Apparatus

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sensors Mode-S transponder

4243C4

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to VQ-BVC · BOEING 747-8

Hex
4243C4
Octal
20441704
Decimal
4,342,724
Country
GB
Tail
VQ-BVC
Type
B748
No current signal · last broadcast 3d ago
Flights observed
63
Distinct callsigns
20
Country
GB
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S 4243C4.

Country allocation

The ICAO 24-bit address 4243C4 falls within the block assigned to United Kingdom (GB) by ICAO Annex 10, Volume III. Every aircraft registered in United Kingdom 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
AZG128 - 5 2026-06-30
AZG129 Sakaviaservice 4 2026-06-30
AZG124 Sakaviaservice 4 2026-06-21
AZG998 - 3 2026-07-04
AZG997 - 3 2026-07-04
AZG904 Sakaviaservice 3 2026-06-21
AZG5721 Sakaviaservice 3 2026-06-02
AZG121 - 3 2026-06-19
AZG903 - 2 2026-06-21
AZG648 - 2 2026-07-13
AZG647 - 2 2026-07-12
AZG5789 Sakaviaservice 2 2026-06-03
AZG208 - 2 2026-06-28
AZG207 Sakaviaservice 2 2026-06-28
AZG148 Sakaviaservice 2 2026-06-16
AZG147 - 2 2026-06-16
AZG122 - 2 2026-06-19
AZG039 Sakaviaservice 2 2026-06-23
AZG923 Sakaviaservice 1 2026-06-04
AZG772 Sakaviaservice 1 2026-06-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 AZG648 - Jul 13, 08:55 UTCJul 13, 09:10 UTC15m
2026-07-12 AZG647 - Jul 12, 21:55 UTCJul 13, 06:15 UTC8h 20m
2026-07-12 - - Jul 12, 18:35 UTCJul 12, 18:45 UTC10m
2026-07-12 AZG5515 - Jul 12, 15:35 UTCJul 12, 16:15 UTC40m
2026-07-10 AZG3824 HHN → GYD Jul 10, 12:15 UTCJul 10, 15:40 UTC3h 25m
2026-07-10 AZG3823 - Jul 10, 03:45 UTCJul 10, 08:10 UTC4h 25m
2026-07-05 AZG217 - Jul 5, 07:05 UTCJul 5, 09:00 UTC1h 55m
2026-07-05 AZG216 - Jul 5, 00:50 UTCJul 5, 03:15 UTC2h 25m
2026-07-04 AZG998 - Jul 4, 15:50 UTCJul 4, 20:30 UTC4h 40m
2026-07-04 AZG997 - Jul 4, 05:15 UTCJul 4, 10:40 UTC5h 25m
2026-06-30 AZG129 ICN → GYD Jun 30, 13:55 UTCJun 30, 14:10 UTC15m
2026-06-30 AZG128 - Jun 30, 10:20 UTCJun 30, 10:50 UTC30m
2026-06-30 AZG128 - Jun 30, 09:15 UTCJun 30, 09:40 UTC25m
2026-06-28 AZG208 - Jun 28, 20:19 UTCJun 29, 00:20 UTC4h 0m
2026-06-28 AZG207 GYD → AMS Jun 28, 12:55 UTCJun 28, 17:25 UTC4h 30m
2026-06-28 AZG762 LGG → GYD Jun 28, 04:50 UTCJun 28, 08:44 UTC3h 55m
2026-06-27 AZG998 - Jun 27, 10:54 UTCJun 28, 00:00 UTC13h 5m
2026-06-27 AZG997 - Jun 27, 01:39 UTCJun 27, 06:35 UTC4h 55m
2026-06-23 AZG039 GYD → PVG Jun 23, 19:15 UTCJun 24, 07:59 UTC12h 45m
2026-06-23 AZG129 ICN → GYD Jun 23, 12:35 UTCJun 24, 07:59 UTC19h 25m
2026-06-23 AZG129 ICN → GYD Jun 23, 11:24 UTCJun 23, 11:40 UTC15m
2026-06-23 AZG128 GYD → ICN Jun 23, 07:35 UTCJun 23, 07:55 UTC20m
2026-06-23 AZG128 GYD → ICN Jun 23, 06:24 UTCJun 23, 06:49 UTC25m
2026-06-21 AZG124 ICN → GYD Jun 21, 13:09 UTCJun 21, 13:29 UTC20m
2026-06-21 AZG904 NRT → GYD Jun 21, 08:15 UTCJun 21, 10:19 UTC2h 5m
2026-06-21 AZG903 - Jun 21, 01:59 UTCJun 21, 04:44 UTC2h 45m
2026-06-19 AZG122 - Jun 19, 04:39 UTCJun 19, 04:54 UTC15m
2026-06-19 AZG121 - Jun 19, 00:59 UTCJun 19, 01:29 UTC30m
2026-06-17 AZG129 ICN → GYD Jun 17, 06:10 UTCJun 17, 06:25 UTC15m
2026-06-17 AZG128 GYD → ICN Jun 17, 02:45 UTCJun 17, 03:05 UTC20m
2026-06-16 AZG148 HKG → GYD Jun 16, 08:49 UTCJun 16, 09:10 UTC20m
2026-06-16 AZG147 - Jun 16, 04:10 UTCJun 16, 04:50 UTC40m
2026-06-15 AZG772 LGG → GYD Jun 15, 10:30 UTCJun 15, 14:20 UTC3h 50m
2026-06-15 AZG771 ORD → LGG Jun 15, 02:39 UTCJun 15, 07:10 UTC4h 30m
2026-06-14 AZG208 AMS → GYD Jun 14, 18:05 UTCJun 14, 21:55 UTC3h 50m
2026-06-14 AZG207 GYD → AMS Jun 14, 09:20 UTCJun 14, 14:05 UTC4h 45m
2026-06-13 AZG625 HKG → HKG Jun 13, 20:40 UTCJun 13, 21:00 UTC20m
2026-06-13 AZG624 - Jun 13, 12:15 UTCJun 13, 17:40 UTC5h 25m
2026-06-13 AZG3321 GYD → BOM Jun 13, 08:45 UTCJun 13, 09:05 UTC20m
2026-06-12 AZG998 MAD → GYD Jun 12, 17:30 UTCJun 12, 22:30 UTC5h 0m
2026-06-12 AZG997 - Jun 12, 08:25 UTCJun 12, 13:45 UTC5h 20m
2026-06-10 AZG039 GYD → PVG Jun 10, 15:05 UTCJun 10, 15:30 UTC25m
2026-06-09 AZG148 HKG → GYD Jun 9, 15:15 UTCJun 9, 15:40 UTC25m
2026-06-09 AZG147 - Jun 9, 11:55 UTCJun 9, 12:20 UTC25m
2026-06-07 AZG124 ICN → GYD Jun 7, 18:40 UTCJun 7, 21:40 UTC3h 0m
2026-06-07 AZG904 NRT → GYD Jun 7, 08:25 UTCJun 7, 10:20 UTC1h 55m
2026-06-07 AZG903 - Jun 7, 02:04 UTCJun 7, 05:10 UTC3h 5m
2026-06-05 AZG122 - Jun 5, 09:00 UTCJun 5, 09:20 UTC20m
2026-06-05 AZG121 - Jun 5, 05:30 UTCJun 5, 05:50 UTC20m
2026-06-05 AZG121 - Jun 5, 04:25 UTCJun 5, 04:40 UTC15m

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 VQ-BVC page for operator, model, and routing details .

Mode-S 4243C4 frequently asked

What is Mode-S code 4243C4?
4243C4 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to VQ-BVC.
Where is Mode-S 4243C4 registered?
Mode-S code 4243C4 is allocated to United Kingdom (GB). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4243C4 broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4243C4, octal 20441704, decimal 4,342,724.
What flights does 4243C4 operate?
Mode-S 4243C4 has broadcast 20 distinct callsigns, including AZG128, AZG129, AZG124, AZG998, AZG997.