 UTCJul 15, 22:05 UTC25m
2026-07-15 SDA281 - Jul 15, 18:05 UTCJul 15, 20:05 UTC2h 0m
2026-07-15 SDA289 WLG → BHE Jul 15, 07:10 UTCJul 15, 07:40 UTC30m
2026-07-15 SDA288 BHE → WLG Jul 15, 06:05 UTCJul 15, 06:30 UTC25m
2026-07-15 SDA286 - Jul 15, 04:20 UTCJul 15, 05:25 UTC1h 5m
2026-07-14 SDA283 WLG → BHE Jul 14, 23:05 UTCJul 14, 23:35 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-SAN page for operator, model, and routing details .

Mode-S C81A1B frequently asked

What is Mode-S code C81A1B?
C81A1B is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-SAN.
Where is Mode-S C81A1B registered?
Mode-S code C81A1B 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 C81A1B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 08:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81A1B, octal 62015033, decimal 13,113,883.
What flights does C81A1B operate?
Mode-S C81A1B has broadcast 20 distinct callsigns, including SDA341, SDA342, SDA347, SDA343, SDA345.