Apparatus

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sensors Mode-S transponder

4003A7

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to VQ-TKN

Hex
4003A7
Octal
20001647
Decimal
4,195,239
Country
GB
Tail
VQ-TKN
Type
AT45
No current signal · last broadcast Jul 26, 21:20 UTC
Flights observed
164
Distinct callsigns
20
Country
GB
Last broadcast
Jul 26, 21:20 UTC

Last known position

Most recent position reported by Mode-S 4003A7.

Country allocation

The ICAO 24-bit address 4003A7 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
IWY764 Interisland Airways Limited 22 2026-07-26
IWY703 - 19 2026-07-26
IWY742 Interisland Airways Limited 15 2026-07-26
IWY743 Interisland Airways Limited 14 2026-07-25
IWY705 - 8 2026-07-24
IWY766 Interisland Airways Limited 7 2026-07-23
IWY715 - 7 2026-07-18
IWY714 - 7 2026-07-18
IWY718 Interisland Airways Limited 6 2026-05-05
IWY557 Interisland Airways Limited 5 2026-07-22
IWY554 Interisland Airways Limited 5 2026-07-23
IWY719 Interisland Airways Limited 4 2026-05-05
IWY712 Interisland Airways Limited 4 2026-07-26
IWY556 - 4 2026-07-22
IWY788 Interisland Airways Limited 3 2026-07-25
IWY787 Interisland Airways Limited 3 2026-07-25
IWY749 - 3 2026-07-17
IWY555 Interisland Airways Limited 3 2026-07-23
IWY748 - 2 2026-07-17
IWY745 Interisland Airways Limited 2 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 IWY742 BGI → SLU Jul 26, 21:10 UTCJul 26, 21:20 UTC10m
2026-07-26 IWY713 DOM → BGI Jul 26, 17:40 UTCJul 26, 18:15 UTC35m
2026-07-26 IWY712 BGI → DOM Jul 26, 16:00 UTCJul 26, 16:35 UTC35m
2026-07-26 IWY703 - Jul 26, 14:15 UTCJul 26, 14:40 UTC25m
2026-07-26 IWY703 - Jul 26, 13:20 UTCJul 26, 13:30 UTC10m
2026-07-26 IWY764 SVD → GND Jul 26, 00:50 UTCJul 26, 01:00 UTC10m
2026-07-25 IWY764 SVD → GND Jul 25, 23:40 UTCJul 26, 00:05 UTC25m
2026-07-25 IWY743 SLU → BGI Jul 25, 22:10 UTCJul 25, 22:45 UTC35m
2026-07-25 IWY742 BGI → SLU Jul 25, 19:40 UTCJul 25, 19:55 UTC15m
2026-07-25 IWY787 BGI → GEO Jul 25, 17:50 UTCJul 25, 18:10 UTC20m
2026-07-25 IWY788 BGI → OGL Jul 25, 03:20 UTCJul 25, 03:35 UTC15m
2026-07-25 IWY784 GEO → BGI Jul 25, 02:00 UTCJul 25, 02:15 UTC15m
2026-07-24 IWY783 BGI → GEO Jul 24, 21:45 UTCJul 24, 22:05 UTC20m
2026-07-24 IWY713 DOM → BGI Jul 24, 18:25 UTCJul 24, 19:10 UTC45m
2026-07-24 IWY712 BGI → DOM Jul 24, 16:55 UTCJul 24, 17:05 UTC10m
2026-07-24 IWY712 BGI → DOM Jul 24, 15:40 UTCJul 24, 15:55 UTC15m
2026-07-24 IWY705 - Jul 24, 14:15 UTCJul 24, 14:25 UTC10m
2026-07-23 IWY766 SLU → DOM Jul 23, 23:55 UTCJul 24, 00:10 UTC15m
2026-07-23 IWY555 SXM → BGI Jul 23, 22:20 UTCJul 23, 22:55 UTC35m
2026-07-23 IWY554 BGI → EIS Jul 23, 17:15 UTCJul 23, 17:50 UTC35m
2026-07-23 IWY703 - Jul 23, 15:20 UTCJul 23, 15:50 UTC30m
2026-07-23 IWY764 SVD → GND Jul 23, 02:15 UTCJul 23, 02:25 UTC10m
2026-07-23 IWY764 SVD → GND Jul 23, 01:10 UTCJul 23, 01:30 UTC20m
2026-07-22 IWY557 EIS → BGI Jul 22, 23:30 UTCJul 23, 00:05 UTC35m
2026-07-22 IWY556 - Jul 22, 17:00 UTCJul 22, 17:45 UTC45m
2026-07-22 IWY703 - Jul 22, 14:50 UTCJul 22, 15:15 UTC25m
2026-07-22 IWY764 SVD → GND Jul 22, 01:55 UTCJul 22, 02:05 UTC10m
2026-07-22 IWY764 SVD → GND Jul 22, 01:00 UTCJul 22, 01:20 UTC20m
2026-07-21 IWY743 SLU → BGI Jul 21, 23:15 UTCJul 21, 23:30 UTC15m
2026-07-21 IWY742 - Jul 21, 21:50 UTCJul 21, 22:05 UTC15m
2026-07-21 IWY733 - Jul 21, 19:25 UTCJul 21, 19:40 UTC15m
2026-07-21 IWY732 - Jul 21, 16:15 UTCJul 21, 16:35 UTC20m
2026-07-21 IWY705 - Jul 21, 14:50 UTCJul 21, 15:00 UTC10m
2026-07-20 IWY766 SLU → DOM Jul 20, 23:55 UTCJul 21, 00:05 UTC10m
2026-07-20 IWY743 SLU → BGI Jul 20, 22:30 UTCJul 20, 22:50 UTC20m
2026-07-20 IWY742 - Jul 20, 21:15 UTCJul 20, 21:30 UTC15m
2026-07-20 IWY557 - Jul 20, 20:20 UTCJul 20, 20:30 UTC10m
2026-07-20 IWY554 BGI → EIS Jul 20, 16:00 UTCJul 20, 16:10 UTC10m
2026-07-20 IWY703 - Jul 20, 14:10 UTCJul 20, 14:35 UTC25m
2026-07-20 IWY703 - Jul 20, 13:15 UTCJul 20, 13:25 UTC10m
2026-07-20 IWY764 - Jul 20, 00:10 UTCJul 20, 00:20 UTC10m
2026-07-19 IWY764 - Jul 19, 22:55 UTCJul 19, 23:20 UTC25m
2026-07-19 IWY557 - Jul 19, 21:15 UTCJul 19, 21:25 UTC10m
2026-07-19 IWY556 - Jul 19, 15:40 UTCJul 19, 16:00 UTC20m
2026-07-19 IWY707 - Jul 19, 13:35 UTCJul 19, 13:55 UTC20m
2026-07-18 IWY768 BGI → DOM Jul 18, 23:10 UTCJul 18, 23:35 UTC25m
2026-07-18 IWY743 SLU → BGI Jul 18, 20:55 UTCJul 18, 21:10 UTC15m
2026-07-18 IWY742 - Jul 18, 19:30 UTCJul 18, 19:40 UTC10m
2026-07-18 IWY715 - Jul 18, 17:10 UTCJul 18, 17:25 UTC15m
2026-07-18 IWY714 - Jul 18, 15:50 UTCJul 18, 16:00 UTC10m

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

Mode-S 4003A7 frequently asked

What is Mode-S code 4003A7?
4003A7 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to VQ-TKN.
Where is Mode-S 4003A7 registered?
Mode-S code 4003A7 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 4003A7 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4003A7, octal 20001647, decimal 4,195,239.
What flights does 4003A7 operate?
Mode-S 4003A7 has broadcast 20 distinct callsigns, including IWY764, IWY703, IWY742, IWY743, IWY705.