Apparatus

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sensors Mode-S transponder

4242F4

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to VP-BBS · BOEING 787-8 Dreamliner

Hex
4242F4
Octal
20441364
Decimal
4,342,516
Country
GB
Tail
VP-BBS
Type
B788
No current signal · last broadcast 9h ago
Flights observed
222
Distinct callsigns
20
Country
GB
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S 4242F4.

Country allocation

The ICAO 24-bit address 4242F4 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
AHY075 - 36 2026-07-15
AHY008 - 23 2026-07-16
AHY007 - 23 2026-07-16
AHY077 - 21 2026-06-28
AHY021 - 21 2026-07-16
AHY067 - 18 2026-07-17
AHY022 - 18 2026-07-16
AHY078 - 12 2026-06-28
AHY076 - 9 2026-07-08
AHY068 - 7 2026-07-17
AHY321 Azerbaijan Airlines 6 2026-07-13
AHY331 - 5 2026-07-15
AHY322 - 5 2026-07-13
AHY332 - 4 2026-07-15
AHY8003 Azerbaijan Airlines 2 2026-06-24
AHY121 Azerbaijan Airlines 2 2026-05-25
AHY023 - 2 2026-06-17
AHY8240 Azerbaijan Airlines 1 2026-06-26
AHY8230 - 1 2026-07-07
AHY8229 - 1 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 AHY068 - Jul 17, 18:29 UTCJul 17, 18:44 UTC15m
2026-07-17 AHY067 - Jul 17, 14:35 UTCJul 17, 14:50 UTC15m
2026-07-16 AHY008 - Jul 16, 22:25 UTCJul 17, 02:39 UTC4h 15m
2026-07-16 AHY007 - Jul 16, 14:45 UTCJul 16, 20:00 UTC5h 15m
2026-07-16 AHY022 - Jul 16, 09:50 UTCJul 16, 11:45 UTC1h 55m
2026-07-16 AHY021 - Jul 16, 05:35 UTCJul 16, 08:20 UTC2h 45m
2026-07-15 AHY332 - Jul 15, 21:15 UTCJul 15, 23:15 UTC2h 0m
2026-07-15 AHY331 - Jul 15, 10:30 UTCJul 15, 19:45 UTC9h 15m
2026-07-15 AHY075 - Jul 15, 08:05 UTCJul 15, 08:35 UTC30m
2026-07-14 AHY075 - Jul 14, 23:05 UTCJul 15, 07:30 UTC8h 25m
2026-07-14 AHY068 - Jul 14, 18:55 UTCJul 14, 19:05 UTC10m
2026-07-14 AHY067 - Jul 14, 14:25 UTCJul 14, 14:50 UTC25m
2026-07-13 AHY322 - Jul 13, 20:35 UTCJul 13, 22:35 UTC2h 0m
2026-07-13 AHY321 GYD → TLV Jul 13, 16:30 UTCJul 13, 19:05 UTC2h 35m
2026-07-13 AHY022 - Jul 13, 10:25 UTCJul 13, 12:25 UTC2h 0m
2026-07-13 AHY021 - Jul 13, 05:40 UTCJul 13, 08:05 UTC2h 25m
2026-07-12 AHY322 - Jul 12, 20:10 UTCJul 12, 22:10 UTC2h 0m
2026-07-12 AHY321 GYD → TLV Jul 12, 15:55 UTCJul 12, 18:30 UTC2h 35m
2026-07-12 AHY022 - Jul 12, 09:40 UTCJul 12, 11:40 UTC2h 0m
2026-07-11 AHY021 TLV → TLV Jul 11, 21:10 UTCJul 12, 08:01 UTC10h 50m
2026-07-11 AHY331 - Jul 11, 09:15 UTCJul 11, 19:45 UTC10h 30m
2026-07-11 AHY075 - Jul 11, 06:55 UTCJul 11, 07:15 UTC20m
2026-07-11 AHY075 - Jul 11, 04:55 UTCJul 11, 06:15 UTC1h 20m
2026-07-10 AHY022 - Jul 10, 08:50 UTCJul 10, 10:50 UTC2h 0m
2026-07-10 AHY021 - Jul 10, 04:45 UTCJul 10, 07:30 UTC2h 45m
2026-07-09 AHY322 - Jul 9, 22:10 UTCJul 10, 00:05 UTC1h 55m
2026-07-09 AHY321 GYD → TLV Jul 9, 11:05 UTCJul 9, 20:35 UTC9h 30m
2026-07-09 AHY075 - Jul 9, 06:55 UTCJul 9, 09:30 UTC2h 35m
2026-07-08 AHY332 - Jul 8, 21:10 UTCJul 8, 23:05 UTC1h 55m
2026-07-08 AHY331 - Jul 8, 16:55 UTCJul 8, 19:30 UTC2h 35m
2026-07-08 AHY076 - Jul 8, 10:35 UTCJul 8, 12:25 UTC1h 50m
2026-07-08 AHY075 - Jul 8, 08:05 UTCJul 8, 08:25 UTC20m
2026-07-07 AHY075 - Jul 7, 18:45 UTCJul 8, 07:30 UTC12h 45m
2026-07-07 AHY067 - Jul 7, 15:45 UTCJul 7, 16:05 UTC20m
2026-07-07 AHY8230 - Jul 7, 07:00 UTCJul 7, 07:25 UTC25m
2026-07-07 AHY8229 - Jul 7, 04:10 UTCJul 7, 04:40 UTC30m
2026-07-06 AHY322 TLV → GYD Jul 6, 20:40 UTCJul 6, 22:35 UTC1h 55m
2026-07-06 AHY321 GYD → TLV Jul 6, 16:20 UTCJul 6, 18:55 UTC2h 35m
2026-07-06 AHY022 - Jul 6, 09:40 UTCJul 6, 11:40 UTC2h 0m
2026-07-05 AHY021 - Jul 5, 18:25 UTCJul 6, 08:20 UTC13h 55m
2026-07-05 AHY067 - Jul 5, 15:00 UTCJul 5, 15:15 UTC15m
2026-07-04 AHY332 - Jul 4, 21:10 UTCJul 5, 12:00 UTC14h 50m
2026-07-04 AHY331 - Jul 4, 09:45 UTCJul 4, 19:35 UTC9h 50m
2026-07-04 AHY075 - Jul 4, 07:05 UTCJul 4, 07:25 UTC20m
2026-07-03 AHY322 TLV → GYD Jul 3, 22:00 UTCJul 4, 06:25 UTC8h 25m
2026-07-03 AHY321 GYD → TLV Jul 3, 08:55 UTCJul 3, 20:20 UTC11h 25m
2026-07-02 AHY021 TLV → TLV Jul 2, 23:25 UTCJul 3, 07:25 UTC8h 0m
2026-07-02 AHY321 GYD → TLV Jul 2, 10:55 UTCJul 2, 20:25 UTC9h 30m
2026-07-02 AHY075 - Jul 2, 08:15 UTCJul 2, 08:45 UTC30m
2026-07-02 AHY075 - Jul 2, 06:25 UTCJul 2, 07:40 UTC1h 15m

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 VP-BBS page for operator, model, and routing details .

Mode-S 4242F4 frequently asked

What is Mode-S code 4242F4?
4242F4 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to VP-BBS.
Where is Mode-S 4242F4 registered?
Mode-S code 4242F4 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 4242F4 broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4242F4, octal 20441364, decimal 4,342,516.
What flights does 4242F4 operate?
Mode-S 4242F4 has broadcast 20 distinct callsigns, including AHY075, AHY008, AHY007, AHY077, AHY021.