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sensors Mode-S transponder

C81AC5

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-SAA · CESSNA 208 Caravan

Hex
C81AC5
Octal
62015305
Decimal
13,114,053
Country
NZ
Tail
ZK-SAA
Type
C208
No current signal · last broadcast Jul 26, 20:40 UTC
Flights observed
574
Distinct callsigns
20
Country
NZ
Last broadcast
Jul 26, 20:40 UTC

Last known position

Most recent position reported by Mode-S C81AC5.

Country allocation

The ICAO 24-bit address C81AC5 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 - 24 2026-07-16
SDA342 Sounds Air 22 2026-07-22
SDA347 Sounds Air 20 2026-07-23
SDA350 Sounds Air 19 2026-07-23
SDA349 Sounds Air 19 2026-07-23
SDA348 Sounds Air 19 2026-07-23
SDA123 Sounds Air 14 2026-07-22
SDA283 - 13 2026-07-13
SDA281 - 13 2026-07-18
SDA280 Sounds Air 13 2026-07-21
SDA121 Sounds Air 13 2026-07-22
SDA287 - 12 2026-07-14
SDA271 Sounds Air 12 2026-07-23
SDA241 Sounds Air 12 2026-07-22
SDA343 - 10 2026-07-08
SDA286 - 10 2026-07-12
SDA282 - 10 2026-07-21
SDA253 Sounds Air 10 2026-07-26
SDA289 - 9 2026-07-14
SDA254 Sounds Air 9 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SDA262 BHE → WLG Jul 26, 20:20 UTCJul 26, 20:40 UTC20m
2026-07-26 SDA261 WLG → BHE Jul 26, 19:05 UTCJul 26, 19:30 UTC25m
2026-07-26 SDA260 BHE → WLG Jul 26, 18:25 UTCJul 26, 18:45 UTC20m
2026-07-26 SDA255 WLG → BHE Jul 26, 06:50 UTCJul 26, 07:55 UTC1h 5m
2026-07-26 SDA253 WLG → BHE Jul 26, 06:00 UTCJul 26, 06:20 UTC20m
2026-07-26 SDA126 PCN → WLG Jul 26, 04:55 UTCJul 26, 05:15 UTC20m
2026-07-26 SDA125 WLG → PCN Jul 26, 04:00 UTCJul 26, 04:20 UTC20m
2026-07-26 SDA252 BHE → WLG Jul 26, 02:35 UTCJul 26, 02:55 UTC20m
2026-07-25 SDA259 WLG → BHE Jul 25, 05:15 UTCJul 25, 05:35 UTC20m
2026-07-25 SDA345 WLG → NSN Jul 25, 02:15 UTCJul 25, 04:00 UTC1h 45m
2026-07-24 SDA254 BHE → WLG Jul 24, 23:15 UTCJul 24, 23:45 UTC30m
2026-07-24 SDA295 WLG → BHE Jul 24, 21:15 UTCJul 24, 21:35 UTC20m
2026-07-24 SDA294 BHE → WLG Jul 24, 20:15 UTCJul 24, 20:35 UTC20m
2026-07-24 SDA413 - Jul 24, 08:15 UTCJul 24, 08:35 UTC20m
2026-07-24 SDA313 WLG → NSN Jul 24, 05:55 UTCJul 24, 07:35 UTC1h 40m
2026-07-24 SDA312 NSN → WLG Jul 24, 04:45 UTCJul 24, 05:20 UTC35m
2026-07-24 SDA501 - Jul 24, 03:25 UTCJul 24, 04:05 UTC40m
2026-07-24 SDA412 - Jul 24, 02:15 UTCJul 24, 02:45 UTC30m
2026-07-24 SDA251 WLG → BHE Jul 24, 00:55 UTCJul 24, 01:20 UTC25m
2026-07-23 SDA411 - Jul 23, 22:40 UTCJul 24, 00:00 UTC1h 20m
2026-07-23 SDA410 - Jul 23, 21:40 UTCJul 23, 22:05 UTC25m
2026-07-23 SDA273 WLG → BHE Jul 23, 20:45 UTCJul 23, 21:10 UTC25m
2026-07-23 SDA272 BHE → WLG Jul 23, 19:40 UTCJul 23, 20:10 UTC30m
2026-07-23 SDA271 WLG → BHE Jul 23, 18:40 UTCJul 23, 19:05 UTC25m
2026-07-23 SDA350 NSN → WLG Jul 23, 08:00 UTCJul 23, 08:35 UTC35m
2026-07-23 SDA349 WLG → NSN Jul 23, 06:55 UTCJul 23, 07:20 UTC25m
2026-07-23 SDA348 NSN → WLG Jul 23, 05:15 UTCJul 23, 05:45 UTC30m
2026-07-23 SDA347 WLG → NSN Jul 23, 04:05 UTCJul 23, 04:40 UTC35m
2026-07-22 SDA122 PCN → WLG Jul 22, 23:10 UTCJul 22, 23:30 UTC20m
2026-07-22 SDA121 WLG → PCN Jul 22, 22:15 UTCJul 22, 22:40 UTC25m
2026-07-22 SDA241 WLG → BHE Jul 22, 20:30 UTCJul 22, 21:40 UTC1h 10m
2026-07-22 SDA342 NSN → WLG Jul 22, 18:05 UTCJul 22, 19:40 UTC1h 35m
2026-07-22 SDA347 WLG → NSN Jul 22, 04:20 UTCJul 22, 04:55 UTC35m
2026-07-22 SDA124 BHE → WLG Jul 22, 03:15 UTCJul 22, 03:25 UTC10m
2026-07-22 SDA123 WLG → BHE Jul 22, 02:20 UTCJul 22, 02:25 UTC5m
2026-07-21 SDA242 BHE → WLG Jul 21, 20:25 UTCJul 21, 21:30 UTC1h 5m
2026-07-21 SDA282 - Jul 21, 18:50 UTCJul 21, 19:50 UTC1h 0m
2026-07-21 SDA280 BHE → WLG Jul 21, 18:05 UTCJul 21, 18:30 UTC25m
2026-07-19 SDA255 WLG → BHE Jul 19, 07:35 UTCJul 19, 07:55 UTC20m
2026-07-19 SDA254 BHE → WLG Jul 19, 05:50 UTCJul 19, 07:05 UTC1h 15m
2026-07-19 SDA125 WLG → PCN Jul 19, 04:00 UTCJul 19, 05:05 UTC1h 5m
2026-07-18 SDA123 WLG → BHE Jul 18, 23:45 UTCJul 19, 00:55 UTC1h 10m
2026-07-18 SDA282 BHE → WLG Jul 18, 22:55 UTCJul 18, 23:20 UTC25m
2026-07-18 SDA281 - Jul 18, 21:50 UTCJul 18, 22:10 UTC20m
2026-07-18 SDA280 - Jul 18, 21:00 UTCJul 18, 21:20 UTC20m
2026-07-17 SDA413 - Jul 17, 08:04 UTCJul 17, 08:25 UTC20m
2026-07-17 SDA502 - Jul 17, 06:40 UTCJul 17, 06:54 UTC15m
2026-07-17 SDA313 WLG → NSN Jul 17, 05:30 UTCJul 17, 06:05 UTC35m
2026-07-17 SDA312 NSN → WLG Jul 17, 04:10 UTCJul 17, 04:39 UTC30m
2026-07-17 SDA501 - Jul 17, 02:59 UTCJul 17, 03:30 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-SAA page for operator, model, and routing details .

Mode-S C81AC5 frequently asked

What is Mode-S code C81AC5?
C81AC5 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-SAA.
Where is Mode-S C81AC5 registered?
Mode-S code C81AC5 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 C81AC5 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81AC5, octal 62015305, decimal 13,114,053.
What flights does C81AC5 operate?
Mode-S C81AC5 has broadcast 20 distinct callsigns, including SDA341, SDA342, SDA347, SDA350, SDA349.