Apparatus

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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 Jul 26, 22:30 UTC
Flights observed
213
Distinct callsigns
20
Country
GB
Last broadcast
Jul 26, 22:30 UTC

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
IWY775 Interisland Airways Limited 27 2026-07-26
IWY774 Interisland Airways Limited 26 2026-07-22
IWY751 Interisland Airways Limited 14 2026-07-25
IWY752 Interisland Airways Limited 13 2026-07-20
IWY781 Interisland Airways Limited 10 2026-07-21
IWY793 Interisland Airways Limited 7 2026-07-20
IWY792 - 7 2026-07-20
IWY784 - 7 2026-07-17
IWY783 - 7 2026-07-17
IWY745 Interisland Airways Limited 7 2026-07-26
IWY744 Interisland Airways Limited 7 2026-07-26
IWY798 Interisland Airways Limited 6 2026-05-01
IWY796 Interisland Airways Limited 5 2026-07-25
IWY791 Interisland Airways Limited 5 2026-05-02
IWY733 Interisland Airways Limited 5 2026-07-07
IWY732 Interisland Airways Limited 5 2026-07-07
IWY797 Interisland Airways Limited 4 2026-04-25
IWY782 - 4 2026-07-21
IWY748 Interisland Airways Limited 4 2026-07-26
IWY736 Interisland Airways Limited 4 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 IWY749 GND → BGI Jul 26, 22:10 UTCJul 26, 22:30 UTC20m
2026-07-26 IWY748 BGI → GND Jul 26, 21:05 UTCJul 26, 21:25 UTC20m
2026-07-26 IWY745 SVD → BGI Jul 26, 19:35 UTCJul 26, 19:55 UTC20m
2026-07-26 IWY744 BGI → SVD Jul 26, 18:25 UTCJul 26, 18:40 UTC15m
2026-07-26 IWY775 KIN → BGI Jul 26, 00:30 UTCJul 26, 17:25 UTC16h 56m
2026-07-25 IWY796 BGI → ANU Jul 25, 21:30 UTCJul 25, 23:40 UTC2h 10m
2026-07-25 IWY717 SVD → BGI Jul 25, 20:15 UTCJul 25, 20:35 UTC20m
2026-07-25 IWY716 BGI → SVD Jul 25, 19:15 UTCJul 25, 19:35 UTC20m
2026-07-25 IWY719 GND → BGI Jul 25, 17:50 UTCJul 25, 18:10 UTC20m
2026-07-25 IWY718 SVD → GND Jul 25, 16:20 UTCJul 25, 16:45 UTC25m
2026-07-25 IWY751 POS → BGI Jul 25, 14:30 UTCJul 25, 15:00 UTC30m
2026-07-25 IWY2752 - Jul 25, 12:40 UTCJul 25, 13:05 UTC25m
2026-07-25 IWY2764 - Jul 25, 02:45 UTCJul 25, 03:15 UTC30m
2026-07-25 IWY764 SVD → GND Jul 25, 01:15 UTCJul 25, 01:40 UTC25m
2026-07-24 IWY736 BGI → SKB Jul 24, 21:10 UTCJul 24, 23:50 UTC2h 40m
2026-07-24 IWY775 - Jul 24, 15:55 UTCJul 24, 17:35 UTC1h 40m
2026-07-23 IWY775 - Jul 23, 19:30 UTCJul 24, 17:35 UTC22h 5m
2026-07-22 IWY774 BGI → SDQ Jul 22, 00:35 UTCJul 22, 02:20 UTC1h 45m
2026-07-21 IWY782 - Jul 21, 22:25 UTCJul 21, 22:40 UTC15m
2026-07-21 IWY781 BGI → GEO Jul 21, 19:00 UTCJul 21, 19:45 UTC45m
2026-07-21 IWY781 BGI → GEO Jul 21, 18:05 UTCJul 21, 18:25 UTC20m
2026-07-21 IWY751 POS → BGI Jul 21, 16:25 UTCJul 21, 16:50 UTC25m
2026-07-21 IWY2752 - Jul 21, 13:40 UTCJul 21, 14:05 UTC25m
2026-07-21 IWY2751 - Jul 21, 00:00 UTCJul 21, 00:30 UTC30m
2026-07-20 IWY752 BGI → POS Jul 20, 22:15 UTCJul 20, 22:40 UTC25m
2026-07-20 IWY793 ANU → BGI Jul 20, 19:45 UTCJul 20, 20:00 UTC15m
2026-07-20 IWY792 - Jul 20, 17:45 UTCJul 20, 18:10 UTC25m
2026-07-20 IWY775 - Jul 20, 16:35 UTCJul 20, 16:45 UTC10m
2026-07-19 IWY774 BGI → SDQ Jul 19, 23:40 UTCJul 20, 15:10 UTC15h 30m
2026-07-19 IWY735 - Jul 19, 22:45 UTCJul 19, 22:55 UTC10m
2026-07-19 IWY734 BGI → SKB Jul 19, 20:25 UTCJul 19, 20:45 UTC20m
2026-07-19 IWY717 SVD → BGI Jul 19, 19:05 UTCJul 19, 19:25 UTC20m
2026-07-19 IWY716 - Jul 19, 18:15 UTCJul 19, 18:30 UTC15m
2026-07-19 IWY775 - Jul 19, 17:05 UTCJul 19, 17:15 UTC10m
2026-07-19 IWY774 BGI → SDQ Jul 19, 00:40 UTCJul 19, 15:35 UTC14h 55m
2026-07-18 IWY717 SVD → BGI Jul 18, 21:35 UTCJul 18, 21:55 UTC20m
2026-07-18 IWY716 - Jul 18, 20:00 UTCJul 18, 20:20 UTC20m
2026-07-18 IWY781 BGI → GEO Jul 18, 15:15 UTCJul 18, 18:25 UTC3h 10m
2026-07-18 IWY751 POS → BGI Jul 18, 13:55 UTCJul 18, 14:25 UTC30m
2026-07-18 IWY752 - Jul 18, 00:10 UTCJul 18, 00:35 UTC25m
2026-07-17 IWY784 - Jul 17, 23:05 UTCJul 17, 23:20 UTC15m
2026-07-17 IWY783 - Jul 17, 20:29 UTCJul 17, 20:50 UTC20m
2026-07-17 IWY745 - Jul 17, 19:20 UTCJul 17, 19:40 UTC20m
2026-07-17 IWY744 - Jul 17, 17:50 UTCJul 17, 18:05 UTC15m
2026-07-17 IWY775 - Jul 17, 16:40 UTCJul 17, 17:09 UTC30m
2026-07-16 IWY774 - Jul 16, 22:49 UTCJul 17, 15:15 UTC16h 25m
2026-07-16 IWY781 BGI → GEO Jul 16, 14:40 UTCJul 16, 17:30 UTC2h 50m
2026-07-16 IWY751 POS → BGI Jul 16, 13:20 UTCJul 16, 13:49 UTC30m
2026-07-16 IWY2752 - Jul 16, 11:50 UTCJul 16, 12:09 UTC20m
2026-07-16 IWY775 - Jul 16, 08:35 UTCJul 16, 08:45 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-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 Jul 26, 22:30 UTC.
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 IWY775, IWY774, IWY751, IWY752, IWY781.