Apparatus

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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
No current signal · last broadcast 2h ago
Flights observed
120
Distinct callsigns
13
Country
AU
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 7C4921.

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 13 distinct

Callsign Airline Flights Last seen
QFA1 - 22 2026-07-14
QFA7 - 19 2026-07-12
QFA8 - 18 2026-07-13
QFA2 - 18 2026-07-02
QFA12 - 12 2026-06-25
QFA11 - 10 2026-06-23
QFA64 - 8 2026-06-22
QFA63 - 7 2026-06-22
QFA81 - 2 2026-06-14
QFA94 Qantas 1 2026-05-29
QFA93 Qantas 1 2026-05-30
QFA8D - 1 2026-06-17
QFA82 Qantas 1 2026-06-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 QFA1 - Jul 14, 05:25 UTCJul 14, 06:00 UTC35m
2026-07-13 QFA8 DFW → SYD Jul 13, 04:50 UTCJul 13, 20:55 UTC16h 5m
2026-07-12 QFA7 SYD → DFW Jul 12, 03:01 UTCJul 12, 17:50 UTC14h 50m
2026-07-11 QFA8 DFW → SYD Jul 11, 04:35 UTCJul 11, 20:30 UTC15h 55m
2026-07-10 QFA7 SYD → DFW Jul 10, 05:30 UTCJul 10, 20:05 UTC14h 35m
2026-07-09 QFA8 DFW → SYD Jul 9, 04:30 UTCJul 9, 20:35 UTC16h 5m
2026-07-08 QFA7 SYD → DFW Jul 8, 03:20 UTCJul 8, 18:00 UTC14h 40m
2026-07-06 QFA8 DFW → SYD Jul 6, 04:50 UTCJul 6, 20:55 UTC16h 5m
2026-07-05 QFA7 SYD → DFW Jul 5, 03:20 UTCJul 5, 17:50 UTC14h 30m
2026-07-04 QFA8 DFW → SYD Jul 4, 05:00 UTCJul 4, 21:20 UTC16h 20m
2026-07-03 QFA7 SYD → DFW Jul 3, 03:20 UTCJul 3, 17:50 UTC14h 30m
2026-07-02 QFA2 - Jul 2, 19:00 UTCJul 2, 19:30 UTC30m
2026-07-01 QFA2 - Jul 1, 21:50 UTCJul 2, 10:20 UTC12h 30m
2026-06-30 QFA1 - Jun 30, 18:00 UTCJul 1, 07:20 UTC13h 20m
2026-06-30 QFA1 - Jun 30, 13:30 UTCJun 30, 13:40 UTC10m
2026-06-30 QFA1 - Jun 30, 05:55 UTCJun 30, 06:30 UTC35m
2026-06-29 QFA8 DFW → SYD Jun 29, 04:50 UTCJun 29, 21:09 UTC16h 20m
2026-06-28 QFA7 SYD → DFW Jun 28, 03:29 UTCJun 28, 18:29 UTC15h 0m
2026-06-27 QFA8 DFW → SYD Jun 27, 04:54 UTCJun 27, 20:59 UTC16h 5m
2026-06-26 QFA7 SYD → DFW Jun 26, 03:50 UTCJun 26, 18:29 UTC14h 40m
2026-06-25 QFA12 - Jun 25, 06:55 UTCJun 25, 21:10 UTC14h 15m
2026-06-23 QFA11 - Jun 23, 08:25 UTCJun 23, 21:24 UTC13h 0m
2026-06-22 QFA64 - Jun 22, 17:20 UTCJun 23, 04:45 UTC11h 25m
2026-06-22 QFA63 - Jun 22, 00:10 UTCJun 22, 14:10 UTC14h 0m
2026-06-21 QFA2 - Jun 21, 18:25 UTCJun 21, 19:09 UTC45m
2026-06-20 QFA2 - Jun 20, 20:29 UTCJun 21, 08:54 UTC12h 25m
2026-06-19 QFA1 - Jun 19, 15:59 UTCJun 20, 05:24 UTC13h 25m
2026-06-19 QFA1 - Jun 19, 06:39 UTCJun 19, 07:04 UTC25m
2026-06-19 QFA1 - Jun 19, 05:19 UTCJun 19, 05:54 UTC35m
2026-06-18 QFA8 DFW → SYD Jun 18, 04:35 UTCJun 18, 20:45 UTC16h 10m
2026-06-17 QFA7 SYD → DFW Jun 17, 08:45 UTCJun 17, 23:30 UTC14h 45m
2026-06-17 QFA8D - Jun 17, 02:35 UTCJun 17, 05:30 UTC2h 55m
2026-06-16 QFA8 DFW → AKL Jun 16, 08:15 UTCJun 16, 21:55 UTC13h 41m
2026-06-15 QFA7 SYD → DFW Jun 15, 02:35 UTCJun 15, 17:25 UTC14h 50m
2026-06-14 QFA82 SIN → SYD Jun 14, 13:50 UTCJun 14, 20:30 UTC6h 40m
2026-06-14 QFA81 - Jun 14, 10:05 UTCJun 14, 10:15 UTC10m
2026-06-14 QFA81 - Jun 14, 02:25 UTCJun 14, 03:00 UTC35m
2026-06-13 QFA2 - Jun 13, 16:50 UTCJun 13, 23:35 UTC6h 45m
2026-06-12 QFA2 - Jun 12, 22:05 UTCJun 13, 10:15 UTC12h 9m
2026-06-11 QFA1 - Jun 11, 16:15 UTCJun 12, 05:35 UTC13h 21m
2026-06-11 QFA1 SYD → SIN Jun 11, 05:15 UTCJun 11, 05:50 UTC35m
2026-06-10 QFA8 DFW → SYD Jun 10, 04:40 UTCJun 10, 20:40 UTC16h 0m
2026-06-09 QFA7 SYD → DFW Jun 9, 02:30 UTCJun 9, 19:05 UTC16h 35m
2026-06-08 QFA8 DFW → SYD Jun 8, 04:45 UTCJun 8, 21:15 UTC16h 30m
2026-06-07 QFA7 SYD → DFW Jun 7, 07:40 UTCJun 7, 22:20 UTC14h 40m
2026-06-06 QFA64 JNB → SYD Jun 6, 17:10 UTCJun 7, 04:55 UTC11h 45m
2026-06-06 QFA63 SYD → JNB Jun 6, 13:25 UTCJun 6, 13:44 UTC20m
2026-06-06 QFA63 SYD → JNB Jun 6, 00:05 UTCJun 6, 01:50 UTC1h 45m
2026-06-05 QFA12 LAX → SYD Jun 5, 20:25 UTCJun 5, 21:15 UTC50m
2026-06-05 QFA12 LAX → SYD Jun 5, 06:55 UTCJun 5, 07:15 UTC20m

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 .

Mode-S 7C4921 frequently asked

What is Mode-S code 7C4921?
7C4921 is an ICAO 24-bit transponder address. Allocated to Australia. Assigned to VH-OQB.
Where is Mode-S 7C4921 registered?
Mode-S code 7C4921 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7C4921 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7C4921, octal 37044441, decimal 8,145,185.
What flights does 7C4921 operate?
Mode-S 7C4921 has broadcast 13 distinct callsigns, including QFA1, QFA7, QFA8, QFA2, QFA12.