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sensors Mode-S transponder

40039A

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to VQ-TAB · EMBRAER ERJ-145

Hex
40039A
Octal
20001632
Decimal
4,195,226
Country
GB
Tail
VQ-TAB
Type
E145
No current signal · last broadcast 1h ago
Flights observed
158
Distinct callsigns
20
Country
GB
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 40039A.

Country allocation

The ICAO 24-bit address 40039A 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
IWY774 - 22 2026-07-13
IWY775 - 20 2026-07-13
IWY752 - 10 2026-07-14
IWY751 Interisland Airways Limited 9 2026-07-11
IWY798 Interisland Airways Limited 6 2026-05-01
IWY793 - 6 2026-07-08
IWY792 - 6 2026-07-08
IWY784 - 6 2026-07-14
IWY783 - 6 2026-07-13
IWY791 Interisland Airways Limited 5 2026-05-02
IWY781 Interisland Airways Limited 5 2026-07-09
IWY745 - 5 2026-07-13
IWY744 - 5 2026-07-13
IWY733 Interisland Airways Limited 5 2026-07-07
IWY732 Interisland Airways Limited 5 2026-07-07
IWY797 Interisland Airways Limited 4 2026-04-25
IWY796 Interisland Airways Limited 4 2026-04-25
IWY748 - 3 2026-06-28
IWY737 - 3 2026-07-08
IWY736 Interisland Airways Limited 3 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 IWY752 - Jul 14, 02:15 UTCJul 14, 02:30 UTC15m
2026-07-14 IWY784 - Jul 14, 01:00 UTCJul 14, 01:15 UTC15m
2026-07-13 IWY783 - Jul 13, 22:15 UTCJul 13, 22:30 UTC15m
2026-07-13 IWY745 - Jul 13, 20:05 UTCJul 13, 20:25 UTC20m
2026-07-13 IWY744 - Jul 13, 18:50 UTCJul 13, 19:10 UTC20m
2026-07-13 IWY775 - Jul 13, 17:35 UTCJul 13, 17:45 UTC10m
2026-07-13 IWY774 - Jul 13, 00:35 UTCJul 13, 16:15 UTC15h 40m
2026-07-12 IWY745 - Jul 12, 23:20 UTCJul 12, 23:40 UTC20m
2026-07-12 IWY744 - Jul 12, 22:20 UTCJul 12, 22:35 UTC15m
2026-07-12 IWY735 - Jul 12, 21:20 UTCJul 12, 21:30 UTC10m
2026-07-12 IWY734 BGI → SKB Jul 12, 18:50 UTCJul 12, 19:10 UTC20m
2026-07-12 IWY775 - Jul 12, 16:05 UTCJul 12, 16:20 UTC15m
2026-07-11 IWY774 - Jul 11, 21:40 UTCJul 12, 14:45 UTC17h 5m
2026-07-11 IWY964 - Jul 11, 16:00 UTCJul 11, 20:35 UTC4h 35m
2026-07-11 IWY751 POS → BGI Jul 11, 14:15 UTCJul 11, 14:45 UTC30m
2026-07-11 IWY752 - Jul 11, 00:00 UTCJul 11, 00:25 UTC25m
2026-07-10 IWY784 - Jul 10, 22:05 UTCJul 10, 22:20 UTC15m
2026-07-10 IWY783 - Jul 10, 19:10 UTCJul 10, 19:35 UTC25m
2026-07-10 IWY775 - Jul 10, 16:35 UTCJul 10, 16:50 UTC15m
2026-07-09 IWY774 - Jul 9, 23:40 UTCJul 10, 15:15 UTC15h 35m
2026-07-09 IWY774 - Jul 9, 21:55 UTCJul 9, 22:10 UTC15m
2026-07-09 IWY781 BGI → GEO Jul 9, 17:20 UTCJul 9, 20:10 UTC2h 50m
2026-07-09 IWY703 - Jul 9, 15:25 UTCJul 9, 15:45 UTC20m
2026-07-09 IWY764 - Jul 9, 02:05 UTCJul 9, 02:15 UTC10m
2026-07-09 IWY764 - Jul 9, 01:00 UTCJul 9, 01:15 UTC15m
2026-07-08 IWY737 - Jul 8, 23:55 UTCJul 9, 00:05 UTC10m
2026-07-08 IWY736 BGI → SKB Jul 8, 21:00 UTCJul 8, 21:25 UTC25m
2026-07-08 IWY793 - Jul 8, 19:25 UTCJul 8, 19:45 UTC20m
2026-07-08 IWY792 - Jul 8, 17:00 UTCJul 8, 17:20 UTC20m
2026-07-08 IWY775 - Jul 8, 15:40 UTCJul 8, 15:55 UTC15m
2026-07-07 IWY774 - Jul 7, 21:00 UTCJul 7, 22:45 UTC1h 45m
2026-07-07 IWY733 SKB → BGI Jul 7, 19:50 UTCJul 7, 20:00 UTC10m
2026-07-07 IWY732 BGI → SKB Jul 7, 17:20 UTCJul 7, 17:45 UTC25m
2026-07-07 IWY751 POS → BGI Jul 7, 15:40 UTCJul 7, 16:05 UTC25m
2026-07-07 IWY752 - Jul 7, 02:05 UTCJul 7, 02:30 UTC25m
2026-07-07 IWY784 - Jul 7, 00:50 UTCJul 7, 01:15 UTC25m
2026-07-06 IWY783 - Jul 6, 22:10 UTCJul 6, 22:25 UTC15m
2026-07-06 IWY775 - Jul 6, 18:25 UTCJul 6, 18:40 UTC15m
2026-06-29 IWY752 - Jun 29, 22:15 UTCJun 29, 22:44 UTC30m
2026-06-29 IWY745 - Jun 29, 20:04 UTCJun 29, 20:24 UTC20m
2026-06-29 IWY744 - Jun 29, 18:55 UTCJun 29, 19:15 UTC20m
2026-06-29 IWY793 - Jun 29, 17:24 UTCJun 29, 17:45 UTC20m
2026-06-29 IWY792 - Jun 29, 15:00 UTCJun 29, 15:19 UTC20m
2026-06-29 IWY751 POS → BGI Jun 29, 13:09 UTCJun 29, 13:39 UTC30m
2026-06-28 IWY752 - Jun 28, 23:20 UTCJun 28, 23:44 UTC25m
2026-06-28 IWY745 - Jun 28, 22:04 UTCJun 28, 22:24 UTC20m
2026-06-28 IWY744 - Jun 28, 21:10 UTCJun 28, 21:24 UTC15m
2026-06-28 IWY749 - Jun 28, 19:40 UTCJun 28, 20:04 UTC25m
2026-06-28 IWY748 - Jun 28, 18:49 UTCJun 28, 19:09 UTC20m
2026-06-26 IWY774 - Jun 26, 00:24 UTCJun 26, 18:20 UTC17h 55m

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

Mode-S 40039A frequently asked

What is Mode-S code 40039A?
40039A is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to VQ-TAB.
Where is Mode-S 40039A registered?
Mode-S code 40039A 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 40039A broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 40039A, octal 20001632, decimal 4,195,226.
What flights does 40039A operate?
Mode-S 40039A has broadcast 20 distinct callsigns, including IWY774, IWY775, IWY752, IWY751, IWY798.