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sensors Mode-S transponder

C81919

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-SWX · CESSNA 172 Skyhawk

Hex
C81919
Octal
62014431
Decimal
13,113,625
Country
NZ
Tail
ZK-SWX
Type
C172
No current signal · last broadcast Jul 26, 21:40 UTC
Flights observed
101
Distinct callsigns
1
Country
NZ
Last broadcast
Jul 26, 21:40 UTC

Last known position

Most recent position reported by Mode-S C81919.

Country allocation

The ICAO 24-bit address C81919 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 1 distinct

Callsign Airline Flights Last seen
ZKSWX - 100 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ZKSWX - Jul 26, 20:55 UTCJul 26, 21:40 UTC45m
2026-07-23 ZKSWX - Jul 23, 23:30 UTCJul 24, 01:45 UTC2h 15m
2026-07-23 ZKSWX - Jul 23, 20:50 UTCJul 23, 21:35 UTC45m
2026-07-22 ZKSWX - Jul 22, 03:10 UTCJul 22, 04:45 UTC1h 35m
2026-07-21 ZKSWX AMZ → AMZ Jul 21, 23:10 UTCJul 22, 00:00 UTC50m
2026-07-21 ZKSWX - Jul 21, 06:05 UTCJul 21, 06:55 UTC50m
2026-07-21 ZKSWX - Jul 21, 02:40 UTCJul 21, 03:30 UTC50m
2026-07-21 ZKSWX - Jul 21, 00:40 UTCJul 21, 01:15 UTC35m
2026-07-20 ZKSWX - Jul 20, 23:05 UTCJul 20, 23:45 UTC40m
2026-07-20 ZKSWX AMZ → AMZ Jul 20, 20:50 UTCJul 20, 21:50 UTC1h 0m
2026-07-17 ZKSWX - Jul 17, 02:10 UTCJul 17, 02:25 UTC15m
2026-07-17 ZKSWX - Jul 17, 01:25 UTCJul 17, 01:39 UTC15m
2026-07-16 ZKSWX - Jul 16, 04:20 UTCJul 16, 04:30 UTC10m
2026-07-14 ZKSWX - Jul 14, 23:40 UTCJul 15, 00:40 UTC1h 0m
2026-07-08 ZKSWX - Jul 8, 05:55 UTCJul 8, 06:55 UTC1h 0m
2026-07-03 ZKSWX - Jul 3, 03:45 UTCJul 3, 04:35 UTC50m
2026-07-03 ZKSWX - Jul 3, 02:10 UTCJul 3, 02:50 UTC40m
2026-07-02 ZKSWX - Jul 2, 22:05 UTCJul 2, 23:55 UTC1h 50m
2026-07-02 ZKSWX - Jul 2, 05:45 UTCJul 2, 06:45 UTC1h 0m
2026-07-02 ZKSWX AMZ → AMZ Jul 2, 03:50 UTCJul 2, 05:00 UTC1h 10m
2026-07-02 ZKSWX - Jul 2, 01:45 UTCJul 2, 02:50 UTC1h 5m
2026-07-02 ZKSWX - Jul 2, 00:40 UTCJul 2, 01:05 UTC25m
2026-07-01 ZKSWX - Jul 1, 05:45 UTCJul 1, 06:45 UTC1h 0m
2026-07-01 ZKSWX - Jul 1, 04:05 UTCJul 1, 05:05 UTC1h 0m
2026-07-01 ZKSWX AMZ → AMZ Jul 1, 02:25 UTCJul 1, 03:05 UTC40m
2026-06-30 ZKSWX - Jun 30, 23:40 UTCJul 1, 00:35 UTC55m
2026-06-30 ZKSWX - Jun 30, 21:40 UTCJun 30, 22:15 UTC35m
2026-06-30 ZKSWX - Jun 30, 06:05 UTCJun 30, 07:20 UTC1h 15m
2026-06-30 ZKSWX AMZ → AMZ Jun 30, 04:20 UTCJun 30, 05:15 UTC55m
2026-06-30 ZKSWX - Jun 30, 01:04 UTCJun 30, 02:50 UTC1h 46m
2026-06-29 ZKSWX - Jun 29, 23:19 UTCJun 30, 00:09 UTC50m
2026-06-29 ZKSWX - Jun 29, 21:50 UTCJun 29, 22:30 UTC40m
2026-06-29 ZKSWX - Jun 29, 03:05 UTCJun 29, 03:14 UTC10m
2026-06-29 ZKSWX - Jun 29, 02:25 UTCJun 29, 02:35 UTC10m
2026-06-29 ZKSWX - Jun 29, 01:05 UTCJun 29, 01:55 UTC50m
2026-06-28 ZKSWX - Jun 28, 22:59 UTCJun 28, 23:09 UTC10m
2026-06-27 ZKSWX AMZ → AMZ Jun 27, 01:24 UTCJun 27, 02:14 UTC50m
2026-06-26 ZKSWX - Jun 26, 23:39 UTCJun 27, 00:25 UTC45m
2026-06-26 ZKSWX - Jun 26, 21:35 UTCJun 26, 22:14 UTC40m
2026-06-23 ZKSWX - Jun 23, 04:09 UTCJun 23, 05:00 UTC50m
2026-06-22 ZKSWX AMZ → AMZ Jun 22, 01:35 UTCJun 22, 03:45 UTC2h 10m
2026-06-21 ZKSWX - Jun 21, 22:15 UTCJun 22, 00:20 UTC2h 5m
2026-06-20 ZKSWX - Jun 20, 01:39 UTCJun 20, 02:14 UTC35m
2026-06-19 ZKSWX - Jun 19, 04:25 UTCJun 19, 04:54 UTC30m
2026-06-16 ZKSWX AMZ → AMZ Jun 16, 05:59 UTCJun 16, 06:59 UTC1h 0m
2026-06-16 ZKSWX AMZ → AMZ Jun 16, 04:10 UTCJun 16, 04:50 UTC40m
2026-06-15 ZKSWX - Jun 15, 01:30 UTCJun 15, 03:15 UTC1h 45m
2026-06-11 ZKSWX - Jun 11, 06:05 UTCJun 11, 07:05 UTC1h 0m
2026-06-11 ZKSWX - Jun 11, 01:50 UTCJun 11, 02:40 UTC50m
2026-06-10 ZKSWX - Jun 10, 22:10 UTCJun 11, 00:30 UTC2h 20m

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

Mode-S C81919 frequently asked

What is Mode-S code C81919?
C81919 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-SWX.
Where is Mode-S C81919 registered?
Mode-S code C81919 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 C81919 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81919, octal 62014431, decimal 13,113,625.
What flights does C81919 operate?
Mode-S C81919 has broadcast 1 distinct callsign, including ZKSWX.