sensors Mode-S transponder
7C7658
ICAO 24-bit transponder address · allocated to Australia
Currently assigned to VH-XNU · BOEING 737-300 · operated by NAURU AIR CORPORATION
- Hex
- 7C7658
- Octal
- 37073130
- Decimal
- 8,156,760
- Country
- AU
- Tail
- VH-XNU
- Type
- B733
- Flights observed
- 36
- Distinct callsigns
- 11
- Country
- AU
- Last broadcast
- 3d ago
Last known position
Country allocation
The ICAO 24-bit address 7C7658 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 11 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| RON42 | Nauru Airlines | 9 | 2026-07-21 |
| RON41 | Nauru Airlines | 7 | 2026-07-23 |
| SKP961 | Skytrans Airlines | 5 | 2026-06-02 |
| RON2 | - | 5 | 2026-07-13 |
| RON1 | - | 3 | 2026-07-10 |
| SKP962 | Skytrans Airlines | 2 | 2026-05-27 |
| SOL726 | Solomon Airlines | 1 | 2026-05-13 |
| RON92 | Nauru Airlines | 1 | 2026-06-16 |
| RON91 | Nauru Airlines | 1 | 2026-06-03 |
| RON801 | Nauru Airlines | 1 | 2026-04-15 |
| RON800 | - | 1 | 2026-07-05 |
Recent flights last 36
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-23 | RON41 | PNI → ROR | Jul 23, 13:05 UTC | Jul 23, 13:35 UTC | 30m |
| 2026-07-21 | RON42 | INU → BNE | Jul 21, 12:30 UTC | Jul 21, 13:20 UTC | 50m |
| 2026-07-13 | RON2 | - | Jul 13, 03:01 UTC | Jul 13, 03:30 UTC | 30m |
| 2026-07-10 | RON1 | - | Jul 10, 07:35 UTC | Jul 10, 08:15 UTC | 40m |
| 2026-07-08 | RON2 | - | Jul 8, 23:25 UTC | Jul 9, 00:00 UTC | 35m |
| 2026-07-05 | RON800 | BNE → BNE | Jul 5, 21:15 UTC | Jul 5, 22:30 UTC | 1h 15m |
| 2026-06-21 | RON42 | - | Jun 21, 19:50 UTC | Jun 22, 13:10 UTC | 17h 20m |
| 2026-06-19 | RON41 | PNI → ROR | Jun 19, 09:49 UTC | Jun 19, 10:09 UTC | 20m |
| 2026-06-18 | RON41 | PNI → ROR | Jun 18, 12:10 UTC | Jun 19, 10:09 UTC | 21h 59m |
| 2026-06-16 | RON92 | BNE → INU | Jun 16, 23:20 UTC | Jun 17, 09:10 UTC | 9h 50m |
| 2026-06-15 | RON42 | INU → BNE | Jun 15, 12:55 UTC | Jun 15, 13:40 UTC | 45m |
| 2026-06-14 | RON42 | INU → BNE | Jun 14, 19:50 UTC | Jun 14, 20:05 UTC | 15m |
| 2026-06-11 | RON41 | PNI → ROR | Jun 11, 12:25 UTC | Jun 12, 04:25 UTC | 16h 1m |
| 2026-06-08 | RON42 | INU → BNE | Jun 8, 12:10 UTC | Jun 8, 12:55 UTC | 45m |
| 2026-06-07 | RON42 | INU → BNE | Jun 7, 19:55 UTC | Jun 7, 20:10 UTC | 15m |
| 2026-06-04 | RON41 | PNI → ROR | Jun 4, 14:20 UTC | Jun 5, 09:00 UTC | 18h 40m |
| 2026-06-03 | RON91 | INU → BNE | Jun 3, 13:30 UTC | Jun 3, 23:25 UTC | 9h 55m |
| 2026-06-02 | SKP961 | BNE → ASP | Jun 2, 19:30 UTC | Jun 3, 10:30 UTC | 15h 0m |
| 2026-05-31 | RON42 | INU → BNE | May 31, 19:40 UTC | Jun 1, 13:00 UTC | 17h 20m |
| 2026-05-28 | RON41 | PNI → ROR | May 28, 12:35 UTC | May 29, 05:25 UTC | 16h 50m |
| 2026-05-27 | SKP962 | KTA → BNE | May 27, 09:55 UTC | May 27, 10:25 UTC | 30m |
| 2026-05-26 | SKP961 | BNE → ASP | May 26, 19:45 UTC | May 26, 20:15 UTC | 30m |
| 2026-05-25 | RON42 | INU → BNE | May 25, 13:00 UTC | May 25, 13:40 UTC | 40m |
| 2026-05-24 | RON42 | INU → BNE | May 24, 19:55 UTC | May 24, 20:10 UTC | 15m |
| 2026-05-21 | RON41 | PNI → ROR | May 21, 12:40 UTC | May 22, 04:45 UTC | 16h 5m |
| 2026-05-20 | SKP962 | KTA → BNE | May 20, 09:15 UTC | May 20, 09:45 UTC | 30m |
| 2026-05-19 | SKP961 | BNE → ASP | May 19, 19:25 UTC | May 19, 19:50 UTC | 25m |
| 2026-05-13 | SOL726 | SON → VLI | May 13, 23:25 UTC | May 14, 06:20 UTC | 6h 55m |
| 2026-05-12 | SKP961 | BNE → ASP | May 12, 19:20 UTC | May 13, 10:00 UTC | 14h 40m |
| 2026-05-05 | SKP961 | BNE → ASP | May 5, 20:30 UTC | May 6, 11:30 UTC | 15h 0m |
| 2026-05-01 | RON1 | - | May 1, 06:40 UTC | May 1, 07:25 UTC | 45m |
| 2026-04-27 | RON2 | - | Apr 27, 03:15 UTC | Apr 27, 03:50 UTC | 35m |
| 2026-04-24 | RON1 | - | Apr 24, 06:20 UTC | Apr 24, 06:50 UTC | 30m |
| 2026-04-20 | RON2 | - | Apr 20, 03:10 UTC | Apr 20, 03:45 UTC | 35m |
| 2026-04-15 | RON801 | BNE → BNE | Apr 15, 23:35 UTC | Apr 16, 00:15 UTC | 40m |
| 2026-04-13 | RON2 | - | Apr 13, 03:10 UTC | Apr 13, 03:40 UTC | 30m |
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-XNU page for operator, model, and routing details .