Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
Broadcasting now · callsign QLK1280 · 37,000 ft
Flights observed
418
Distinct callsigns
20
Country
AU
Last broadcast
Jul 26, 21:45 UTC

Current position

7C78AF is currently broadcasting. Map zoomed to live position.

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
QLK1577 - 12 2026-07-15
QLK1534 - 12 2026-07-12
QLK1576 - 11 2026-07-15
QLK282 - 10 2026-07-08
QLK1578 - 10 2026-07-14
QLK1575 - 10 2026-06-21
QLK1581 - 9 2026-07-15
QLK1580 - 9 2026-07-15
QLK1579 - 9 2026-07-14
QLK1574 - 9 2026-06-21
QLK1515 - 9 2026-07-15
QLK1296 - 9 2026-07-19
QLK1283 - 9 2026-07-24
QLK281 - 8 2026-07-07
QLK1550 - 8 2026-07-19
QLK1533 - 8 2026-05-20
QLK1532 - 8 2026-05-25
QLK1527 - 8 2026-07-23
QLK1514 - 8 2026-07-13
QLK1508 - 8 2026-05-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 QLK1277 - Jul 26, 21:10 UTCJul 26, 21:45 UTC35m
2026-07-26 QLK1566 BNE → BNE Jul 26, 04:50 UTCJul 26, 09:45 UTC4h 56m
2026-07-25 QLK1562 BNE → BNE Jul 25, 22:40 UTCJul 26, 03:35 UTC4h 55m
2026-07-24 QLK1284 ADL → BNE Jul 24, 08:25 UTCJul 24, 10:25 UTC2h 0m
2026-07-24 QLK1283 - Jul 24, 06:55 UTCJul 24, 07:20 UTC25m
2026-07-24 QLK1283 - Jul 24, 04:45 UTCJul 24, 05:50 UTC1h 5m
2026-07-24 QLK1280 ADL → BNE Jul 24, 00:55 UTCJul 24, 02:50 UTC1h 55m
2026-07-23 QLK1277 - Jul 23, 21:00 UTCJul 23, 23:55 UTC2h 55m
2026-07-23 QLK1258 MEL → BNE Jul 23, 10:30 UTCJul 23, 12:20 UTC1h 50m
2026-07-23 QLK1527 - Jul 23, 07:40 UTCJul 23, 08:40 UTC1h 0m
2026-07-23 QLK1524 - Jul 23, 05:50 UTCJul 23, 06:35 UTC45m
2026-07-22 QLK1292 MEL → MEL Jul 22, 22:10 UTCJul 23, 01:15 UTC3h 5m
2026-07-22 QLK1259 - Jul 22, 11:10 UTCJul 22, 13:10 UTC2h 0m
2026-07-22 QLK1566 - Jul 22, 04:50 UTCJul 22, 05:25 UTC35m
2026-07-21 QLK1562 BNE → BNE Jul 21, 22:30 UTCJul 22, 03:35 UTC5h 5m
2026-07-21 QLK1284 ADL → BNE Jul 21, 08:55 UTCJul 21, 10:55 UTC2h 0m
2026-07-21 QLK1283 BNE → ADL Jul 21, 05:00 UTCJul 21, 07:45 UTC2h 45m
2026-07-20 QLK1562 BNE → BNE Jul 20, 22:20 UTCJul 21, 03:25 UTC5h 4m
2026-07-20 QLK1566 - Jul 20, 05:00 UTCJul 20, 10:00 UTC5h 0m
2026-07-19 QLK1550 BNE → BNE Jul 19, 23:10 UTCJul 20, 03:35 UTC4h 25m
2026-07-19 QLK1516 - Jul 19, 20:20 UTCJul 19, 21:45 UTC1h 25m
2026-07-19 QLK1530 - Jul 19, 10:40 UTCJul 19, 11:30 UTC50m
2026-07-19 QLK1296 - Jul 19, 06:40 UTCJul 19, 09:35 UTC2h 55m
2026-07-19 QLK1525 - Jul 19, 04:25 UTCJul 19, 05:20 UTC55m
2026-07-17 QLK1517 - Jul 17, 09:25 UTCJul 17, 10:50 UTC1h 25m
2026-07-17 QLK1593 - Jul 17, 05:10 UTCJul 17, 06:29 UTC1h 20m
2026-07-17 QLK1592 - Jul 17, 02:39 UTCJul 17, 03:55 UTC1h 15m
2026-07-16 QLK1546 BNE → BNE Jul 16, 20:45 UTCJul 17, 01:09 UTC4h 25m
2026-07-16 QLK1258 MEL → BNE Jul 16, 10:15 UTCJul 16, 12:14 UTC2h 0m
2026-07-16 QLK1527 - Jul 16, 08:00 UTCJul 16, 08:50 UTC50m
2026-07-16 QLK1524 - Jul 16, 05:55 UTCJul 16, 06:45 UTC50m
2026-07-15 QLK1291 MEL → MEL Jul 15, 22:10 UTCJul 16, 01:25 UTC3h 15m
2026-07-15 QLK1515 - Jul 15, 10:15 UTCJul 15, 11:25 UTC1h 10m
2026-07-15 QLK1581 MCY → SYD Jul 15, 07:25 UTCJul 15, 08:50 UTC1h 25m
2026-07-15 QLK1580 - Jul 15, 05:10 UTCJul 15, 06:30 UTC1h 20m
2026-07-15 QLK1577 - Jul 15, 02:35 UTCJul 15, 03:55 UTC1h 20m
2026-07-15 QLK1576 - Jul 15, 00:10 UTCJul 15, 01:30 UTC1h 20m
2026-07-14 QLK1579 - Jul 14, 21:05 UTCJul 14, 22:35 UTC1h 30m
2026-07-14 QLK1578 SYD → MCY Jul 14, 10:10 UTCJul 14, 11:30 UTC1h 20m
2026-07-14 QLK1506 SYD → SYD Jul 14, 04:35 UTCJul 14, 08:40 UTC4h 5m
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

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?
Yes. Mode-S 7C78AF is currently airborne.
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 QLK1577, QLK1534, QLK1576, QLK282, QLK1578.