Apparatus

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sensors Mode-S transponder

7C78AF

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-X4H · AIRBUS A220-300

Hex
7C78AF
Octal
37074257
Decimal
8,157,359
Country
AU
Tail
VH-X4H
Type
BCS3
Transponder active on ground
Flights observed
379
Distinct callsigns
20
Country
AU
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 7C78AF.

Country allocation

The ICAO 24-bit address 7C78AF 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
QLK1534 - 12 2026-07-12
QLK1577 - 11 2026-07-13
QLK282 - 10 2026-07-08
QLK1576 - 10 2026-07-13
QLK1575 - 10 2026-06-21
QLK1578 - 9 2026-07-12
QLK1574 - 9 2026-06-21
QLK281 - 8 2026-07-07
QLK1581 - 8 2026-07-13
QLK1580 - 8 2026-07-13
QLK1579 - 8 2026-07-12
QLK1533 - 8 2026-05-20
QLK1532 - 8 2026-05-25
QLK1515 - 8 2026-07-13
QLK1514 - 8 2026-07-13
QLK1508 - 8 2026-05-25
QLK1296 - 8 2026-06-19
QLK1572 - 7 2026-06-18
QLK1550 - 7 2026-07-08
QLK1519 - 7 2026-06-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 QLK1505 - Jul 14, 04:35 UTCJul 14, 07:45 UTC3h 10m
2026-07-13 QLK1504 SYD → SYD Jul 13, 23:05 UTCJul 14, 03:20 UTC4h 15m
2026-07-13 QLK1514 MEL → SYD Jul 13, 20:10 UTCJul 13, 21:15 UTC1h 5m
2026-07-13 QLK1515 SYD → MEL Jul 13, 10:40 UTCJul 13, 11:55 UTC1h 15m
2026-07-13 QLK1581 MCY → SYD Jul 13, 07:35 UTCJul 13, 08:55 UTC1h 20m
2026-07-13 QLK1580 - Jul 13, 05:20 UTCJul 13, 06:40 UTC1h 20m
2026-07-13 QLK1577 - Jul 13, 02:40 UTCJul 13, 04:05 UTC1h 25m
2026-07-13 QLK1576 - Jul 13, 00:15 UTCJul 13, 01:30 UTC1h 15m
2026-07-12 QLK1579 - Jul 12, 21:05 UTCJul 12, 22:35 UTC1h 30m
2026-07-12 QLK1578 - Jul 12, 10:10 UTCJul 12, 11:25 UTC1h 15m
2026-07-12 QLK1534 SYD → SYD Jul 12, 03:25 UTCJul 12, 07:10 UTC3h 45m
2026-07-10 QLK1506 - Jul 10, 04:20 UTCJul 10, 09:05 UTC4h 45m
2026-07-09 QLK1504 - Jul 9, 23:05 UTCJul 10, 03:10 UTC4h 5m
2026-07-09 QLK1514 MEL → SYD Jul 9, 20:15 UTCJul 9, 21:25 UTC1h 10m
2026-07-09 QLK1259 BNE → MEL Jul 9, 10:55 UTCJul 9, 13:00 UTC2h 5m
2026-07-09 QLK1554 BNE → BNE Jul 9, 05:00 UTCJul 9, 09:20 UTC4h 20m
2026-07-08 QLK1550 - Jul 8, 23:30 UTCJul 9, 03:45 UTC4h 15m
2026-07-08 QLK282 - Jul 8, 04:20 UTCJul 8, 08:00 UTC3h 40m
2026-07-08 QLK282 - Jul 8, 02:45 UTCJul 8, 03:00 UTC15m
2026-07-07 QLK281 - Jul 7, 23:50 UTCJul 8, 00:35 UTC45m
2026-07-07 QLK1266 - Jul 7, 12:50 UTCJul 7, 14:40 UTC1h 50m
2026-07-07 QLK1267 BNE → MEL Jul 7, 09:40 UTCJul 7, 11:50 UTC2h 10m
2026-07-07 QLK1254 - Jul 7, 06:40 UTCJul 7, 08:35 UTC1h 55m
2026-07-07 QLK1254 - Jul 7, 03:50 UTCJul 7, 04:55 UTC1h 5m
2026-07-06 QLK1253 - Jul 6, 22:40 UTCJul 7, 02:30 UTC3h 50m
2026-07-06 QLK1272 MEL → BNE Jul 6, 07:15 UTCJul 6, 09:10 UTC1h 55m
2026-07-06 QLK1299 - Jul 6, 03:05 UTCJul 6, 04:45 UTC1h 40m
2026-07-06 QLK1298 - Jul 6, 00:25 UTCJul 6, 01:55 UTC1h 30m
2026-07-05 QLK1521 - Jul 5, 22:05 UTCJul 5, 22:55 UTC50m
2026-07-05 QLK1518 - Jul 5, 20:20 UTCJul 5, 21:10 UTC50m
2026-07-05 QLK1515 - Jul 5, 10:15 UTCJul 5, 11:25 UTC1h 10m
2026-07-05 QLK1581 - Jul 5, 07:25 UTCJul 5, 08:50 UTC1h 25m
2026-07-05 QLK1580 - Jul 5, 05:10 UTCJul 5, 06:30 UTC1h 20m
2026-07-05 QLK1577 MCY → SYD Jul 5, 02:30 UTCJul 5, 03:50 UTC1h 20m
2026-07-05 QLK1576 SYD → MCY Jul 5, 00:05 UTCJul 5, 01:25 UTC1h 20m
2026-07-04 QLK1506 - Jul 4, 04:40 UTCJul 4, 08:35 UTC3h 55m
2026-07-03 QLK1504 - Jul 3, 23:15 UTCJul 4, 03:35 UTC4h 20m
2026-07-03 QLK1514 MEL → SYD Jul 3, 20:20 UTCJul 3, 21:30 UTC1h 10m
2026-07-03 QLK1259 - Jul 3, 12:25 UTCJul 3, 13:05 UTC40m
2026-07-03 QLK1259 - Jul 3, 10:55 UTCJul 3, 12:20 UTC1h 25m
2026-07-03 QLK1554 - Jul 3, 05:00 UTCJul 3, 06:25 UTC1h 25m
2026-07-02 QLK1550 BNE → BNE Jul 2, 23:10 UTCJul 3, 03:25 UTC4h 15m
2026-07-02 QLK1556 BNE → BNE Jul 2, 09:30 UTCJul 2, 21:40 UTC12h 10m
2026-07-02 QLK1593 - Jul 2, 05:15 UTCJul 2, 06:35 UTC1h 20m
2026-07-02 QLK1592 BNE → HAP Jul 2, 02:35 UTCJul 2, 03:55 UTC1h 20m
2026-07-01 QLK1546 BNE → BNE Jul 1, 21:00 UTCJul 2, 01:15 UTC4h 15m
2026-07-01 QLK1254 MEL → BNE Jul 1, 06:40 UTCJul 1, 08:35 UTC1h 55m
2026-07-01 QLK1255 BNE → MEL Jul 1, 03:15 UTCJul 1, 05:35 UTC2h 20m
2026-06-30 QLK1252 - Jun 30, 23:50 UTCJul 1, 01:40 UTC1h 50m
2026-06-30 QLK1251 BNE → MEL Jun 30, 20:25 UTCJun 30, 22:50 UTC2h 25m

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-X4H page for operator, model, and routing details .

Mode-S 7C78AF frequently asked

What is Mode-S code 7C78AF?
7C78AF is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-X4H.
Where is Mode-S 7C78AF registered?
Mode-S code 7C78AF is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C78AF broadcasting right now?
Mode-S 7C78AF is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C78AF, octal 37074257, decimal 8,157,359.
What flights does 7C78AF operate?
Mode-S 7C78AF has broadcast 20 distinct callsigns, including QLK1534, QLK1577, QLK282, QLK1576, QLK1575.