sensors Mode-S transponder
7C4D34
ICAO 24-bit transponder address · allocated to Australia
Currently assigned to VH-PJA · CESSNA 172 Skyhawk · operated by CANBERRA AERO CLUB
- Hex
- 7C4D34
- Octal
- 37046464
- Decimal
- 8,146,228
- Country
- AU
- Tail
- VH-PJA
- Type
- C172
- Flights observed
- 61
- Distinct callsigns
- 1
- Country
- AU
- Last broadcast
- 24d ago
Last known position
Country allocation
The ICAO 24-bit address 7C4D34 falls within the block assigned to Australia (AU) by ICAO Annex 10, Volume III. Every aircraft registered in Australia 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 |
|---|---|---|---|
| PJA | - | 61 | 2026-06-24 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-24 | PJA | - | Jun 24, 02:34 UTC | Jun 24, 03:19 UTC | 45m |
| 2026-06-23 | PJA | - | Jun 23, 04:09 UTC | Jun 23, 04:39 UTC | 30m |
| 2026-06-22 | PJA | - | Jun 22, 02:40 UTC | Jun 22, 03:10 UTC | 30m |
| 2026-06-21 | PJA | - | Jun 21, 01:55 UTC | Jun 21, 02:10 UTC | 15m |
| 2026-06-16 | PJA | - | Jun 16, 02:34 UTC | Jun 16, 04:39 UTC | 2h 5m |
| 2026-06-15 | PJA | - | Jun 15, 23:35 UTC | Jun 15, 23:54 UTC | 20m |
| 2026-06-15 | PJA | - | Jun 15, 05:04 UTC | Jun 15, 05:30 UTC | 25m |
| 2026-06-14 | PJA | - | Jun 14, 05:15 UTC | Jun 14, 05:25 UTC | 10m |
| 2026-06-14 | PJA | - | Jun 14, 04:25 UTC | Jun 14, 04:40 UTC | 15m |
| 2026-06-12 | PJA | - | Jun 12, 04:30 UTC | Jun 12, 04:45 UTC | 15m |
| 2026-06-11 | PJA | CBR → CBR | Jun 11, 06:40 UTC | Jun 11, 06:50 UTC | 10m |
| 2026-06-09 | PJA | - | Jun 9, 06:30 UTC | Jun 9, 07:05 UTC | 35m |
| 2026-06-07 | PJA | - | Jun 7, 05:40 UTC | Jun 7, 05:50 UTC | 10m |
| 2026-06-07 | PJA | - | Jun 7, 03:55 UTC | Jun 7, 04:20 UTC | 25m |
| 2026-06-06 | PJA | - | Jun 6, 05:50 UTC | Jun 6, 06:15 UTC | 25m |
| 2026-06-06 | PJA | - | Jun 6, 04:50 UTC | Jun 6, 05:00 UTC | 10m |
| 2026-06-06 | PJA | - | Jun 6, 04:00 UTC | Jun 6, 04:15 UTC | 15m |
| 2026-06-05 | PJA | - | Jun 5, 01:10 UTC | Jun 5, 02:05 UTC | 55m |
| 2026-06-01 | PJA | - | Jun 1, 06:05 UTC | Jun 1, 06:15 UTC | 10m |
| 2026-06-01 | PJA | - | Jun 1, 03:55 UTC | Jun 1, 04:40 UTC | 45m |
| 2026-06-01 | PJA | - | Jun 1, 01:50 UTC | Jun 1, 02:40 UTC | 50m |
| 2026-05-29 | PJA | CBR → CBR | May 29, 23:55 UTC | May 30, 00:30 UTC | 35m |
| 2026-05-29 | PJA | - | May 29, 04:00 UTC | May 29, 04:15 UTC | 15m |
| 2026-05-25 | PJA | - | May 25, 04:20 UTC | May 25, 04:30 UTC | 10m |
| 2026-05-23 | PJA | - | May 23, 00:45 UTC | May 23, 01:15 UTC | 30m |
| 2026-05-21 | PJA | - | May 21, 04:45 UTC | May 21, 05:05 UTC | 20m |
| 2026-05-21 | PJA | - | May 21, 00:10 UTC | May 21, 00:30 UTC | 20m |
| 2026-05-20 | PJA | - | May 20, 00:05 UTC | May 20, 00:25 UTC | 20m |
| 2026-05-17 | PJA | - | May 17, 06:40 UTC | May 17, 07:00 UTC | 20m |
| 2026-05-17 | PJA | - | May 17, 03:50 UTC | May 17, 04:10 UTC | 20m |
| 2026-05-17 | PJA | - | May 17, 02:00 UTC | May 17, 02:15 UTC | 15m |
| 2026-05-15 | PJA | - | May 15, 04:40 UTC | May 15, 05:55 UTC | 1h 15m |
| 2026-05-14 | PJA | - | May 14, 05:45 UTC | May 14, 06:00 UTC | 15m |
| 2026-05-14 | PJA | - | May 14, 02:40 UTC | May 14, 03:10 UTC | 30m |
| 2026-05-14 | PJA | - | May 14, 00:05 UTC | May 14, 00:45 UTC | 40m |
| 2026-05-12 | PJA | - | May 12, 02:45 UTC | May 12, 03:00 UTC | 15m |
| 2026-05-11 | PJA | - | May 11, 06:10 UTC | May 11, 06:25 UTC | 15m |
| 2026-05-11 | PJA | - | May 11, 03:50 UTC | May 11, 04:10 UTC | 20m |
| 2026-05-11 | PJA | - | May 11, 00:05 UTC | May 11, 00:15 UTC | 10m |
| 2026-05-10 | PJA | - | May 10, 03:14 UTC | May 10, 03:50 UTC | 35m |
| 2026-05-10 | PJA | - | May 10, 01:04 UTC | May 10, 01:14 UTC | 10m |
| 2026-05-09 | PJA | - | May 9, 03:35 UTC | May 9, 04:00 UTC | 25m |
| 2026-05-09 | PJA | - | May 9, 02:05 UTC | May 9, 02:30 UTC | 25m |
| 2026-05-06 | PJA | - | May 6, 05:45 UTC | May 6, 06:20 UTC | 35m |
| 2026-05-06 | PJA | - | May 6, 01:10 UTC | May 6, 02:55 UTC | 1h 45m |
| 2026-05-05 | PJA | - | May 5, 06:00 UTC | May 5, 06:15 UTC | 15m |
| 2026-05-02 | PJA | - | May 2, 03:05 UTC | May 2, 05:00 UTC | 1h 55m |
| 2026-04-27 | PJA | - | Apr 27, 04:50 UTC | Apr 27, 05:25 UTC | 35m |
| 2026-04-27 | PJA | - | Apr 27, 01:55 UTC | Apr 27, 02:35 UTC | 40m |
| 2026-04-26 | PJA | - | Apr 26, 06:10 UTC | Apr 26, 06:20 UTC | 10m |
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 VH-PJA page for operator, model, and routing details .