Apparatus

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sensors Mode-S transponder

4243FA

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to VQ-BWY · BOEING 747-8

Hex
4243FA
Octal
20441772
Decimal
4,342,778
Country
GB
Tail
VQ-BWY
Type
B748
No current signal · last broadcast 2h ago
Flights observed
176
Distinct callsigns
20
Country
GB
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 4243FA.

Country allocation

The ICAO 24-bit address 4243FA 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
AZG5721 - 15 2026-07-14
AZG5789 Sakaviaservice 10 2026-06-09
AZG5722 - 6 2026-07-14
AZG4862 Sakaviaservice 6 2026-04-13
AZG246 - 6 2026-07-07
AZG9790 - 5 2026-06-28
AZG692 - 5 2026-07-10
AZG4871 - 5 2026-07-03
AZG1647 Sakaviaservice 5 2026-05-09
AZG633 - 4 2026-06-22
AZG624 - 4 2026-06-12
AZG247 - 4 2026-07-07
AZG997 - 3 2026-04-18
AZG922 - 3 2026-07-12
AZG691 Sakaviaservice 3 2026-06-07
AZG647 Sakaviaservice 3 2026-05-10
AZG634 - 3 2026-04-15
AZG572 - 3 2026-07-13
AZG923 Sakaviaservice 2 2026-06-10
AZG8588 - 2 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 AZG5722 - Jul 14, 18:55 UTCJul 14, 20:40 UTC1h 45m
2026-07-14 AZG5721 - Jul 14, 11:25 UTCJul 14, 16:00 UTC4h 35m
2026-07-14 AZG5721 - Jul 14, 07:30 UTCJul 14, 07:45 UTC15m
2026-07-13 AZG5721 - Jul 13, 13:20 UTCJul 14, 04:50 UTC15h 30m
2026-07-13 AZG9333 - Jul 13, 06:10 UTCJul 13, 10:40 UTC4h 30m
2026-07-13 AZG572 - Jul 13, 02:20 UTCJul 13, 02:50 UTC30m
2026-07-12 AZG572 - Jul 12, 21:55 UTCJul 13, 01:20 UTC3h 25m
2026-07-12 AZG572 - Jul 12, 19:55 UTCJul 12, 20:10 UTC15m
2026-07-12 AZG922 - Jul 12, 09:15 UTCJul 12, 17:35 UTC8h 20m
2026-07-11 AZG8588 - Jul 11, 23:55 UTCJul 12, 03:50 UTC3h 55m
2026-07-11 AZG8588 - Jul 11, 13:55 UTCJul 11, 21:55 UTC8h 0m
2026-07-10 AZG4881 - Jul 10, 21:15 UTCJul 11, 09:50 UTC12h 35m
2026-07-10 AZG692 - Jul 10, 03:20 UTCJul 10, 03:35 UTC15m
2026-07-10 AZG628 - Jul 10, 00:05 UTCJul 10, 00:25 UTC20m
2026-07-09 AZG8991 - Jul 9, 13:25 UTCJul 9, 13:55 UTC30m
2026-07-07 AZG247 - Jul 7, 13:25 UTCJul 7, 13:40 UTC15m
2026-07-07 AZG246 - Jul 7, 09:20 UTCJul 7, 10:00 UTC40m
2026-07-07 AZG246 - Jul 7, 06:25 UTCJul 7, 06:45 UTC20m
2026-07-06 AZG3828 - Jul 6, 09:35 UTCJul 7, 03:05 UTC17h 30m
2026-07-06 AZG3827 - Jul 6, 02:00 UTCJul 6, 06:15 UTC4h 15m
2026-07-04 AZG5873 - Jul 4, 16:45 UTCJul 4, 21:25 UTC4h 40m
2026-07-04 AZG5872 - Jul 4, 04:10 UTCJul 4, 12:20 UTC8h 10m
2026-07-03 AZG4871 - Jul 3, 17:15 UTCJul 3, 21:00 UTC3h 45m
2026-07-03 AZG4871 - Jul 3, 04:45 UTCJul 3, 13:50 UTC9h 5m
2026-07-02 AZG4871 - Jul 2, 22:30 UTCJul 3, 02:40 UTC4h 10m
2026-07-01 AZG238 HHN → GYD Jul 1, 16:40 UTCJul 1, 20:25 UTC3h 45m
2026-07-01 AZG237 - Jul 1, 06:05 UTCJul 1, 10:05 UTC4h 0m
2026-06-30 AZG217 - Jun 30, 01:00 UTCJun 30, 03:00 UTC2h 1m
2026-06-29 AZG216 - Jun 29, 18:30 UTCJun 29, 20:54 UTC2h 25m
2026-06-29 AZG9791 ORD → LUX Jun 29, 02:39 UTCJun 29, 13:44 UTC11h 5m
2026-06-28 AZG9790 - Jun 28, 11:35 UTCJun 28, 19:44 UTC8h 10m
2026-06-28 AZG9790 - Jun 28, 05:15 UTCJun 28, 09:20 UTC4h 5m
2026-06-27 AZG9803 - Jun 27, 18:49 UTCJun 28, 00:59 UTC6h 10m
2026-06-27 AZG427 - Jun 27, 14:29 UTCJun 27, 14:54 UTC25m
2026-06-26 AZG247 - Jun 26, 23:19 UTCJun 26, 23:39 UTC20m
2026-06-26 AZG246 - Jun 26, 19:20 UTCJun 26, 19:39 UTC20m
2026-06-26 AZG246 - Jun 26, 11:45 UTCJun 26, 18:39 UTC6h 55m
2026-06-26 AZG9790 - Jun 26, 03:10 UTCJun 26, 07:00 UTC3h 50m
2026-06-25 AZG9790 - Jun 25, 16:14 UTCJun 26, 01:29 UTC9h 15m
2026-06-25 AZG9790 - Jun 25, 10:39 UTCJun 25, 13:00 UTC2h 20m
2026-06-24 AZG4861 LGG → ORD Jun 24, 22:04 UTCJun 25, 06:35 UTC8h 30m
2026-06-24 AZG4861 - Jun 24, 03:55 UTCJun 24, 19:49 UTC15h 55m
2026-06-23 AZG1211 - Jun 23, 07:35 UTCJun 24, 01:09 UTC17h 35m
2026-06-22 AZG633 - Jun 22, 21:30 UTCJun 23, 03:00 UTC5h 30m
2026-06-22 AZG3822 - Jun 22, 10:30 UTCJun 22, 14:19 UTC3h 50m
2026-06-22 AZG3821 - Jun 22, 00:55 UTCJun 22, 05:04 UTC4h 10m
2026-06-21 AZG208 AMS → GYD Jun 21, 16:59 UTCJun 21, 20:59 UTC4h 0m
2026-06-21 AZG207 GYD → AMS Jun 21, 08:15 UTCJun 21, 12:44 UTC4h 30m
2026-06-20 AZG247 HKG → HKG Jun 20, 20:29 UTCJun 20, 20:45 UTC15m
2026-06-20 AZG246 - Jun 20, 17:44 UTCJun 20, 18:04 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 VQ-BWY page for operator, model, and routing details .

Mode-S 4243FA frequently asked

What is Mode-S code 4243FA?
4243FA is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to VQ-BWY.
Where is Mode-S 4243FA registered?
Mode-S code 4243FA 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 4243FA 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 4243FA, octal 20441772, decimal 4,342,778.
What flights does 4243FA operate?
Mode-S 4243FA has broadcast 20 distinct callsigns, including AZG5721, AZG5789, AZG5722, AZG4862, AZG246.