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 Jul 26, 20:10 UTC
Flights observed
285
Distinct callsigns
20
Country
GB
Last broadcast
Jul 26, 20:10 UTC

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 Interisland Airways Limited 24 2026-07-25
IWY705 - 17 2026-07-26
IWY703 - 17 2026-07-25
IWY715 Interisland Airways Limited 16 2026-07-26
IWY714 - 13 2026-07-26
IWY712 Interisland Airways Limited 13 2026-07-20
IWY764 - 12 2026-07-16
IWY743 Interisland Airways Limited 12 2026-07-24
IWY742 Interisland Airways Limited 12 2026-07-24
IWY788 - 9 2026-07-21
IWY713 Interisland Airways Limited 9 2026-07-20
IWY787 Interisland Airways Limited 8 2026-07-21
IWY745 - 8 2026-07-20
IWY744 - 6 2026-07-20
IWY411 Interisland Airways Limited 6 2026-06-20
IWY410 Interisland Airways Limited 6 2026-06-20
IWY741 Interisland Airways Limited 5 2026-07-21
IWY740 Interisland Airways Limited 4 2026-07-21
IWY719 Interisland Airways Limited 4 2026-07-18
IWY716 - 4 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 IWY783 BGI → GEO Jul 26, 19:50 UTCJul 26, 20:10 UTC20m
2026-07-26 IWY715 SLU → BGI Jul 26, 17:10 UTCJul 26, 17:25 UTC15m
2026-07-26 IWY714 - Jul 26, 15:50 UTCJul 26, 16:05 UTC15m
2026-07-26 IWY705 - Jul 26, 14:05 UTCJul 26, 14:20 UTC15m
2026-07-26 IWY2714 - Jul 26, 12:35 UTCJul 26, 13:00 UTC25m
2026-07-26 IWY715 SLU → BGI Jul 26, 01:00 UTCJul 26, 01:25 UTC25m
2026-07-25 IWY766 SLU → DOM Jul 25, 23:55 UTCJul 26, 00:05 UTC10m
2026-07-25 IWY766 SLU → DOM Jul 25, 22:35 UTCJul 25, 23:10 UTC35m
2026-07-25 IWY782 GEO → BGI Jul 25, 20:35 UTCJul 25, 20:50 UTC15m
2026-07-25 IWY781 BGI → GEO Jul 25, 16:45 UTCJul 25, 17:05 UTC20m
2026-07-25 IWY703 - Jul 25, 14:15 UTCJul 25, 14:40 UTC25m
2026-07-25 IWY703 - Jul 25, 13:10 UTCJul 25, 13:20 UTC10m
2026-07-25 IWY2703 - Jul 25, 11:45 UTCJul 25, 12:10 UTC25m
2026-07-25 IWY2748 - Jul 25, 01:15 UTCJul 25, 01:40 UTC25m
2026-07-25 IWY748 BGI → GND Jul 25, 00:15 UTCJul 25, 00:35 UTC20m
2026-07-24 IWY743 SLU → BGI Jul 24, 22:30 UTCJul 24, 22:55 UTC25m
2026-07-24 IWY742 BGI → SLU Jul 24, 21:20 UTCJul 24, 21:40 UTC20m
2026-07-24 IWY0793 - Jul 24, 19:00 UTCJul 24, 19:35 UTC35m
2026-07-24 IWY0717 SVD → BGI Jul 24, 16:25 UTCJul 24, 17:05 UTC40m
2026-07-24 IWY0717 SVD → BGI Jul 24, 14:35 UTCJul 24, 15:15 UTC40m
2026-07-24 IWY0717 SVD → BGI Jul 24, 01:25 UTCJul 24, 02:00 UTC35m
2026-07-23 IWY0717 SVD → BGI Jul 23, 23:55 UTCJul 24, 00:20 UTC25m
2026-07-23 IWY0716 BGI → SVD Jul 23, 22:30 UTCJul 23, 22:50 UTC20m
2026-07-23 IWY0731 - Jul 23, 21:00 UTCJul 23, 21:35 UTC35m
2026-07-23 IWY0732 - Jul 23, 18:20 UTCJul 23, 19:00 UTC40m
2026-07-23 IWY0719 - Jul 23, 16:35 UTCJul 23, 17:10 UTC35m
2026-07-23 IWY0718 - Jul 23, 15:10 UTCJul 23, 15:40 UTC30m
2026-07-23 IWY0705 DOM → SLU Jul 23, 13:15 UTCJul 23, 13:35 UTC20m
2026-07-23 IWY0705 DOM → SLU Jul 23, 12:00 UTCJul 23, 12:10 UTC10m
2026-07-23 IWY2766 - Jul 23, 10:40 UTCJul 23, 11:10 UTC30m
2026-07-23 IWY743 SLU → BGI Jul 23, 00:50 UTCJul 23, 01:05 UTC15m
2026-07-22 IWY766 SLU → DOM Jul 22, 21:55 UTCJul 22, 22:30 UTC35m
2026-07-22 IWY749 - Jul 22, 20:20 UTCJul 22, 20:50 UTC30m
2026-07-22 IWY715 SLU → BGI Jul 22, 18:55 UTCJul 22, 19:25 UTC30m
2026-07-22 IWY715 SLU → BGI Jul 22, 17:40 UTCJul 22, 18:00 UTC20m
2026-07-22 IWY714 - Jul 22, 14:55 UTCJul 22, 15:20 UTC25m
2026-07-22 IWY707 - Jul 22, 13:15 UTCJul 22, 13:55 UTC40m
2026-07-22 IWY2768 - Jul 22, 11:45 UTCJul 22, 12:25 UTC40m
2026-07-22 IWY715 SLU → BGI Jul 22, 01:55 UTCJul 22, 02:20 UTC25m
2026-07-22 IWY766 SLU → DOM Jul 22, 00:40 UTCJul 22, 01:00 UTC20m
2026-07-21 IWY741 DOM → BGI Jul 21, 23:15 UTCJul 21, 23:35 UTC20m
2026-07-21 IWY740 BGI → DOM Jul 21, 21:25 UTCJul 21, 21:55 UTC30m
2026-07-21 IWY703 - Jul 21, 19:10 UTCJul 21, 19:45 UTC35m
2026-07-21 IWY2764 - Jul 21, 18:00 UTCJul 21, 18:10 UTC10m
2026-07-21 IWY716 - Jul 21, 15:50 UTCJul 21, 16:10 UTC20m
2026-07-21 IWY787 BGI → GEO Jul 21, 14:40 UTCJul 21, 14:55 UTC15m
2026-07-21 IWY788 - Jul 21, 00:20 UTCJul 21, 00:40 UTC20m
2026-07-20 IWY745 - Jul 20, 19:45 UTCJul 20, 20:05 UTC20m
2026-07-20 IWY744 - Jul 20, 18:30 UTCJul 20, 18:55 UTC25m
2026-07-20 IWY713 DOM → BGI Jul 20, 16:35 UTCJul 20, 16:55 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-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 Jul 26, 20:10 UTC.
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, IWY703, IWY715, IWY714.