Apparatus

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sensors Mode-S transponder

4003AD

ICAO 24-bit transponder address · allocated to United Kingdom

Hex
4003AD
Octal
20001655
Decimal
4,195,245
Country
GB
No current signal · last broadcast Jul 26, 20:05 UTC
Flights observed
313
Distinct callsigns
20
Country
GB
Last broadcast
Jul 26, 20:05 UTC

Last known position

Most recent position reported by Mode-S 4003AD.

Country allocation

The ICAO 24-bit address 4003AD 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
IWY510 Interisland Airways Limited 45 2026-07-26
IWY511 Interisland Airways Limited 42 2026-07-26
IWY509 Interisland Airways Limited 41 2026-07-26
IWY512 Interisland Airways Limited 39 2026-07-24
IWY513 Interisland Airways Limited 25 2026-07-24
IWY508 - 24 2026-07-26
IWY411 Interisland Airways Limited 17 2026-07-24
IWY410 Interisland Airways Limited 16 2026-07-12
IWY644 Interisland Airways Limited 15 2026-07-06
IWY643 - 13 2026-07-05
IWY764 Interisland Airways Limited 5 2026-05-05
IWY703 Interisland Airways Limited 5 2026-05-06
IWY715 Interisland Airways Limited 4 2026-05-06
IWY742 Interisland Airways Limited 3 2026-05-06
IWY714 Interisland Airways Limited 3 2026-05-06
IWY995 - 1 2026-06-19
IWY784 Interisland Airways Limited 1 2026-07-22
IWY783 Interisland Airways Limited 1 2026-07-22
IWY782 - 1 2026-07-23
IWY781 Interisland Airways Limited 1 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 IWY511 SJU → EIS Jul 26, 19:50 UTCJul 26, 20:05 UTC15m
2026-07-26 IWY510 EIS → SJU Jul 26, 17:55 UTCJul 26, 18:10 UTC15m
2026-07-26 IWY509 SJU → EIS Jul 26, 16:30 UTCJul 26, 16:45 UTC15m
2026-07-26 IWY508 - Jul 26, 15:00 UTCJul 26, 15:20 UTC20m
2026-07-25 IWY511 SJU → EIS Jul 25, 18:20 UTCJul 25, 18:35 UTC15m
2026-07-25 IWY510 - Jul 25, 16:25 UTCJul 25, 16:35 UTC10m
2026-07-25 IWY509 SJU → EIS Jul 25, 15:00 UTCJul 25, 15:20 UTC20m
2026-07-25 IWY508 - Jul 25, 13:15 UTCJul 25, 13:30 UTC15m
2026-07-25 IWY515 SJU → EIS Jul 25, 02:00 UTCJul 25, 02:15 UTC15m
2026-07-25 IWY514 EIS → SJU Jul 25, 00:45 UTCJul 25, 01:00 UTC15m
2026-07-24 IWY513 SJU → EIS Jul 24, 23:25 UTCJul 24, 23:45 UTC20m
2026-07-24 IWY512 EIS → SJU Jul 24, 21:55 UTCJul 24, 22:10 UTC15m
2026-07-24 IWY411 SDQ → EIS Jul 24, 20:25 UTCJul 24, 20:50 UTC25m
2026-07-23 IWY774 BGI → SDQ Jul 23, 22:05 UTCJul 23, 22:30 UTC25m
2026-07-23 IWY782 - Jul 23, 20:50 UTCJul 23, 21:10 UTC20m
2026-07-23 IWY781 BGI → GEO Jul 23, 16:45 UTCJul 23, 17:10 UTC25m
2026-07-23 IWY751 POS → BGI Jul 23, 15:05 UTCJul 23, 15:45 UTC40m
2026-07-23 IWY752 BGI → POS Jul 23, 01:45 UTCJul 23, 02:20 UTC35m
2026-07-22 IWY784 GEO → BGI Jul 22, 23:25 UTCJul 22, 23:45 UTC20m
2026-07-22 IWY783 BGI → GEO Jul 22, 19:25 UTCJul 22, 19:45 UTC20m
2026-07-22 IWY775 - Jul 22, 17:40 UTCJul 22, 18:25 UTC45m
2026-07-13 IWY509 SJU → EIS Jul 13, 14:45 UTCJul 13, 15:00 UTC15m
2026-07-12 IWY512 - Jul 12, 21:20 UTCJul 12, 21:35 UTC15m
2026-07-12 IWY411 - Jul 12, 19:20 UTCJul 12, 19:45 UTC25m
2026-07-12 IWY410 EIS → SDQ Jul 12, 16:20 UTCJul 12, 16:50 UTC30m
2026-07-11 IWY411 - Jul 11, 20:40 UTCJul 11, 21:05 UTC25m
2026-07-11 IWY410 EIS → SDQ Jul 11, 17:40 UTCJul 11, 18:05 UTC25m
2026-07-11 IWY508 - Jul 11, 15:10 UTCJul 11, 15:30 UTC20m
2026-07-11 IWY508 - Jul 11, 13:40 UTCJul 11, 13:50 UTC10m
2026-07-10 IWY513 - Jul 10, 21:30 UTCJul 10, 21:50 UTC20m
2026-07-10 IWY512 - Jul 10, 19:35 UTCJul 10, 19:55 UTC20m
2026-07-10 IWY511 - Jul 10, 17:40 UTCJul 10, 18:00 UTC20m
2026-07-10 IWY510 - Jul 10, 16:20 UTCJul 10, 16:40 UTC20m
2026-07-09 IWY411 - Jul 9, 20:15 UTCJul 9, 20:40 UTC25m
2026-07-09 IWY410 EIS → SDQ Jul 9, 16:00 UTCJul 9, 16:30 UTC30m
2026-07-09 IWY509 SJU → EIS Jul 9, 14:25 UTCJul 9, 14:40 UTC15m
2026-07-09 IWY508 - Jul 9, 13:10 UTCJul 9, 13:20 UTC10m
2026-07-08 IWY513 - Jul 8, 21:15 UTCJul 8, 21:30 UTC15m
2026-07-08 IWY512 - Jul 8, 20:10 UTCJul 8, 20:25 UTC15m
2026-07-08 IWY509 SJU → EIS Jul 8, 15:00 UTCJul 8, 15:15 UTC15m
2026-07-08 IWY508 - Jul 8, 13:25 UTCJul 8, 14:00 UTC35m
2026-07-07 IWY513 - Jul 7, 22:15 UTCJul 7, 22:35 UTC20m
2026-07-07 IWY512 - Jul 7, 20:50 UTCJul 7, 21:10 UTC20m
2026-07-07 IWY511 - Jul 7, 17:25 UTCJul 7, 17:45 UTC20m
2026-07-07 IWY510 - Jul 7, 15:50 UTCJul 7, 16:10 UTC20m
2026-07-06 IWY511 - Jul 6, 17:50 UTCJul 6, 18:10 UTC20m
2026-07-06 IWY510 - Jul 6, 16:20 UTCJul 6, 16:35 UTC15m
2026-07-06 IWY509 SJU → EIS Jul 6, 14:25 UTCJul 6, 14:40 UTC15m
2026-07-06 IWY644 SKB → SJU Jul 6, 13:05 UTCJul 6, 13:25 UTC20m
2026-07-05 IWY643 - Jul 5, 21:20 UTCJul 5, 21:45 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.

Mode-S 4003AD frequently asked

What is Mode-S code 4003AD?
4003AD is an ICAO 24-bit transponder address. Allocated to United Kingdom.
Where is Mode-S 4003AD registered?
Mode-S code 4003AD 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 4003AD broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4003AD, octal 20001655, decimal 4,195,245.
What flights does 4003AD operate?
Mode-S 4003AD has broadcast 20 distinct callsigns, including IWY510, IWY511, IWY509, IWY512, IWY513.