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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 Jul 24, 09:20 UTC
Flights observed
402
Distinct callsigns
20
Country
NZ
Last broadcast
Jul 24, 09:20 UTC

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
SDA342 Sounds Air 13 2026-07-23
SDA350 - 12 2026-07-17
SDA349 - 12 2026-07-17
SDA348 - 12 2026-07-17
SDA347 - 12 2026-07-17
SDA343 Sounds Air 12 2026-07-22
SDA341 Sounds Air 12 2026-07-23
SDA345 - 10 2026-06-24
SDA280 Sounds Air 10 2026-07-22
SDA344 - 9 2026-07-22
SDA289 Sounds Air 9 2026-07-23
SDA286 Sounds Air 9 2026-07-23
SDA253 Sounds Air 9 2026-07-17
SDA121 - 9 2026-07-16
SDA287 Sounds Air 8 2026-07-23
SDA285 - 8 2026-07-19
SDA281 - 8 2026-07-22
SDA251 - 8 2026-07-03
SDA123 Sounds Air 8 2026-07-18
SDA357 Sounds Air 7 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 SDA269 WLG → BHE Jul 24, 08:55 UTCJul 24, 09:20 UTC25m
2026-07-24 SDA267 WLG → BHE Jul 24, 07:15 UTCJul 24, 08:20 UTC1h 5m
2026-07-24 SDA266 BHE → WLG Jul 24, 06:30 UTCJul 24, 07:10 UTC40m
2026-07-24 SDA265 WLG → BHE Jul 24, 05:30 UTCJul 24, 05:50 UTC20m
2026-07-24 SDA276 BHE → WLG Jul 24, 04:35 UTCJul 24, 04:55 UTC20m
2026-07-23 SDA263 WLG → BHE Jul 23, 23:10 UTCJul 23, 23:35 UTC25m
2026-07-23 SDA261 WLG → BHE Jul 23, 21:35 UTCJul 23, 22:45 UTC1h 10m
2026-07-23 SDA342 NSN → WLG Jul 23, 19:45 UTCJul 23, 20:45 UTC1h 0m
2026-07-23 SDA341 WLG → NSN Jul 23, 19:05 UTCJul 23, 19:15 UTC10m
2026-07-23 SDA260 - Jul 23, 18:00 UTCJul 23, 18:20 UTC20m
2026-07-23 SDA289 WLG → BHE Jul 23, 07:35 UTCJul 23, 07:55 UTC20m
2026-07-23 SDA288 BHE → WLG Jul 23, 06:25 UTCJul 23, 06:40 UTC15m
2026-07-23 SDA287 WLG → BHE Jul 23, 05:15 UTCJul 23, 05:40 UTC25m
2026-07-23 SDA286 BHE → WLG Jul 23, 04:35 UTCJul 23, 04:55 UTC20m
2026-07-22 SDA283 WLG → BHE Jul 22, 23:15 UTCJul 22, 23:35 UTC20m
2026-07-22 SDA344 - Jul 22, 21:50 UTCJul 22, 22:15 UTC25m
2026-07-22 SDA343 WLG → NSN Jul 22, 20:40 UTCJul 22, 21:20 UTC40m
2026-07-22 SDA281 WLG → WLG Jul 22, 18:40 UTCJul 22, 19:40 UTC1h 0m
2026-07-22 SDA280 BHE → WLG Jul 22, 18:10 UTCJul 22, 18:30 UTC20m
2026-07-22 SDA286 - Jul 22, 04:30 UTCJul 22, 04:50 UTC20m
2026-07-19 SDA287 WLG → BHE Jul 19, 08:20 UTCJul 19, 08:40 UTC20m
2026-07-19 SDA286 BHE → WLG Jul 19, 07:25 UTCJul 19, 07:45 UTC20m
2026-07-19 SDA415 - Jul 19, 06:25 UTCJul 19, 06:45 UTC20m
2026-07-19 SDA504 - Jul 19, 05:00 UTCJul 19, 05:30 UTC30m
2026-07-19 SDA505 - Jul 19, 03:55 UTCJul 19, 04:25 UTC30m
2026-07-19 SDA414 - Jul 19, 03:00 UTCJul 19, 03:20 UTC20m
2026-07-19 SDA285 WLG → BHE Jul 19, 01:30 UTCJul 19, 01:50 UTC20m
2026-07-18 SDA354 - Jul 18, 23:45 UTCJul 19, 00:20 UTC35m
2026-07-18 SDA353 WLG → NSN Jul 18, 22:35 UTCJul 18, 23:05 UTC30m
2026-07-18 SDA352 NSN → WLG Jul 18, 21:10 UTCJul 18, 21:35 UTC25m
2026-07-18 SDA351 - Jul 18, 20:05 UTCJul 18, 20:30 UTC25m
2026-07-18 SDA259 - Jul 18, 05:10 UTCJul 18, 06:20 UTC1h 10m
2026-07-18 SDA123 WLG → BHE Jul 18, 03:20 UTCJul 18, 03:40 UTC20m
2026-07-18 SDA257 WLG → WLG Jul 18, 01:39 UTCJul 18, 02:40 UTC1h 0m
2026-07-17 SDA254 - Jul 17, 22:29 UTCJul 17, 22:45 UTC15m
2026-07-17 SDA253 WLG → BHE Jul 17, 21:25 UTCJul 17, 21:44 UTC20m
2026-07-17 SDA342 NSN → WLG Jul 17, 19:00 UTCJul 17, 20:35 UTC1h 35m
2026-07-17 SDA350 - Jul 17, 08:04 UTCJul 17, 08:40 UTC35m
2026-07-17 SDA349 - Jul 17, 06:54 UTCJul 17, 07:30 UTC35m
2026-07-17 SDA348 - Jul 17, 05:30 UTCJul 17, 06:05 UTC35m
2026-07-17 SDA347 - Jul 17, 04:25 UTCJul 17, 04:59 UTC35m
2026-07-17 SDA124 - Jul 17, 03:14 UTCJul 17, 03:25 UTC10m
2026-07-17 SDA123 WLG → PCN Jul 17, 02:15 UTCJul 17, 02:34 UTC20m
2026-07-16 SDA358 - Jul 16, 23:20 UTCJul 16, 23:55 UTC35m
2026-07-16 SDA357 WLG → NSN Jul 16, 22:10 UTCJul 16, 22:45 UTC35m
2026-07-16 SDA122 PCN → WLG Jul 16, 21:10 UTCJul 16, 21:25 UTC15m
2026-07-16 SDA121 WLG → PCN Jul 16, 20:15 UTCJul 16, 20:39 UTC25m
2026-07-16 SDA250 - Jul 16, 19:20 UTCJul 16, 19:40 UTC20m
2026-07-12 SDAY - Jul 12, 23:50 UTCJul 13, 00:35 UTC45m
2026-07-12 SDA265 - Jul 12, 22:30 UTCJul 12, 22:55 UTC25m

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 Jul 24, 09:20 UTC.
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 SDA342, SDA350, SDA349, SDA348, SDA347.