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 3h ago
Flights observed
66
Distinct callsigns
10
Country
AU
Last broadcast
3h 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 10 distinct

Callsign Airline Flights Last seen
QFA1 Qantas 13 2026-05-22
QFA2 Qantas 12 2026-05-24
QFA12 Qantas 8 2026-05-26
QFA11 Qantas 8 2026-05-28
QFA7 Qantas 7 2026-05-11
QFA8 Qantas 6 2026-05-12
QFA64 Qantas 6 2026-05-28
QFA63 Qantas 4 2026-05-27
QFA94 Qantas 1 2026-05-29
QFA93 Qantas 1 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 QFA93 MEL → LAX May 30, 00:50 UTCMay 30, 02:45 UTC1h 55m
2026-05-29 QFA94 LAX → MEL May 29, 05:30 UTCMay 29, 20:25 UTC14h 55m
2026-05-28 QFA11 SYD → LAX May 28, 12:05 UTCMay 29, 01:15 UTC13h 10m
2026-05-28 QFA64 JNB → SYD May 28, 03:05 UTCMay 28, 04:45 UTC1h 40m
2026-05-27 QFA64 JNB → SYD May 27, 17:05 UTCMay 27, 17:20 UTC15m
2026-05-27 QFA63 SYD → JNB May 27, 00:00 UTCMay 27, 13:30 UTC13h 31m
2026-05-26 QFA12 LAX → SYD May 26, 06:49 UTCMay 26, 21:20 UTC14h 30m
2026-05-25 QFA11 SYD → LAX May 25, 08:20 UTCMay 25, 20:50 UTC12h 29m
2026-05-24 QFA2 LHR → SIN May 24, 18:00 UTCMay 24, 19:05 UTC1h 5m
2026-05-23 QFA2 LHR → SIN May 23, 20:30 UTCMay 24, 09:25 UTC12h 55m
2026-05-22 QFA1 SYD → SIN May 22, 16:15 UTCMay 23, 05:50 UTC13h 34m
2026-05-22 QFA1 SYD → SIN May 22, 05:05 UTCMay 22, 05:40 UTC35m
2026-05-21 QFA2 LHR → SIN May 21, 23:50 UTCMay 22, 00:35 UTC45m
2026-05-20 QFA2 LHR → SIN May 20, 20:10 UTCMay 21, 08:35 UTC12h 25m
2026-05-19 QFA1 SYD → SIN May 19, 16:10 UTCMay 20, 05:25 UTC13h 16m
2026-05-19 QFA1 SYD → SIN May 19, 13:10 UTCMay 19, 13:20 UTC10m
2026-05-19 QFA1 SYD → SIN May 19, 05:15 UTCMay 19, 05:50 UTC35m
2026-05-18 QFA2 LHR → SIN May 18, 18:10 UTCMay 18, 19:05 UTC54m
2026-05-17 QFA2 LHR → SIN May 17, 20:25 UTCMay 18, 09:20 UTC12h 55m
2026-05-16 QFA1 SYD → SIN May 16, 16:05 UTCMay 17, 05:35 UTC13h 30m
2026-05-16 QFA1 SYD → SIN May 16, 05:20 UTCMay 16, 05:56 UTC36m
2026-05-15 QFA12 LAX → SYD May 15, 07:15 UTCMay 15, 21:25 UTC14h 9m
2026-05-13 QFA11 SYD → LAX May 13, 08:10 UTCMay 13, 21:05 UTC12h 55m
2026-05-12 QFA8 DFW → SYD May 12, 04:40 UTCMay 12, 21:10 UTC16h 30m
2026-05-11 QFA7 SYD → DFW May 11, 04:15 UTCMay 11, 18:35 UTC14h 20m
2026-05-10 QFA8 DFW → SYD May 10, 04:15 UTCMay 10, 20:40 UTC16h 25m
2026-05-09 QFA7 SYD → DFW May 9, 03:00 UTCMay 9, 17:25 UTC14h 25m
2026-05-08 QFA12 LAX → SYD May 8, 07:24 UTCMay 8, 21:55 UTC14h 30m
2026-05-07 QFA11 SYD → LAX May 7, 09:25 UTCMay 7, 22:50 UTC13h 25m
2026-05-07 QFA64 JNB → SYD May 7, 03:25 UTCMay 7, 05:05 UTC1h 40m
2026-05-06 QFA64 JNB → SYD May 6, 17:30 UTCMay 6, 17:50 UTC19m
2026-05-06 QFA63 SYD → JNB May 6, 00:05 UTCMay 6, 14:30 UTC14h 25m
2026-05-05 QFA2 LHR → SIN May 5, 18:35 UTCMay 5, 19:15 UTC40m
2026-05-04 QFA2 LHR → SIN May 4, 20:15 UTCMay 5, 08:15 UTC12h 0m
2026-05-03 QFA1 SYD → SIN May 3, 16:05 UTCMay 4, 05:20 UTC13h 15m
2026-05-03 QFA1 SYD → SIN May 3, 12:50 UTCMay 3, 13:05 UTC15m
2026-05-03 QFA1 SYD → SIN May 3, 05:05 UTCMay 3, 06:00 UTC55m
2026-05-02 QFA8 DFW → SYD May 2, 04:20 UTCMay 2, 21:05 UTC16h 45m
2026-05-01 QFA7 SYD → DFW May 1, 02:40 UTCMay 1, 17:10 UTC14h 30m
2026-04-30 QFA8 DFW → SYD Apr 30, 04:40 UTCApr 30, 21:15 UTC16h 35m
2026-04-29 QFA7 SYD → DFW Apr 29, 02:45 UTCApr 29, 17:01 UTC14h 16m
2026-04-28 QFA12 LAX → SYD Apr 28, 08:50 UTCApr 28, 22:45 UTC13h 55m
2026-04-26 QFA11 SYD → LAX Apr 26, 10:45 UTCApr 26, 23:35 UTC12h 50m
2026-04-25 QFA64 JNB → SYD Apr 25, 18:05 UTCApr 26, 05:35 UTC11h 30m
2026-04-25 QFA63 SYD → JNB Apr 25, 00:25 UTCApr 25, 13:55 UTC13h 30m
2026-04-24 QFA12 LAX → SYD Apr 24, 07:05 UTCApr 24, 21:30 UTC14h 25m
2026-04-23 QFA11 SYD → LAX Apr 23, 08:45 UTCApr 23, 21:50 UTC13h 4m
2026-04-22 QFA64 JNB → SYD Apr 22, 17:30 UTCApr 23, 04:30 UTC11h 0m
2026-04-22 QFA63 SYD → JNB Apr 22, 00:15 UTCApr 22, 13:55 UTC13h 40m
2026-04-21 QFA2 LHR → SIN Apr 21, 15:31 UTCApr 21, 21:15 UTC5h 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-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 3h 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 10 distinct callsigns, including QFA1, QFA2, QFA12, QFA11, QFA7.