Apparatus

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sensors Mode-S transponder

40771A

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-VDOT · AIRBUS A-350-1000

Hex
40771A
Octal
20073432
Decimal
4,224,794
Country
GB
Tail
G-VDOT
Type
A35K
Broadcasting now · callsign VIR20V · 37,000 ft
Flights observed
188
Distinct callsigns
20
Country
GB
Last broadcast
1h ago

Current position

40771A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 40771A 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
VIR8Y - 20 2026-07-12
VIR7B - 19 2026-07-12
VIR104L - 18 2026-07-16
VIR103M - 18 2026-07-16
VIR153 - 16 2026-07-16
VIR154 - 13 2026-07-16
VIR20V - 10 2026-07-18
VIR19Z - 9 2026-07-17
VIR45W - 8 2026-07-01
VIR10H Virgin Atlantic Airways 6 2026-06-07
VIR46K - 5 2026-07-01
VIR118 Virgin Atlantic Airways 5 2026-04-17
VIR9J - 4 2026-07-03
VIR4C - 4 2026-07-04
VIR302 - 4 2026-07-08
VIR157L - 4 2026-07-10
VIR138M - 4 2026-07-15
VIR137Y - 4 2026-07-14
VIR117F Virgin Atlantic Airways 4 2026-04-16
VIR58N - 3 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 VIR20V - Jul 18, 01:20 UTCJul 18, 02:29 UTC1h 10m
2026-07-17 VIR19Z LHR → SFO Jul 17, 12:15 UTCJul 17, 22:45 UTC10h 30m
2026-07-16 VIR104L ATL → LHR Jul 16, 23:44 UTCJul 17, 07:30 UTC7h 45m
2026-07-16 VIR103M - Jul 16, 12:09 UTCJul 16, 20:09 UTC8h 0m
2026-07-16 VIR154 JFK → LHR Jul 16, 03:30 UTCJul 16, 09:50 UTC6h 20m
2026-07-16 VIR153 - Jul 16, 00:15 UTCJul 16, 00:55 UTC40m
2026-07-15 VIR153 - Jul 15, 15:10 UTCJul 15, 22:15 UTC7h 5m
2026-07-15 VIR138M JFK → LHR Jul 15, 05:45 UTCJul 15, 12:05 UTC6h 20m
2026-07-14 VIR137Y LHR → JFK Jul 14, 18:00 UTCJul 15, 00:45 UTC6h 44m
2026-07-14 VIR20V SFO → LHR Jul 14, 01:15 UTCJul 14, 10:40 UTC9h 25m
2026-07-13 VIR19Z - Jul 13, 12:10 UTCJul 13, 22:40 UTC10h 30m
2026-07-12 VIR8Y LAX → LHR Jul 12, 23:00 UTCJul 13, 08:45 UTC9h 45m
2026-07-12 VIR7B LHR → LAX Jul 12, 09:15 UTCJul 12, 19:45 UTC10h 30m
2026-07-11 VIR104L ATL → LHR Jul 11, 23:15 UTCJul 12, 06:35 UTC7h 20m
2026-07-11 VIR103M LHR → ATL Jul 11, 11:10 UTCJul 11, 20:10 UTC9h 0m
2026-07-11 VIR58N BOS → LHR Jul 11, 01:50 UTCJul 11, 07:50 UTC6h 0m
2026-07-10 VIR157L LHR → BOS Jul 10, 15:35 UTCJul 10, 22:20 UTC6h 45m
2026-07-09 VIR8Y LAX → LHR Jul 9, 23:00 UTCJul 10, 08:35 UTC9h 35m
2026-07-09 VIR7B LHR → LAX Jul 9, 09:15 UTCJul 9, 19:45 UTC10h 30m
2026-07-08 VIR303 - Jul 8, 21:25 UTCJul 9, 06:00 UTC8h 35m
2026-07-08 VIR302 - Jul 8, 16:40 UTCJul 8, 17:40 UTC1h 0m
2026-07-08 VIR302 - Jul 8, 10:05 UTCJul 8, 14:30 UTC4h 25m
2026-07-07 VIR20V - Jul 7, 01:40 UTCJul 7, 11:00 UTC9h 20m
2026-07-06 VIR19Z - Jul 6, 12:40 UTCJul 6, 23:15 UTC10h 35m
2026-07-06 VIR8Y LAX → LHR Jul 6, 00:30 UTCJul 6, 10:10 UTC9h 40m
2026-07-05 VIR7B - Jul 5, 09:25 UTCJul 5, 19:50 UTC10h 25m
2026-07-04 VIR4C JFK → LHR Jul 4, 22:50 UTCJul 5, 05:10 UTC6h 20m
2026-07-04 VIR3N - Jul 4, 08:10 UTCJul 4, 15:15 UTC7h 5m
2026-07-03 VIR4C JFK → LHR Jul 3, 22:35 UTCJul 4, 05:05 UTC6h 30m
2026-07-03 VIR9J - Jul 3, 11:00 UTCJul 3, 18:05 UTC7h 5m
2026-07-02 VIR8Y - Jul 2, 22:55 UTCJul 3, 08:20 UTC9h 25m
2026-07-02 VIR7B - Jul 2, 09:20 UTCJul 2, 20:00 UTC10h 40m
2026-07-01 VIR46K JFK → LHR Jul 1, 23:50 UTCJul 2, 05:50 UTC6h 0m
2026-07-01 VIR45W - Jul 1, 11:10 UTCJul 1, 18:10 UTC7h 0m
2026-06-30 VIR303 - Jun 30, 21:10 UTCJul 1, 05:40 UTC8h 30m
2026-06-30 VIR302 - Jun 30, 10:10 UTCJun 30, 18:05 UTC7h 55m
2026-06-30 VIR46K JFK → LHR Jun 30, 00:09 UTCJun 30, 06:10 UTC6h 1m
2026-06-29 VIR45W - Jun 29, 12:09 UTCJun 29, 18:55 UTC6h 45m
2026-06-28 VIR104L ATL → LHR Jun 28, 22:45 UTCJun 29, 05:59 UTC7h 15m
2026-06-28 VIR103M - Jun 28, 10:39 UTCJun 28, 18:49 UTC8h 10m
2026-06-28 VIR154 JFK → LHR Jun 28, 01:04 UTCJun 28, 07:09 UTC6h 5m
2026-06-27 VIR153 LHR → JFK Jun 27, 15:34 UTCJun 27, 22:09 UTC6h 35m
2026-06-27 VIR138M JFK → LHR Jun 27, 04:05 UTCJun 27, 10:10 UTC6h 5m
2026-06-26 VIR137Y LHR → JFK Jun 26, 18:04 UTCJun 27, 00:50 UTC6h 45m
2026-06-26 VIR138M JFK → LHR Jun 26, 04:00 UTCJun 26, 09:59 UTC6h 0m
2026-06-25 VIR137Y LHR → JFK Jun 25, 17:54 UTCJun 26, 01:05 UTC7h 10m
2026-06-25 VIR20V - Jun 25, 09:20 UTCJun 25, 10:55 UTC1h 35m
2026-06-25 VIR20V - Jun 25, 01:14 UTCJun 25, 04:25 UTC3h 10m
2026-06-24 VIR19Z - Jun 24, 12:09 UTCJun 24, 22:14 UTC10h 5m
2026-06-23 VIR8Y - Jun 23, 23:00 UTCJun 24, 08:39 UTC9h 40m

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

Mode-S 40771A frequently asked

What is Mode-S code 40771A?
40771A is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-VDOT.
Where is Mode-S 40771A registered?
Mode-S code 40771A 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 40771A broadcasting right now?
Yes. Mode-S 40771A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 40771A, octal 20073432, decimal 4,224,794.
What flights does 40771A operate?
Mode-S 40771A has broadcast 20 distinct callsigns, including VIR8Y, VIR7B, VIR104L, VIR103M, VIR153.