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sensors Mode-S transponder

C820A7

ICAO 24-bit transponder address · allocated to New Zealand

Currently assigned to ZK-ZDM · CESSNA 172 Skyhawk

Hex
C820A7
Octal
62020247
Decimal
13,115,559
Country
NZ
Tail
ZK-ZDM
Type
C172
No current signal · last broadcast Jul 24, 03:20 UTC
Flights observed
34
Distinct callsigns
1
Country
NZ
Last broadcast
Jul 24, 03:20 UTC

Last known position

Most recent position reported by Mode-S C820A7.

Country allocation

The ICAO 24-bit address C820A7 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
ZKZDM - 34 2026-07-24

Recent flights last 34

DateFlightRouteTakeoffLandingDuration
2026-07-24 ZKZDM NPE → NPE Jul 24, 02:35 UTCJul 24, 03:20 UTC45m
2026-07-23 ZKZDM NPE → NPE Jul 23, 21:25 UTCJul 23, 22:05 UTC40m
2026-07-23 ZKZDM - Jul 23, 04:10 UTCJul 23, 05:05 UTC55m
2026-07-22 ZKZDM - Jul 22, 05:00 UTCJul 22, 05:10 UTC10m
2026-07-22 ZKZDM - Jul 22, 02:15 UTCJul 22, 04:05 UTC1h 50m
2026-07-22 ZKZDM - Jul 22, 00:55 UTCJul 22, 01:20 UTC25m
2026-07-03 ZKZDM - Jul 3, 02:05 UTCJul 3, 02:40 UTC35m
2026-06-18 ZKZDM - Jun 18, 01:35 UTCJun 18, 02:40 UTC1h 5m
2026-05-30 ZKZDM - May 30, 02:06 UTCMay 30, 02:40 UTC34m
2026-05-14 ZKZDM - May 14, 05:00 UTCMay 14, 05:15 UTC15m
2026-05-14 ZKZDM - May 14, 02:55 UTCMay 14, 03:30 UTC35m
2026-05-11 ZKZDM - May 11, 21:10 UTCMay 11, 21:35 UTC25m
2026-05-11 ZKZDM NPE → NPE May 11, 03:50 UTCMay 11, 04:40 UTC50m
2026-05-08 ZKZDM NPE → NPE May 8, 22:55 UTCMay 8, 23:40 UTC45m
2026-05-07 ZKZDM - May 7, 01:35 UTCMay 7, 02:15 UTC40m
2026-05-04 ZKZDM NPE → NPE May 4, 04:24 UTCMay 4, 05:10 UTC45m
2026-05-04 ZKZDM NPE → NPE May 4, 02:25 UTCMay 4, 03:24 UTC1h 0m
2026-05-01 ZKZDM NPE → NPE May 1, 03:00 UTCMay 1, 03:50 UTC50m
2026-05-01 ZKZDM - May 1, 00:25 UTCMay 1, 01:20 UTC55m
2026-04-29 ZKZDM - Apr 29, 23:25 UTCApr 30, 00:20 UTC55m
2026-04-29 ZKZDM NPE → NPE Apr 29, 21:35 UTCApr 29, 22:20 UTC45m
2026-04-29 ZKZDM - Apr 29, 04:20 UTCApr 29, 05:00 UTC40m
2026-04-29 ZKZDM NPE → NPE Apr 29, 02:15 UTCApr 29, 03:00 UTC45m
2026-04-28 ZKZDM NPE → NPE Apr 28, 20:40 UTCApr 28, 21:35 UTC55m
2026-04-28 ZKZDM - Apr 28, 03:20 UTCApr 28, 03:45 UTC25m
2026-04-28 ZKZDM NPE → NPE Apr 28, 01:20 UTCApr 28, 02:05 UTC45m
2026-04-27 ZKZDM - Apr 27, 22:15 UTCApr 27, 23:10 UTC55m
2026-04-24 ZKZDM NPE → NPE Apr 24, 03:55 UTCApr 24, 04:50 UTC55m
2026-04-24 ZKZDM - Apr 24, 02:05 UTCApr 24, 02:45 UTC40m
2026-04-22 ZKZDM NPE → NPE Apr 22, 21:00 UTCApr 22, 22:05 UTC1h 5m
2026-04-16 ZKZDM - Apr 16, 21:14 UTCApr 16, 22:05 UTC50m
2026-04-15 ZKZDM - Apr 15, 03:45 UTCApr 15, 04:35 UTC50m
2026-04-15 ZKZDM NPE → NPE Apr 15, 01:55 UTCApr 15, 02:15 UTC20m
2026-04-13 ZKZDM - Apr 13, 23:30 UTCApr 13, 23:40 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-ZDM page for operator, model, and routing details .

Mode-S C820A7 frequently asked

What is Mode-S code C820A7?
C820A7 is an ICAO 24-bit transponder address. Allocated to New Zealand. Assigned to ZK-ZDM.
Where is Mode-S C820A7 registered?
Mode-S code C820A7 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 C820A7 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 03:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C820A7, octal 62020247, decimal 13,115,559.
What flights does C820A7 operate?
Mode-S C820A7 has broadcast 1 distinct callsign, including ZKZDM.