Apparatus

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sensors Mode-S transponder

406D4D

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-VSPY · BOEING 787-9 Dreamliner

Hex
406D4D
Octal
20066515
Decimal
4,222,285
Country
GB
Tail
G-VSPY
Type
B789
Broadcasting now · callsign VIR42X · 39,000 ft
Flights observed
178
Distinct callsigns
20
Country
GB
Last broadcast
6h ago

Current position

406D4D is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 406D4D 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
VIR208 Virgin Atlantic Airways 13 2026-06-07
VIR142 - 13 2026-07-10
VIR141 - 12 2026-07-09
VIR209 Virgin Atlantic Airways 11 2026-06-08
VIR355 - 9 2026-07-05
VIR354 Virgin Atlantic Airways 9 2026-07-05
VIR156T - 8 2026-07-13
VIR155M - 8 2026-07-12
VIR26Q Virgin Atlantic Airways 7 2026-06-16
VIR12E - 7 2026-07-11
VIR316 Virgin Atlantic Airways 6 2026-06-02
VIR25B - 6 2026-06-15
VIR19Z Virgin Atlantic Airways 6 2026-05-12
VIR11B - 6 2026-07-10
VIR94 Virgin Atlantic Airways 5 2026-04-16
VIR450 Virgin Atlantic Airways 5 2026-06-09
VIR449 Virgin Atlantic Airways 5 2026-06-08
VIR42X - 5 2026-07-14
VIR41R - 5 2026-07-13
VIR317 Virgin Atlantic Airways 5 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 VIR42X - Jul 14, 07:45 UTCJul 14, 10:05 UTC2h 20m
2026-07-13 VIR41R - Jul 13, 18:10 UTCJul 14, 05:00 UTC10h 50m
2026-07-13 VIR156T LAS → LHR Jul 13, 05:20 UTCJul 13, 14:35 UTC9h 15m
2026-07-12 VIR155M - Jul 12, 17:15 UTCJul 13, 03:05 UTC9h 50m
2026-07-11 VIR412W - Jul 11, 22:10 UTCJul 12, 14:30 UTC16h 20m
2026-07-11 VIR12E BOS → LHR Jul 11, 03:40 UTCJul 11, 09:35 UTC5h 55m
2026-07-10 VIR11B - Jul 10, 18:40 UTCJul 11, 01:25 UTC6h 45m
2026-07-10 VIR142 - Jul 10, 03:45 UTCJul 10, 13:45 UTC10h 0m
2026-07-09 VIR141 - Jul 9, 13:50 UTCJul 10, 00:15 UTC10h 25m
2026-07-09 VIR12E BOS → LHR Jul 9, 03:45 UTCJul 9, 09:50 UTC6h 5m
2026-07-08 VIR11B - Jul 8, 18:15 UTCJul 9, 00:50 UTC6h 35m
2026-07-08 VIR156T LAS → LHR Jul 8, 05:05 UTCJul 8, 14:10 UTC9h 5m
2026-07-07 VIR155M LHR → LAS Jul 7, 16:55 UTCJul 8, 02:55 UTC10h 0m
2026-07-07 VIR142 - Jul 7, 04:10 UTCJul 7, 13:50 UTC9h 40m
2026-07-06 VIR141 - Jul 6, 13:50 UTCJul 7, 00:25 UTC10h 35m
2026-07-05 VIR355 - Jul 5, 13:40 UTCJul 5, 22:50 UTC9h 10m
2026-07-05 VIR354 LHR → BOM Jul 5, 09:00 UTCJul 5, 09:35 UTC35m
2026-07-05 VIR354 LHR → BOM Jul 5, 06:15 UTCJul 5, 06:45 UTC30m
2026-07-04 VIR354 LHR → BOM Jul 4, 20:05 UTCJul 5, 05:40 UTC9h 35m
2026-07-04 VIR355 - Jul 4, 06:25 UTCJul 4, 15:55 UTC9h 30m
2026-07-03 VIR354 LHR → BOM Jul 3, 19:10 UTCJul 4, 03:35 UTC8h 25m
2026-07-03 VIR355 - Jul 3, 08:35 UTCJul 3, 15:55 UTC7h 20m
2026-07-03 VIR355 - Jul 3, 06:25 UTCJul 3, 08:30 UTC2h 5m
2026-07-03 VIR354 LHR → BOM Jul 3, 03:15 UTCJul 3, 03:55 UTC40m
2026-07-02 VIR354 LHR → BOM Jul 2, 19:20 UTCJul 2, 23:35 UTC4h 15m
2026-07-02 VIR355 - Jul 2, 08:50 UTCJul 2, 16:00 UTC7h 10m
2026-07-02 VIR355 - Jul 2, 07:00 UTCJul 2, 07:25 UTC25m
2026-07-01 VIR354 LHR → BOM Jul 1, 20:00 UTCJul 2, 04:35 UTC8h 35m
2026-07-01 VIR42X - Jul 1, 06:30 UTCJul 1, 16:00 UTC9h 30m
2026-06-30 VIR41R - Jun 30, 17:55 UTCJul 1, 03:55 UTC10h 0m
2026-06-30 VIR142 - Jun 30, 03:50 UTCJun 30, 13:20 UTC9h 30m
2026-06-29 VIR141 - Jun 29, 13:54 UTCJun 30, 00:09 UTC10h 15m
2026-06-28 VIR355 - Jun 28, 06:20 UTCJun 28, 15:24 UTC9h 5m
2026-06-28 VIR354 LHR → BOM Jun 28, 03:14 UTCJun 28, 03:45 UTC30m
2026-06-27 VIR354 LHR → BOM Jun 27, 19:15 UTCJun 27, 23:39 UTC4h 25m
2026-06-27 VIR156T LAS → LHR Jun 27, 06:25 UTCJun 27, 15:45 UTC9h 20m
2026-06-26 VIR155M LHR → LAS Jun 26, 17:19 UTCJun 27, 03:15 UTC9h 55m
2026-06-26 VIR156T LAS → LHR Jun 26, 05:35 UTCJun 26, 14:59 UTC9h 25m
2026-06-25 VIR155M LHR → LAS Jun 25, 16:35 UTCJun 26, 02:20 UTC9h 45m
2026-06-23 VIR156T LAS → LHR Jun 23, 05:04 UTCJun 23, 14:29 UTC9h 25m
2026-06-22 VIR155M LHR → LAS Jun 22, 16:45 UTCJun 23, 02:40 UTC9h 55m
2026-06-22 VIR142 - Jun 22, 03:50 UTCJun 22, 13:19 UTC9h 30m
2026-06-21 VIR141 - Jun 21, 13:59 UTCJun 22, 00:24 UTC10h 25m
2026-06-21 VIR22Q IAD → LHR Jun 21, 04:04 UTCJun 21, 10:14 UTC6h 10m
2026-06-20 VIR21K - Jun 20, 18:40 UTCJun 21, 02:04 UTC7h 25m
2026-06-20 VIR42X SFO → LHR Jun 20, 06:39 UTCJun 20, 16:14 UTC9h 35m
2026-06-19 VIR41R LHR → SFO Jun 19, 17:55 UTCJun 20, 03:59 UTC10h 5m
2026-06-19 VIR142 LAX → LHR Jun 19, 03:44 UTCJun 19, 13:29 UTC9h 45m
2026-06-18 VIR141 - Jun 18, 14:05 UTCJun 19, 00:40 UTC10h 34m
2026-06-18 VIR12E BOS → LHR Jun 18, 03:30 UTCJun 18, 09:25 UTC5h 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 G-VSPY page for operator, model, and routing details .

Mode-S 406D4D frequently asked

What is Mode-S code 406D4D?
406D4D is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-VSPY.
Where is Mode-S 406D4D registered?
Mode-S code 406D4D 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 406D4D broadcasting right now?
Yes. Mode-S 406D4D is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 406D4D, octal 20066515, decimal 4,222,285.
What flights does 406D4D operate?
Mode-S 406D4D has broadcast 20 distinct callsigns, including VIR208, VIR142, VIR141, VIR209, VIR355.