Apparatus

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sensors Mode-S transponder

7C78AE

ICAO 24-bit transponder address · allocated to Australia

Currently assigned to VH-X4G · AIRBUS A220-300 · operated by NATIONAL JET SYSTEMS PTY LTD

Hex
7C78AE
Octal
37074256
Decimal
8,157,358
Country
AU
Tail
VH-X4G
Type
BCS3
Broadcasting now · callsign QLK1574 · 24,325 ft
Flights observed
369
Distinct callsigns
20
Country
AU
Last broadcast
2h ago

Current position

7C78AE is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 7C78AE 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
QLK1527 - 12 2026-07-02
QLK1524 - 12 2026-07-02
QLK1525 - 11 2026-06-30
QLK1522 - 10 2026-06-30
QLK1520 - 10 2026-06-29
QLK1523 - 9 2026-06-30
QLK1259 - 9 2026-07-13
QLK1532 - 8 2026-06-24
QLK1529 - 8 2026-06-30
QLK1516 - 8 2026-07-07
QLK1290 - 8 2026-06-12
QLK282 - 7 2026-05-04
QLK1578 - 7 2026-06-25
QLK1550 - 7 2026-07-09
QLK1530 - 7 2026-06-29
QLK1526 - 7 2026-06-30
QLK1508 - 7 2026-06-24
QLK1598 - 6 2026-06-26
QLK1592 - 6 2026-07-07
QLK1581 - 6 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 QLK1573 - Jul 14, 00:45 UTCJul 14, 02:50 UTC2h 5m
2026-07-13 QLK1572 - Jul 13, 22:05 UTCJul 13, 23:55 UTC1h 50m
2026-07-13 QLK1259 BNE → MEL Jul 13, 11:05 UTCJul 13, 13:15 UTC2h 10m
2026-07-13 QLK1566 BNE → BNE Jul 13, 04:55 UTCJul 13, 09:45 UTC4h 50m
2026-07-12 QLK1562 - Jul 12, 22:35 UTCJul 13, 03:40 UTC5h 5m
2026-07-12 QLK1264 MEL → BNE Jul 12, 07:05 UTCJul 12, 09:05 UTC2h 0m
2026-07-12 QLK1263 BNE → MEL Jul 12, 03:45 UTCJul 12, 06:01 UTC2h 15m
2026-07-10 QLK1555 - Jul 10, 06:00 UTCJul 10, 10:15 UTC4h 15m
2026-07-09 QLK1550 BNE → BNE Jul 9, 23:10 UTCJul 10, 03:35 UTC4h 25m
2026-07-09 QLK1556 BNE → BNE Jul 9, 09:40 UTCJul 9, 21:45 UTC12h 5m
2026-07-09 QLK1254 - Jul 9, 06:25 UTCJul 9, 08:25 UTC2h 0m
2026-07-09 QLK1255 BNE → MEL Jul 9, 03:10 UTCJul 9, 05:15 UTC2h 5m
2026-07-08 QLK1546 BNE → BNE Jul 8, 21:35 UTCJul 9, 01:40 UTC4h 5m
2026-07-08 QLK1284 ADL → BNE Jul 8, 08:40 UTCJul 8, 10:50 UTC2h 10m
2026-07-08 QLK1283 BNE → ADL Jul 8, 04:55 UTCJul 8, 07:35 UTC2h 40m
2026-07-07 QLK1550 BNE → BNE Jul 7, 23:25 UTCJul 8, 03:35 UTC4h 10m
2026-07-07 QLK1516 - Jul 7, 20:20 UTCJul 7, 21:45 UTC1h 25m
2026-07-07 QLK1517 - Jul 7, 09:40 UTCJul 7, 11:10 UTC1h 30m
2026-07-07 QLK1593 - Jul 7, 05:10 UTCJul 7, 06:20 UTC1h 10m
2026-07-07 QLK1592 BNE → HAP Jul 7, 02:40 UTCJul 7, 04:05 UTC1h 25m
2026-07-06 QLK1546 BNE → BNE Jul 6, 21:00 UTCJul 7, 01:20 UTC4h 20m
2026-07-06 QLK1554 - Jul 6, 05:00 UTCJul 6, 09:25 UTC4h 25m
2026-07-05 QLK1550 BNE → BNE Jul 5, 23:15 UTCJul 6, 03:40 UTC4h 25m
2026-07-05 QLK1516 - Jul 5, 20:15 UTCJul 5, 21:50 UTC1h 35m
2026-07-05 QLK1517 - Jul 5, 09:30 UTCJul 5, 10:55 UTC1h 25m
2026-07-05 QLK1593 - Jul 5, 05:20 UTCJul 5, 06:40 UTC1h 20m
2026-07-05 QLK1592 - Jul 5, 02:35 UTCJul 5, 04:05 UTC1h 30m
2026-07-04 QLK1282 ADL → BNE Jul 4, 04:15 UTCJul 4, 06:20 UTC2h 5m
2026-07-04 QLK1281 BNE → ADL Jul 4, 00:20 UTCJul 4, 02:45 UTC2h 25m
2026-07-03 QLK1516 - Jul 3, 20:20 UTCJul 3, 21:45 UTC1h 25m
2026-07-03 QLK1517 - Jul 3, 09:25 UTCJul 3, 11:00 UTC1h 35m
2026-07-03 QLK1593 - Jul 3, 05:00 UTCJul 3, 06:15 UTC1h 15m
2026-07-03 QLK1592 BNE → HAP Jul 3, 02:35 UTCJul 3, 03:55 UTC1h 20m
2026-07-02 QLK1546 BNE → BNE Jul 2, 21:05 UTCJul 3, 01:10 UTC4h 5m
2026-07-02 QLK1258 - Jul 2, 10:50 UTCJul 2, 12:40 UTC1h 50m
2026-07-02 QLK1527 - Jul 2, 07:50 UTCJul 2, 08:45 UTC55m
2026-07-02 QLK1524 - Jul 2, 06:15 UTCJul 2, 06:45 UTC30m
2026-07-01 QLK1571 - Jul 1, 21:00 UTCJul 1, 23:10 UTC2h 10m
2026-07-01 QLK1570 - Jul 1, 10:45 UTCJul 1, 12:35 UTC1h 50m
2026-07-01 QLK1575 - Jul 1, 07:00 UTCJul 1, 09:10 UTC2h 10m
2026-07-01 QLK1574 - Jul 1, 04:05 UTCJul 1, 05:45 UTC1h 40m
2026-07-01 QLK1573 - Jul 1, 00:45 UTCJul 1, 03:00 UTC2h 15m
2026-06-30 QLK1572 - Jun 30, 21:50 UTCJun 30, 23:30 UTC1h 40m
2026-06-30 QLK1529 - Jun 30, 08:35 UTCJun 30, 09:30 UTC55m
2026-06-30 QLK1526 - Jun 30, 06:45 UTCJun 30, 07:30 UTC45m
2026-06-30 QLK1525 - Jun 30, 04:20 UTCJun 30, 05:15 UTC55m
2026-06-30 QLK1522 - Jun 30, 02:30 UTCJun 30, 03:15 UTC45m
2026-06-30 QLK1523 - Jun 30, 00:20 UTCJun 30, 01:09 UTC50m
2026-06-29 QLK1520 - Jun 29, 22:35 UTCJun 29, 23:19 UTC45m
2026-06-29 QLK1519 - Jun 29, 20:24 UTCJun 29, 21:14 UTC50m

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-X4G page for operator, model, and routing details .

Mode-S 7C78AE frequently asked

What is Mode-S code 7C78AE?
7C78AE is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-X4G.
Where is Mode-S 7C78AE registered?
Mode-S code 7C78AE is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C78AE broadcasting right now?
Yes. Mode-S 7C78AE is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C78AE, octal 37074256, decimal 8,157,358.
What flights does 7C78AE operate?
Mode-S 7C78AE has broadcast 20 distinct callsigns, including QLK1527, QLK1524, QLK1525, QLK1522, QLK1520.