sensors Mode-S transponder
C81838
ICAO 24-bit transponder address · allocated to New Zealand
Currently assigned to ZK-KSD · JODEL D-11x/12x
- Hex
- C81838
- Octal
- 62014070
- Decimal
- 13,113,400
- Country
- NZ
- Tail
- ZK-KSD
- Type
- D11
- Flights observed
- 68
- Distinct callsigns
- 1
- Country
- NZ
- Last broadcast
- Jul 21, 04:40 UTC
Last known position
Country allocation
The ICAO 24-bit address C81838 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 |
|---|---|---|---|
| ZKKSD | - | 68 | 2026-07-21 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-21 | ZKKSD | - | Jul 21, 03:45 UTC | Jul 21, 04:40 UTC | 55m |
| 2026-07-20 | ZKKSD | - | Jul 20, 23:10 UTC | Jul 21, 00:10 UTC | 1h 0m |
| 2026-07-19 | ZKKSD | - | Jul 19, 02:20 UTC | Jul 19, 02:30 UTC | 10m |
| 2026-07-13 | ZKKSD | - | Jul 13, 00:30 UTC | Jul 13, 01:45 UTC | 1h 15m |
| 2026-07-01 | ZKKSD | - | Jul 1, 03:05 UTC | Jul 1, 04:00 UTC | 55m |
| 2026-06-30 | ZKKSD | - | Jun 30, 21:45 UTC | Jun 30, 22:45 UTC | 1h 0m |
| 2026-06-29 | ZKKSD | - | Jun 29, 02:54 UTC | Jun 29, 03:54 UTC | 1h 0m |
| 2026-06-28 | ZKKSD | - | Jun 28, 20:54 UTC | Jun 28, 22:15 UTC | 1h 20m |
| 2026-06-28 | ZKKSD | - | Jun 28, 03:14 UTC | Jun 28, 04:10 UTC | 55m |
| 2026-06-27 | ZKKSD | - | Jun 27, 20:49 UTC | Jun 27, 22:04 UTC | 1h 15m |
| 2026-06-27 | ZKKSD | - | Jun 27, 03:09 UTC | Jun 27, 04:59 UTC | 1h 50m |
| 2026-06-26 | ZKKSD | - | Jun 26, 23:04 UTC | Jun 27, 00:20 UTC | 1h 15m |
| 2026-06-23 | ZKKSD | - | Jun 23, 01:45 UTC | Jun 23, 03:04 UTC | 1h 20m |
| 2026-06-15 | ZKKSD | - | Jun 15, 02:50 UTC | Jun 15, 03:24 UTC | 35m |
| 2026-06-14 | ZKKSD | - | Jun 14, 23:54 UTC | Jun 15, 00:10 UTC | 15m |
| 2026-06-14 | ZKKSD | - | Jun 14, 22:30 UTC | Jun 14, 22:55 UTC | 25m |
| 2026-06-14 | ZKKSD | - | Jun 14, 02:20 UTC | Jun 14, 03:10 UTC | 50m |
| 2026-06-13 | ZKKSD | - | Jun 13, 01:00 UTC | Jun 13, 01:40 UTC | 40m |
| 2026-06-12 | ZKKSD | - | Jun 12, 23:40 UTC | Jun 13, 00:30 UTC | 50m |
| 2026-06-11 | ZKKSD | - | Jun 11, 02:15 UTC | Jun 11, 02:30 UTC | 15m |
| 2026-06-11 | ZKKSD | - | Jun 11, 00:55 UTC | Jun 11, 01:15 UTC | 20m |
| 2026-06-10 | ZKKSD | - | Jun 10, 22:50 UTC | Jun 11, 00:05 UTC | 1h 15m |
| 2026-06-10 | ZKKSD | - | Jun 10, 21:25 UTC | Jun 10, 22:05 UTC | 40m |
| 2026-06-10 | ZKKSD | - | Jun 10, 01:45 UTC | Jun 10, 02:10 UTC | 25m |
| 2026-06-09 | ZKKSD | - | Jun 9, 23:30 UTC | Jun 10, 00:10 UTC | 40m |
| 2026-06-09 | ZKKSD | - | Jun 9, 21:25 UTC | Jun 9, 22:00 UTC | 35m |
| 2026-06-03 | ZKKSD | - | Jun 3, 21:55 UTC | Jun 3, 23:50 UTC | 1h 55m |
| 2026-05-26 | ZKKSD | - | May 26, 00:54 UTC | May 26, 01:20 UTC | 25m |
| 2026-05-25 | ZKKSD | - | May 25, 21:04 UTC | May 25, 21:35 UTC | 30m |
| 2026-05-25 | ZKKSD | - | May 25, 03:15 UTC | May 25, 03:40 UTC | 25m |
| 2026-05-18 | ZKKSD | - | May 18, 02:40 UTC | May 18, 03:10 UTC | 30m |
| 2026-05-18 | ZKKSD | - | May 18, 01:15 UTC | May 18, 01:25 UTC | 10m |
| 2026-05-17 | ZKKSD | - | May 17, 21:05 UTC | May 17, 21:35 UTC | 30m |
| 2026-05-13 | ZKKSD | - | May 13, 22:40 UTC | May 14, 01:20 UTC | 2h 40m |
| 2026-05-13 | ZKKSD | - | May 13, 20:00 UTC | May 13, 21:05 UTC | 1h 5m |
| 2026-05-13 | ZKKSD | - | May 13, 00:55 UTC | May 13, 03:25 UTC | 2h 30m |
| 2026-05-12 | ZKKSD | - | May 12, 22:50 UTC | May 12, 23:55 UTC | 1h 5m |
| 2026-05-12 | ZKKSD | - | May 12, 20:20 UTC | May 12, 21:01 UTC | 40m |
| 2026-05-12 | ZKKSD | - | May 12, 03:40 UTC | May 12, 03:50 UTC | 10m |
| 2026-05-11 | ZKKSD | - | May 11, 03:40 UTC | May 11, 04:30 UTC | 50m |
| 2026-05-11 | ZKKSD | - | May 11, 02:15 UTC | May 11, 03:05 UTC | 50m |
| 2026-05-10 | ZKKSD | - | May 10, 23:19 UTC | May 11, 00:54 UTC | 1h 35m |
| 2026-05-10 | ZKKSD | - | May 10, 20:54 UTC | May 10, 21:30 UTC | 35m |
| 2026-05-06 | ZKKSD | - | May 6, 23:30 UTC | May 7, 00:10 UTC | 40m |
| 2026-05-06 | ZKKSD | - | May 6, 20:45 UTC | May 6, 21:35 UTC | 50m |
| 2026-05-05 | ZKKSD | - | May 5, 03:50 UTC | May 5, 04:45 UTC | 55m |
| 2026-05-05 | ZKKSD | - | May 5, 02:01 UTC | May 5, 03:15 UTC | 1h 15m |
| 2026-05-04 | ZKKSD | - | May 4, 23:25 UTC | May 5, 00:00 UTC | 35m |
| 2026-05-04 | ZKKSD | - | May 4, 20:35 UTC | May 4, 21:35 UTC | 1h 0m |
| 2026-04-30 | ZKKSD | - | Apr 30, 04:00 UTC | Apr 30, 04:50 UTC | 50m |
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-KSD page for operator, model, and routing details .