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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
Broadcasting now · callsign SDA257 · 200 ft
Flights observed
267
Distinct callsigns
20
Country
NZ
Last broadcast
50m ago

Current position

C81AC5 is currently broadcasting. Map zoomed to live position.

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 Sounds Air 12 2026-05-15
SDA350 Sounds Air 11 2026-05-21
SDA349 Sounds Air 11 2026-05-21
SDA348 Sounds Air 11 2026-05-21
SDA347 Sounds Air 10 2026-05-21
SDA342 Sounds Air 9 2026-05-13
SDA283 Sounds Air 7 2026-05-23
SDA271 Sounds Air 7 2026-05-21
SDA287 Sounds Air 6 2026-05-20
SDA281 Sounds Air 6 2026-05-23
SDA280 Sounds Air 6 2026-05-23
SDA241 Sounds Air 6 2026-05-20
SDA123 Sounds Air 6 2026-05-15
SDA121 Sounds Air 6 2026-05-29
SDA343 Sounds Air 5 2026-05-19
SDA286 Sounds Air 5 2026-05-20
SDA285 Sounds Air 5 2026-05-20
SDA282 Sounds Air 5 2026-05-20
SDA253 Sounds Air 5 2026-05-15
SDA122 Sounds Air 5 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 SDA122 PCN → WLG May 30, 00:40 UTCMay 30, 00:45 UTC5m
2026-05-29 SDA121 WLG → PCN May 29, 23:45 UTCMay 29, 23:50 UTC5m
2026-05-29 SDA313 WLG → NSN May 29, 05:50 UTCMay 29, 06:00 UTC10m
2026-05-29 SDA501 - May 29, 03:25 UTCMay 29, 03:35 UTC10m
2026-05-23 SDA283 WLG → BHE May 23, 23:55 UTCMay 24, 00:00 UTC5m
2026-05-23 SDA281 WLG → BHE May 23, 21:50 UTCMay 23, 22:00 UTC10m
2026-05-23 SDA280 BHE → WLG May 23, 21:20 UTCMay 23, 21:25 UTC5m
2026-05-22 SDA502 - May 22, 07:25 UTCMay 22, 08:10 UTC45m
2026-05-22 SDA313 WLG → NSN May 22, 05:30 UTCMay 22, 05:40 UTC10m
2026-05-22 SDA312 NSN → WLG May 22, 04:55 UTCMay 22, 05:00 UTC5m
2026-05-22 SDA251 WLG → BHE May 22, 00:40 UTCMay 22, 00:45 UTC5m
2026-05-21 SDA411 - May 21, 22:45 UTCMay 21, 22:55 UTC10m
2026-05-21 SDA273 WLG → BHE May 21, 20:30 UTCMay 21, 20:40 UTC10m
2026-05-21 SDA272 BHE → WLG May 21, 19:55 UTCMay 21, 20:05 UTC10m
2026-05-21 SDA271 WLG → BHE May 21, 18:55 UTCMay 21, 19:05 UTC10m
2026-05-21 SDA350 NSN → WLG May 21, 08:30 UTCMay 21, 08:40 UTC10m
2026-05-21 SDA349 WLG → NSN May 21, 06:55 UTCMay 21, 07:05 UTC10m
2026-05-21 SDA348 NSN → WLG May 21, 05:45 UTCMay 21, 05:55 UTC10m
2026-05-21 SDA347 WLG → NSN May 21, 04:15 UTCMay 21, 04:25 UTC10m
2026-05-21 SDA244 BHE → WLG May 21, 01:20 UTCMay 21, 01:30 UTC10m
2026-05-21 SDA243 WLG → BHE May 21, 00:05 UTCMay 21, 00:20 UTC15m
2026-05-20 SDA122 PCN → WLG May 20, 23:30 UTCMay 20, 23:35 UTC5m
2026-05-20 SDA121 WLG → PCN May 20, 22:20 UTCMay 20, 22:30 UTC10m
2026-05-20 SDA241 WLG → BHE May 20, 20:35 UTCMay 20, 20:55 UTC20m
2026-05-20 SDA282 BHE → WLG May 20, 20:00 UTCMay 20, 20:10 UTC10m
2026-05-20 SDA280 BHE → WLG May 20, 18:20 UTCMay 20, 18:30 UTC10m
2026-05-20 SDA289 WLG → BHE May 20, 07:25 UTCMay 20, 07:35 UTC10m
2026-05-20 SDA288 BHE → WLG May 20, 06:30 UTCMay 20, 06:40 UTC10m
2026-05-20 SDA287 WLG → BHE May 20, 05:20 UTCMay 20, 05:30 UTC10m
2026-05-20 SDA286 BHE → WLG May 20, 04:45 UTCMay 20, 04:50 UTC5m
2026-05-20 SDA285 WLG → BHE May 20, 03:45 UTCMay 20, 03:50 UTC5m
2026-05-19 SDA344 NSN → WLG May 19, 22:00 UTCMay 19, 22:10 UTC10m
2026-05-19 SDA343 WLG → NSN May 19, 20:35 UTCMay 19, 20:45 UTC10m
2026-05-19 SDA289 WLG → BHE May 19, 07:20 UTCMay 19, 07:30 UTC10m
2026-05-19 SDA287 WLG → BHE May 19, 05:15 UTCMay 19, 05:25 UTC10m
2026-05-19 SDA286 BHE → WLG May 19, 04:45 UTCMay 19, 04:50 UTC5m
2026-05-18 SDA271 WLG → BHE May 18, 07:40 UTCMay 18, 07:50 UTC10m
2026-05-18 SDA268 BHE → WLG May 18, 05:00 UTCMay 18, 05:05 UTC5m
2026-05-18 SDA267 WLG → BHE May 18, 03:55 UTCMay 18, 04:05 UTC10m
2026-05-18 SDA412 - May 18, 00:35 UTCMay 18, 00:45 UTC10m
2026-05-17 SDA265 WLG → BHE May 17, 22:45 UTCMay 17, 22:55 UTC10m
2026-05-17 SDA264 BHE → WLG May 17, 21:55 UTCMay 17, 22:05 UTC10m
2026-05-17 SDA261 WLG → BHE May 17, 18:55 UTCMay 17, 19:10 UTC15m
2026-05-17 SDA260 BHE → WLG May 17, 18:35 UTCMay 17, 18:40 UTC5m
2026-05-17 SDA287 WLG → BHE May 17, 08:30 UTCMay 17, 08:40 UTC10m
2026-05-17 SDA286 BHE → WLG May 17, 07:50 UTCMay 17, 07:55 UTC5m
2026-05-17 SDA505 - May 17, 04:05 UTCMay 17, 04:15 UTC10m
2026-05-17 SDA285 WLG → BHE May 17, 02:00 UTCMay 17, 02:10 UTC10m
2026-05-17 SDA284 BHE → WLG May 17, 01:00 UTCMay 17, 01:10 UTC10m
2026-05-16 SDA283 WLG → BHE May 16, 23:50 UTCMay 17, 00:00 UTC10m

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?
Yes. Mode-S C81AC5 is currently airborne.
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, SDA350, SDA349, SDA348, SDA347.