Apparatus

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sensors Mode-S transponder

C81AB7

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-SAY · CESSNA 208 Caravan

Hex
C81AB7
Octal
62015267
Decimal
13,114,039
Country
NZ
Tail
ZK-SAY
Type
C208
No current signal · last broadcast 6h ago
Flights observed
135
Distinct callsigns
20
Country
NZ
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S C81AB7.

Country allocation

The ICAO 24-bit address C81AB7 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
SDA345 Sounds Air 6 2026-05-22
SDA343 Sounds Air 6 2026-05-20
SDA285 Sounds Air 6 2026-05-28
SDA347 Sounds Air 5 2026-05-27
SDA289 Sounds Air 5 2026-05-28
SDA251 Sounds Air 5 2026-05-29
SDA341 Sounds Air 4 2026-05-20
SDA287 Sounds Air 4 2026-05-24
SDA253 Sounds Air 4 2026-04-28
SDA123 Sounds Air 4 2026-05-23
SDA349 Sounds Air 3 2026-05-20
SDA348 Sounds Air 3 2026-05-27
SDA344 Sounds Air 3 2026-05-03
SDA342 Sounds Air 3 2026-05-20
SDA267 Sounds Air 3 2026-05-29
SDA254 Sounds Air 3 2026-04-28
SDA250 Sounds Air 3 2026-05-28
SDA124 Sounds Air 3 2026-05-24
SDA122 Sounds Air 3 2026-05-26
SDA121 Sounds Air 3 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 SDA213 WLG → BHE May 30, 00:05 UTCMay 30, 00:15 UTC10m
2026-05-29 SDA318 NSN → WLG May 29, 23:35 UTCMay 29, 23:40 UTC5m
2026-05-29 SDA212 BHE → WLG May 29, 21:05 UTCMay 29, 21:15 UTC10m
2026-05-29 SDA271 WLG → BHE May 29, 19:55 UTCMay 29, 20:10 UTC15m
2026-05-29 SDA270 BHE → WLG May 29, 19:15 UTCMay 29, 19:25 UTC10m
2026-05-29 SDA267 WLG → BHE May 29, 06:55 UTCMay 29, 07:35 UTC40m
2026-05-29 SDA251 WLG → BHE May 29, 00:35 UTCMay 29, 00:45 UTC10m
2026-05-28 SDA357 WLG → NSN May 28, 22:00 UTCMay 28, 22:10 UTC10m
2026-05-28 SDA250 BHE → WLG May 28, 19:20 UTCMay 28, 19:35 UTC15m
2026-05-28 SDA289 WLG → BHE May 28, 07:35 UTCMay 28, 07:45 UTC10m
2026-05-28 SDA288 BHE → WLG May 28, 06:45 UTCMay 28, 06:50 UTC5m
2026-05-28 SDA285 WLG → BHE May 28, 05:05 UTCMay 28, 05:50 UTC45m
2026-05-27 SDAY - May 27, 22:25 UTCMay 27, 22:40 UTC15m
2026-05-27 SDA348 NSN → WLG May 27, 05:45 UTCMay 27, 05:55 UTC10m
2026-05-27 SDA347 WLG → NSN May 27, 04:19 UTCMay 27, 04:24 UTC5m
2026-05-27 SDA244 BHE → WLG May 27, 01:24 UTCMay 27, 01:34 UTC10m
2026-05-27 SDA243 WLG → BHE May 27, 00:04 UTCMay 27, 00:14 UTC10m
2026-05-26 SDA122 PCN → WLG May 26, 23:14 UTCMay 26, 23:19 UTC5m
2026-05-26 SDA121 WLG → PCN May 26, 22:15 UTCMay 26, 22:25 UTC10m
2026-05-26 SDA242 BHE → WLG May 26, 21:29 UTCMay 26, 21:34 UTC5m
2026-05-26 SDA280 BHE → WLG May 26, 18:14 UTCMay 26, 18:24 UTC10m
2026-05-25 SDA270 BHE → WLG May 25, 06:25 UTCMay 25, 06:40 UTC15m
2026-05-25 SDA269 WLG → BHE May 25, 05:20 UTCMay 25, 05:30 UTC10m
2026-05-25 SDA268 BHE → WLG May 25, 04:45 UTCMay 25, 04:50 UTC5m
2026-05-25 SDA267 WLG → BHE May 25, 03:45 UTCMay 25, 03:55 UTC10m
2026-05-24 SDA262 BHE → WLG May 24, 20:30 UTCMay 24, 20:35 UTC5m
2026-05-24 SDA260 BHE → WLG May 24, 18:25 UTCMay 24, 18:35 UTC10m
2026-05-24 SDA287 WLG → BHE May 24, 08:15 UTCMay 24, 08:25 UTC10m
2026-05-24 SDA505 - May 24, 04:00 UTCMay 24, 04:10 UTC10m
2026-05-24 SDA251 WLG → BHE May 24, 00:40 UTCMay 24, 00:50 UTC10m
2026-05-24 SDA124 BHE → WLG May 24, 00:10 UTCMay 24, 00:20 UTC10m
2026-05-23 SDA123 WLG → BHE May 23, 23:05 UTCMay 23, 23:15 UTC10m
2026-05-23 SDA348 NSN → WLG May 23, 06:35 UTCMay 23, 06:45 UTC10m
2026-05-23 SDA347 WLG → NSN May 23, 04:45 UTCMay 23, 05:00 UTC15m
2026-05-23 SDA214 BHE → WLG May 23, 01:35 UTCMay 23, 02:15 UTC40m
2026-05-22 SDA265 WLG → BHE May 22, 05:30 UTCMay 22, 05:40 UTC10m
2026-05-22 SDA345 WLG → NSN May 22, 01:20 UTCMay 22, 01:30 UTC10m
2026-05-21 SDA289 WLG → BHE May 21, 07:20 UTCMay 21, 07:30 UTC10m
2026-05-21 SDA287 WLG → BHE May 21, 05:10 UTCMay 21, 05:20 UTC10m
2026-05-21 SDA285 WLG → BHE May 21, 03:30 UTCMay 21, 03:45 UTC15m
2026-05-21 SDA346 NSN → WLG May 21, 02:40 UTCMay 21, 02:50 UTC10m
2026-05-21 SDA345 WLG → NSN May 21, 01:05 UTCMay 21, 01:15 UTC10m
2026-05-20 SDA343 WLG → NSN May 20, 20:25 UTCMay 20, 20:35 UTC10m
2026-05-20 SDA342 NSN → WLG May 20, 19:40 UTCMay 20, 19:50 UTC10m
2026-05-20 SDA341 WLG → NSN May 20, 18:05 UTCMay 20, 18:15 UTC10m
2026-05-20 SDA350 NSN → WLG May 20, 08:30 UTCMay 20, 08:40 UTC10m
2026-05-20 SDA349 WLG → NSN May 20, 07:10 UTCMay 20, 07:20 UTC10m
2026-05-20 SDA348 NSN → WLG May 20, 05:35 UTCMay 20, 05:45 UTC10m
2026-05-20 SDA347 WLG → NSN May 20, 04:15 UTCMay 20, 04:25 UTC10m
2026-05-20 SDA123 WLG → BHE May 20, 02:15 UTCMay 20, 02:20 UTC5m

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

Mode-S C81AB7 frequently asked

What is Mode-S code C81AB7?
C81AB7 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-SAY.
Where is Mode-S C81AB7 registered?
Mode-S code C81AB7 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 C81AB7 broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81AB7, octal 62015267, decimal 13,114,039.
What flights does C81AB7 operate?
Mode-S C81AB7 has broadcast 20 distinct callsigns, including SDA345, SDA343, SDA285, SDA347, SDA289.