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sensors Mode-S transponder

C81456

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-TWR · PIPER PA-38 Tomahawk

Hex
C81456
Octal
62012126
Decimal
13,112,406
Country
NZ
Tail
ZK-TWR
Type
PA38
Broadcasting now · callsign ZKTWR · 500 ft
Flights observed
188
Distinct callsigns
1
Country
NZ
Last broadcast
Jul 26, 04:40 UTC

Current position

C81456 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address C81456 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
ZKTWR - 188 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ZKTWR - Jul 26, 04:10 UTCJul 26, 04:40 UTC30m
2026-07-26 ZKTWR - Jul 26, 01:20 UTCJul 26, 02:00 UTC40m
2026-07-25 ZKTWR - Jul 25, 21:40 UTCJul 25, 22:10 UTC30m
2026-07-23 ZKTWR - Jul 23, 04:25 UTCJul 23, 04:40 UTC15m
2026-07-21 ZKTWR - Jul 21, 00:40 UTCJul 21, 01:00 UTC20m
2026-07-20 ZKTWR - Jul 20, 23:15 UTCJul 20, 23:40 UTC25m
2026-07-20 ZKTWR - Jul 20, 03:50 UTCJul 20, 04:25 UTC35m
2026-07-18 ZKTWR WLG → WLG Jul 18, 21:25 UTCJul 18, 22:30 UTC1h 5m
2026-07-18 ZKTWR WLG → WLG Jul 18, 04:30 UTCJul 18, 05:15 UTC45m
2026-07-18 ZKTWR - Jul 18, 02:55 UTCJul 18, 03:25 UTC30m
2026-07-18 ZKTWR WLG → WLG Jul 18, 01:20 UTCJul 18, 02:14 UTC55m
2026-07-17 ZKTWR - Jul 17, 23:30 UTCJul 18, 00:19 UTC50m
2026-07-17 ZKTWR - Jul 17, 21:55 UTCJul 17, 22:20 UTC25m
2026-07-17 ZKTWR WLG → WLG Jul 17, 04:25 UTCJul 17, 04:54 UTC30m
2026-07-17 ZKTWR WLG → WLG Jul 17, 02:34 UTCJul 17, 03:34 UTC1h 0m
2026-07-16 ZKTWR - Jul 16, 22:00 UTCJul 16, 22:35 UTC35m
2026-07-16 ZKTWR WLG → WLG Jul 16, 04:05 UTCJul 16, 05:10 UTC1h 5m
2026-07-16 ZKTWR - Jul 16, 02:20 UTCJul 16, 02:35 UTC15m
2026-07-16 ZKTWR - Jul 16, 01:00 UTCJul 16, 01:35 UTC35m
2026-07-12 ZKTWR - Jul 12, 02:55 UTCJul 12, 03:45 UTC50m
2026-07-12 ZKTWR - Jul 12, 01:05 UTCJul 12, 01:45 UTC40m
2026-07-11 ZKTWR WLG → WLG Jul 11, 23:30 UTCJul 12, 00:01 UTC30m
2026-07-11 ZKTWR - Jul 11, 21:05 UTCJul 11, 22:01 UTC55m
2026-07-11 ZKTWR - Jul 11, 03:15 UTCJul 11, 03:45 UTC30m
2026-07-10 ZKTWR - Jul 10, 21:35 UTCJul 10, 22:05 UTC30m
2026-07-01 ZKTWR WLG → WLG Jul 1, 04:45 UTCJul 1, 05:15 UTC30m
2026-07-01 ZKTWR WLG → WLG Jul 1, 01:35 UTCJul 1, 02:25 UTC50m
2026-06-30 ZKTWR - Jun 30, 23:55 UTCJul 1, 00:10 UTC15m
2026-06-30 ZKTWR WLG → WLG Jun 30, 21:25 UTCJun 30, 22:35 UTC1h 10m
2026-06-30 ZKTWR - Jun 30, 03:50 UTCJun 30, 04:50 UTC1h 0m
2026-06-30 ZKTWR - Jun 30, 01:30 UTCJun 30, 02:25 UTC55m
2026-06-29 ZKTWR WLG → WLG Jun 29, 23:54 UTCJun 30, 00:25 UTC30m
2026-06-29 ZKTWR WLG → WLG Jun 29, 22:00 UTCJun 29, 22:30 UTC30m
2026-06-29 ZKTWR - Jun 29, 03:39 UTCJun 29, 03:49 UTC10m
2026-06-29 ZKTWR - Jun 29, 01:39 UTCJun 29, 01:50 UTC10m
2026-06-28 ZKTWR - Jun 28, 05:04 UTCJun 28, 05:15 UTC10m
2026-06-28 ZKTWR WLG → WLG Jun 28, 03:09 UTCJun 28, 03:35 UTC25m
2026-06-24 ZKTWR WLG → WLG Jun 24, 03:10 UTCJun 24, 03:44 UTC35m
2026-06-24 ZKTWR WLG → WLG Jun 24, 01:19 UTCJun 24, 02:05 UTC45m
2026-06-23 ZKTWR WLG → WLG Jun 23, 23:19 UTCJun 24, 00:34 UTC1h 15m
2026-06-23 ZKTWR - Jun 23, 21:45 UTCJun 23, 22:15 UTC30m
2026-06-23 ZKTWR - Jun 23, 04:29 UTCJun 23, 04:50 UTC20m
2026-06-23 ZKTWR - Jun 23, 03:00 UTCJun 23, 03:29 UTC30m
2026-06-23 ZKTWR - Jun 23, 01:25 UTCJun 23, 01:59 UTC35m
2026-06-22 ZKTWR WLG → WLG Jun 22, 23:24 UTCJun 22, 23:55 UTC30m
2026-06-22 ZKTWR WLG → WLG Jun 22, 21:45 UTCJun 22, 22:30 UTC45m
2026-06-22 ZKTWR WLG → WLG Jun 22, 03:24 UTCJun 22, 03:50 UTC25m
2026-06-22 ZKTWR WLG → WLG Jun 22, 01:05 UTCJun 22, 01:44 UTC40m
2026-06-21 ZKTWR - Jun 21, 23:24 UTCJun 22, 00:04 UTC40m
2026-06-21 ZKTWR - Jun 21, 21:24 UTCJun 21, 22:20 UTC55m

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

Mode-S C81456 frequently asked

What is Mode-S code C81456?
C81456 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-TWR.
Where is Mode-S C81456 registered?
Mode-S code C81456 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 C81456 broadcasting right now?
Yes. Mode-S C81456 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C81456, octal 62012126, decimal 13,112,406.
What flights does C81456 operate?
Mode-S C81456 has broadcast 1 distinct callsign, including ZKTWR.