sensors Mode-S transponder
7C68B4
ICAO 24-bit transponder address · allocated to Australia
Currently assigned to VH-UYU · EMBRAER ERJ-190-100 · operated by ALLIANCE AIRLINES PTY LIMITED
- Hex
- 7C68B4
- Octal
- 37064264
- Decimal
- 8,153,268
- Country
- AU
- Tail
- VH-UYU
- Type
- E190
- Flights observed
- 288
- Distinct callsigns
- 20
- Country
- AU
- Last broadcast
- 1h ago
Last known position
Country allocation
The ICAO 24-bit address 7C68B4 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 20 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| QLK1943 | - | 11 | 2026-07-14 |
| QLK1984 | - | 10 | 2026-06-25 |
| QLK1983 | - | 10 | 2026-06-25 |
| QLK1944 | - | 9 | 2026-07-13 |
| QLK1803 | - | 8 | 2026-07-05 |
| QLK1955 | - | 7 | 2026-06-26 |
| QLK1956 | - | 6 | 2026-06-26 |
| QLK1804 | - | 6 | 2026-07-10 |
| QLK1988 | - | 5 | 2026-07-02 |
| QLK1987 | - | 5 | 2026-07-07 |
| QLK1918 | - | 5 | 2026-06-24 |
| QLK1917 | - | 5 | 2026-06-25 |
| QLK1848 | - | 5 | 2026-06-24 |
| QLK1846 | - | 5 | 2026-07-07 |
| QLK1827 | - | 5 | 2026-07-03 |
| QLK1822 | - | 5 | 2026-07-02 |
| QLK1993 | - | 4 | 2026-06-19 |
| QLK1990 | - | 4 | 2026-05-29 |
| QLK1972 | - | 4 | 2026-06-14 |
| QLK1950 | - | 4 | 2026-06-26 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-14 | QLK1943 | MEL → SYD | Jul 14, 01:20 UTC | Jul 14, 07:00 UTC | 5h 40m |
| 2026-07-13 | QLK1944 | SYD → MEL | Jul 13, 09:00 UTC | Jul 14, 00:05 UTC | 15h 5m |
| 2026-07-13 | QLK1943 | MEL → SYD | Jul 13, 01:45 UTC | Jul 13, 07:45 UTC | 6h 0m |
| 2026-07-12 | QLK1944 | SYD → MEL | Jul 12, 08:45 UTC | Jul 13, 00:01 UTC | 15h 15m |
| 2026-07-12 | QLK1943 | MEL → SYD | Jul 12, 01:25 UTC | Jul 12, 07:25 UTC | 6h 0m |
| 2026-07-11 | QLK1941 | - | Jul 11, 23:35 UTC | Jul 12, 00:15 UTC | 40m |
| 2026-07-11 | QLK1944 | SYD → MEL | Jul 11, 01:05 UTC | Jul 12, 00:15 UTC | 23h 10m |
| 2026-07-10 | QLK1943 | BNE → SYD | Jul 10, 06:10 UTC | Jul 10, 23:40 UTC | 17h 30m |
| 2026-07-10 | QLK1804 | ADL → BNE | Jul 10, 02:45 UTC | Jul 10, 04:55 UTC | 2h 10m |
| 2026-07-09 | QLK1795 | - | Jul 9, 23:15 UTC | Jul 10, 00:50 UTC | 1h 35m |
| 2026-07-09 | QLK1794 | - | Jul 9, 20:55 UTC | Jul 9, 22:15 UTC | 1h 20m |
| 2026-07-08 | QLK1799 | - | Jul 8, 09:35 UTC | Jul 8, 11:10 UTC | 1h 35m |
| 2026-07-08 | QLK1798 | - | Jul 8, 07:15 UTC | Jul 8, 08:35 UTC | 1h 20m |
| 2026-07-08 | QLK1909 | - | Jul 8, 01:35 UTC | Jul 8, 03:50 UTC | 2h 15m |
| 2026-07-07 | QLK1997 | - | Jul 7, 23:25 UTC | Jul 8, 00:40 UTC | 1h 15m |
| 2026-07-07 | QLK1996 | - | Jul 7, 20:35 UTC | Jul 7, 22:15 UTC | 1h 40m |
| 2026-07-07 | QLK1987 | - | Jul 7, 10:20 UTC | Jul 7, 11:25 UTC | 1h 5m |
| 2026-07-07 | QLK1846 | BNE → BNE | Jul 7, 06:35 UTC | Jul 7, 09:20 UTC | 2h 45m |
| 2026-07-07 | QLK1802 | ADL → BNE | Jul 7, 00:10 UTC | Jul 7, 02:10 UTC | 2h 0m |
| 2026-07-06 | QLK1856 | ADL → ADL | Jul 6, 04:55 UTC | Jul 6, 09:25 UTC | 4h 30m |
| 2026-07-05 | QLK1803 | BNE → ADL | Jul 5, 23:40 UTC | Jul 6, 02:10 UTC | 2h 30m |
| 2026-07-05 | QLK1890 | BNE → BNE | Jul 5, 10:25 UTC | Jul 5, 22:00 UTC | 11h 35m |
| 2026-07-05 | QLK1829 | MKY → BNE | Jul 5, 07:25 UTC | Jul 5, 08:35 UTC | 1h 10m |
| 2026-07-05 | QLK1828 | - | Jul 5, 05:15 UTC | Jul 5, 06:40 UTC | 1h 25m |
| 2026-07-04 | QLK1924 | BNE → BNE | Jul 4, 22:15 UTC | Jul 5, 04:10 UTC | 5h 55m |
| 2026-07-04 | QLK1825 | - | Jul 4, 03:20 UTC | Jul 4, 04:25 UTC | 1h 5m |
| 2026-07-04 | QLK1824 | - | Jul 4, 00:55 UTC | Jul 4, 02:15 UTC | 1h 20m |
| 2026-07-03 | QLK1986 | - | Jul 3, 09:45 UTC | Jul 3, 10:45 UTC | 1h 0m |
| 2026-07-03 | QLK1985 | - | Jul 3, 07:45 UTC | Jul 3, 08:55 UTC | 1h 10m |
| 2026-07-03 | QLK1827 | - | Jul 3, 05:20 UTC | Jul 3, 06:25 UTC | 1h 5m |
| 2026-07-03 | QLK1826 | - | Jul 3, 03:10 UTC | Jul 3, 04:35 UTC | 1h 25m |
| 2026-07-03 | QLK1823 | - | Jul 3, 00:40 UTC | Jul 3, 01:50 UTC | 1h 10m |
| 2026-07-02 | QLK1822 | - | Jul 2, 22:25 UTC | Jul 2, 23:45 UTC | 1h 20m |
| 2026-07-02 | QLK1988 | - | Jul 2, 20:10 UTC | Jul 2, 21:10 UTC | 1h 0m |
| 2026-07-02 | QLK1999 | - | Jul 2, 09:40 UTC | Jul 2, 10:55 UTC | 1h 15m |
| 2026-07-02 | QLK1998 | - | Jul 2, 06:25 UTC | Jul 2, 08:00 UTC | 1h 35m |
| 2026-07-02 | QLK1908 | - | Jul 2, 03:35 UTC | Jul 2, 05:10 UTC | 1h 35m |
| 2026-07-02 | QLK1791 | MEL → ADL | Jul 2, 00:15 UTC | Jul 2, 01:30 UTC | 1h 15m |
| 2026-07-01 | QLK1790 | ADL → MEL | Jul 1, 21:55 UTC | Jul 1, 22:55 UTC | 1h 0m |
| 2026-07-01 | QLK1811 | BNE → ADL | Jul 1, 09:00 UTC | Jul 1, 11:50 UTC | 2h 50m |
| 2026-07-01 | QLK1806 | ADL → BNE | Jul 1, 04:00 UTC | Jul 1, 06:00 UTC | 2h 0m |
| 2026-06-30 | QLK1803 | BNE → ADL | Jun 30, 23:15 UTC | Jul 1, 02:05 UTC | 2h 50m |
| 2026-06-30 | QLK1944 | SYD → BNE | Jun 30, 08:45 UTC | Jun 30, 21:40 UTC | 12h 55m |
| 2026-06-30 | QLK1943 | MEL → SYD | Jun 30, 01:35 UTC | Jun 30, 07:30 UTC | 5h 55m |
| 2026-06-29 | QLK1941 | - | Jun 29, 23:25 UTC | Jun 30, 00:00 UTC | 35m |
| 2026-06-29 | QLK1944 | - | Jun 29, 08:44 UTC | Jun 29, 10:55 UTC | 2h 10m |
| 2026-06-29 | QLK1943 | - | Jun 29, 05:50 UTC | Jun 29, 07:40 UTC | 1h 50m |
| 2026-06-29 | QLK1942 | - | Jun 29, 01:29 UTC | Jun 29, 02:00 UTC | 30m |
| 2026-06-28 | QLK1944 | SYD → MEL | Jun 28, 08:50 UTC | Jun 28, 23:50 UTC | 15h 0m |
| 2026-06-28 | QLK1943 | MEL → SYD | Jun 28, 01:15 UTC | Jun 28, 07:34 UTC | 6h 20m |
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-UYU page for operator, model, and routing details .