sensors Mode-S transponder
7C4921
ICAO 24-bit transponder address · allocated to Australia
Currently assigned to VH-OQB · AIRBUS A-380-800 · operated by QANTAS AIRWAYS LIMITED
- Hex
- 7C4921
- Octal
- 37044441
- Decimal
- 8,145,185
- Country
- AU
- Tail
- VH-OQB
- Type
- A388
- Flights observed
- 66
- Distinct callsigns
- 10
- Country
- AU
- Last broadcast
- 3h ago
Last known position
Country allocation
The ICAO 24-bit address 7C4921 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 10 distinct
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | QFA93 | MEL → LAX | May 30, 00:50 UTC | May 30, 02:45 UTC | 1h 55m |
| 2026-05-29 | QFA94 | LAX → MEL | May 29, 05:30 UTC | May 29, 20:25 UTC | 14h 55m |
| 2026-05-28 | QFA11 | SYD → LAX | May 28, 12:05 UTC | May 29, 01:15 UTC | 13h 10m |
| 2026-05-28 | QFA64 | JNB → SYD | May 28, 03:05 UTC | May 28, 04:45 UTC | 1h 40m |
| 2026-05-27 | QFA64 | JNB → SYD | May 27, 17:05 UTC | May 27, 17:20 UTC | 15m |
| 2026-05-27 | QFA63 | SYD → JNB | May 27, 00:00 UTC | May 27, 13:30 UTC | 13h 31m |
| 2026-05-26 | QFA12 | LAX → SYD | May 26, 06:49 UTC | May 26, 21:20 UTC | 14h 30m |
| 2026-05-25 | QFA11 | SYD → LAX | May 25, 08:20 UTC | May 25, 20:50 UTC | 12h 29m |
| 2026-05-24 | QFA2 | LHR → SIN | May 24, 18:00 UTC | May 24, 19:05 UTC | 1h 5m |
| 2026-05-23 | QFA2 | LHR → SIN | May 23, 20:30 UTC | May 24, 09:25 UTC | 12h 55m |
| 2026-05-22 | QFA1 | SYD → SIN | May 22, 16:15 UTC | May 23, 05:50 UTC | 13h 34m |
| 2026-05-22 | QFA1 | SYD → SIN | May 22, 05:05 UTC | May 22, 05:40 UTC | 35m |
| 2026-05-21 | QFA2 | LHR → SIN | May 21, 23:50 UTC | May 22, 00:35 UTC | 45m |
| 2026-05-20 | QFA2 | LHR → SIN | May 20, 20:10 UTC | May 21, 08:35 UTC | 12h 25m |
| 2026-05-19 | QFA1 | SYD → SIN | May 19, 16:10 UTC | May 20, 05:25 UTC | 13h 16m |
| 2026-05-19 | QFA1 | SYD → SIN | May 19, 13:10 UTC | May 19, 13:20 UTC | 10m |
| 2026-05-19 | QFA1 | SYD → SIN | May 19, 05:15 UTC | May 19, 05:50 UTC | 35m |
| 2026-05-18 | QFA2 | LHR → SIN | May 18, 18:10 UTC | May 18, 19:05 UTC | 54m |
| 2026-05-17 | QFA2 | LHR → SIN | May 17, 20:25 UTC | May 18, 09:20 UTC | 12h 55m |
| 2026-05-16 | QFA1 | SYD → SIN | May 16, 16:05 UTC | May 17, 05:35 UTC | 13h 30m |
| 2026-05-16 | QFA1 | SYD → SIN | May 16, 05:20 UTC | May 16, 05:56 UTC | 36m |
| 2026-05-15 | QFA12 | LAX → SYD | May 15, 07:15 UTC | May 15, 21:25 UTC | 14h 9m |
| 2026-05-13 | QFA11 | SYD → LAX | May 13, 08:10 UTC | May 13, 21:05 UTC | 12h 55m |
| 2026-05-12 | QFA8 | DFW → SYD | May 12, 04:40 UTC | May 12, 21:10 UTC | 16h 30m |
| 2026-05-11 | QFA7 | SYD → DFW | May 11, 04:15 UTC | May 11, 18:35 UTC | 14h 20m |
| 2026-05-10 | QFA8 | DFW → SYD | May 10, 04:15 UTC | May 10, 20:40 UTC | 16h 25m |
| 2026-05-09 | QFA7 | SYD → DFW | May 9, 03:00 UTC | May 9, 17:25 UTC | 14h 25m |
| 2026-05-08 | QFA12 | LAX → SYD | May 8, 07:24 UTC | May 8, 21:55 UTC | 14h 30m |
| 2026-05-07 | QFA11 | SYD → LAX | May 7, 09:25 UTC | May 7, 22:50 UTC | 13h 25m |
| 2026-05-07 | QFA64 | JNB → SYD | May 7, 03:25 UTC | May 7, 05:05 UTC | 1h 40m |
| 2026-05-06 | QFA64 | JNB → SYD | May 6, 17:30 UTC | May 6, 17:50 UTC | 19m |
| 2026-05-06 | QFA63 | SYD → JNB | May 6, 00:05 UTC | May 6, 14:30 UTC | 14h 25m |
| 2026-05-05 | QFA2 | LHR → SIN | May 5, 18:35 UTC | May 5, 19:15 UTC | 40m |
| 2026-05-04 | QFA2 | LHR → SIN | May 4, 20:15 UTC | May 5, 08:15 UTC | 12h 0m |
| 2026-05-03 | QFA1 | SYD → SIN | May 3, 16:05 UTC | May 4, 05:20 UTC | 13h 15m |
| 2026-05-03 | QFA1 | SYD → SIN | May 3, 12:50 UTC | May 3, 13:05 UTC | 15m |
| 2026-05-03 | QFA1 | SYD → SIN | May 3, 05:05 UTC | May 3, 06:00 UTC | 55m |
| 2026-05-02 | QFA8 | DFW → SYD | May 2, 04:20 UTC | May 2, 21:05 UTC | 16h 45m |
| 2026-05-01 | QFA7 | SYD → DFW | May 1, 02:40 UTC | May 1, 17:10 UTC | 14h 30m |
| 2026-04-30 | QFA8 | DFW → SYD | Apr 30, 04:40 UTC | Apr 30, 21:15 UTC | 16h 35m |
| 2026-04-29 | QFA7 | SYD → DFW | Apr 29, 02:45 UTC | Apr 29, 17:01 UTC | 14h 16m |
| 2026-04-28 | QFA12 | LAX → SYD | Apr 28, 08:50 UTC | Apr 28, 22:45 UTC | 13h 55m |
| 2026-04-26 | QFA11 | SYD → LAX | Apr 26, 10:45 UTC | Apr 26, 23:35 UTC | 12h 50m |
| 2026-04-25 | QFA64 | JNB → SYD | Apr 25, 18:05 UTC | Apr 26, 05:35 UTC | 11h 30m |
| 2026-04-25 | QFA63 | SYD → JNB | Apr 25, 00:25 UTC | Apr 25, 13:55 UTC | 13h 30m |
| 2026-04-24 | QFA12 | LAX → SYD | Apr 24, 07:05 UTC | Apr 24, 21:30 UTC | 14h 25m |
| 2026-04-23 | QFA11 | SYD → LAX | Apr 23, 08:45 UTC | Apr 23, 21:50 UTC | 13h 4m |
| 2026-04-22 | QFA64 | JNB → SYD | Apr 22, 17:30 UTC | Apr 23, 04:30 UTC | 11h 0m |
| 2026-04-22 | QFA63 | SYD → JNB | Apr 22, 00:15 UTC | Apr 22, 13:55 UTC | 13h 40m |
| 2026-04-21 | QFA2 | LHR → SIN | Apr 21, 15:31 UTC | Apr 21, 21:15 UTC | 5h 45m |
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-OQB page for operator, model, and routing details .