Apparatus

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sensors Mode-S transponder

4003A8

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to VQ-TGY · ATR-42-500

Hex
4003A8
Octal
20001650
Decimal
4,195,240
Country
GB
Tail
VQ-TGY
Type
AT45
No current signal · last broadcast 2d ago
Flights observed
194
Distinct callsigns
20
Country
GB
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 4003A8.

Country allocation

The ICAO 24-bit address 4003A8 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
IWY766 - 17 2026-07-04
IWY705 - 15 2026-07-04
IWY712 Interisland Airways Limited 10 2026-07-05
IWY703 - 10 2026-07-10
IWY764 - 9 2026-07-10
IWY742 - 9 2026-07-10
IWY715 Interisland Airways Limited 9 2026-04-30
IWY714 Interisland Airways Limited 9 2026-04-30
IWY743 - 8 2026-07-10
IWY788 - 7 2026-07-11
IWY787 Interisland Airways Limited 6 2026-07-11
IWY745 - 6 2026-07-09
IWY713 Interisland Airways Limited 6 2026-07-08
IWY411 Interisland Airways Limited 6 2026-06-20
IWY410 Interisland Airways Limited 6 2026-06-20
IWY744 - 4 2026-07-03
IWY557 - 4 2026-07-06
IWY554 Interisland Airways Limited 4 2026-07-06
IWY512 Interisland Airways Limited 4 2026-06-17
IWY510 Interisland Airways Limited 4 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 IWY787 BGI → GEO Jul 11, 15:25 UTCJul 11, 15:40 UTC15m
2026-07-11 IWY788 - Jul 11, 00:25 UTCJul 11, 00:50 UTC25m
2026-07-10 IWY743 - Jul 10, 22:30 UTCJul 10, 23:00 UTC30m
2026-07-10 IWY742 - Jul 10, 21:30 UTCJul 10, 21:50 UTC20m
2026-07-10 IWY793 - Jul 10, 20:05 UTCJul 10, 20:25 UTC20m
2026-07-10 IWY792 - Jul 10, 17:10 UTCJul 10, 17:40 UTC30m
2026-07-10 IWY703 - Jul 10, 15:05 UTCJul 10, 15:30 UTC25m
2026-07-10 IWY703 - Jul 10, 13:55 UTCJul 10, 14:10 UTC15m
2026-07-10 IWY764 - Jul 10, 02:00 UTCJul 10, 02:10 UTC10m
2026-07-10 IWY764 - Jul 10, 01:00 UTCJul 10, 01:20 UTC20m
2026-07-09 IWY716 - Jul 9, 23:30 UTCJul 10, 00:00 UTC30m
2026-07-09 IWY716 - Jul 9, 22:30 UTCJul 9, 22:50 UTC20m
2026-07-09 IWY719 GND → BGI Jul 9, 20:35 UTCJul 9, 21:05 UTC30m
2026-07-09 IWY719 GND → BGI Jul 9, 19:25 UTCJul 9, 19:40 UTC15m
2026-07-09 IWY718 SVD → GND Jul 9, 18:15 UTCJul 9, 18:45 UTC30m
2026-07-09 IWY787 BGI → GEO Jul 9, 16:50 UTCJul 9, 17:10 UTC20m
2026-07-09 IWY788 - Jul 9, 01:45 UTCJul 9, 02:05 UTC20m
2026-07-09 IWY745 - Jul 9, 00:05 UTCJul 9, 00:35 UTC30m
2026-07-08 IWY784 - Jul 8, 22:40 UTCJul 8, 23:05 UTC25m
2026-07-08 IWY783 - Jul 8, 18:55 UTCJul 8, 19:20 UTC25m
2026-07-08 IWY713 DOM → BGI Jul 8, 17:05 UTCJul 8, 17:30 UTC25m
2026-07-08 IWY741 - Jul 8, 15:00 UTCJul 8, 15:35 UTC35m
2026-07-07 IWY741 - Jul 7, 22:55 UTCJul 7, 23:20 UTC25m
2026-07-07 IWY740 BGI → DOM Jul 7, 20:25 UTCJul 7, 20:55 UTC30m
2026-07-07 IWY782 - Jul 7, 19:10 UTCJul 7, 19:25 UTC15m
2026-07-07 IWY781 BGI → GEO Jul 7, 15:30 UTCJul 7, 15:50 UTC20m
2026-07-07 IWY787 BGI → GEO Jul 7, 13:50 UTCJul 7, 14:05 UTC15m
2026-07-06 IWY788 - Jul 6, 22:30 UTCJul 6, 22:50 UTC20m
2026-07-06 IWY557 - Jul 6, 20:30 UTCJul 6, 20:40 UTC10m
2026-07-06 IWY554 BGI → EIS Jul 6, 16:10 UTCJul 6, 16:50 UTC40m
2026-07-06 IWY751 POS → BGI Jul 6, 14:30 UTCJul 6, 15:05 UTC35m
2026-07-06 IWY752 - Jul 6, 01:10 UTCJul 6, 01:50 UTC40m
2026-07-06 IWY557 - Jul 6, 00:05 UTCJul 6, 00:20 UTC15m
2026-07-05 IWY556 - Jul 5, 19:55 UTCJul 5, 20:20 UTC25m
2026-07-05 IWY713 DOM → BGI Jul 5, 17:55 UTCJul 5, 18:15 UTC20m
2026-07-05 IWY712 BGI → DOM Jul 5, 16:10 UTCJul 5, 16:30 UTC20m
2026-07-05 IWY703 - Jul 5, 14:25 UTCJul 5, 14:50 UTC25m
2026-07-05 IWY703 - Jul 5, 13:25 UTCJul 5, 13:35 UTC10m
2026-07-05 IWY764 - Jul 5, 00:50 UTCJul 5, 01:05 UTC15m
2026-07-04 IWY764 - Jul 4, 23:50 UTCJul 5, 00:10 UTC20m
2026-07-04 IWY555 - Jul 4, 22:10 UTCJul 4, 22:25 UTC15m
2026-07-04 IWY554 BGI → EIS Jul 4, 15:20 UTCJul 4, 15:35 UTC15m
2026-07-04 IWY705 - Jul 4, 13:15 UTCJul 4, 13:35 UTC20m
2026-07-04 IWY766 - Jul 4, 00:00 UTCJul 4, 00:10 UTC10m
2026-07-03 IWY766 - Jul 3, 22:50 UTCJul 3, 23:15 UTC25m
2026-07-03 IWY744 - Jul 3, 19:10 UTCJul 3, 20:30 UTC1h 20m
2026-07-03 IWY713 DOM → BGI Jul 3, 17:20 UTCJul 3, 17:45 UTC25m
2026-07-03 IWY712 BGI → DOM Jul 3, 15:35 UTCJul 3, 16:10 UTC35m
2026-07-03 IWY705 - Jul 3, 13:15 UTCJul 3, 13:40 UTC25m
2026-06-29 IWY788 - Jun 29, 21:54 UTCJun 29, 22:19 UTC25m

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-TGY page for operator, model, and routing details .

Mode-S 4003A8 frequently asked

What is Mode-S code 4003A8?
4003A8 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to VQ-TGY.
Where is Mode-S 4003A8 registered?
Mode-S code 4003A8 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 4003A8 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4003A8, octal 20001650, decimal 4,195,240.
What flights does 4003A8 operate?
Mode-S 4003A8 has broadcast 20 distinct callsigns, including IWY766, IWY705, IWY712, IWY703, IWY764.