Apparatus

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sensors Mode-S transponder

40660C

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-FDZY · BOEING 737-800

Hex
40660C
Octal
20063014
Decimal
4,220,428
Country
GB
Tail
G-FDZY
Type
B738
No current signal · last broadcast Jul 26, 21:35 UTC
Flights observed
374
Distinct callsigns
20
Country
GB
Last broadcast
Jul 26, 21:35 UTC

Last known position

Most recent position reported by Mode-S 40660C.

Country allocation

The ICAO 24-bit address 40660C 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
TOM3TD TUI Airways 6 2026-06-22
TOM3BY TUI Airways 6 2026-06-24
TOM8KM TUI Airways 5 2026-06-22
TOM4ML - 5 2026-07-02
TOM21N - 5 2026-07-02
TOM9WD TUI Airways 4 2026-07-03
TOM90X TUI Airways 4 2026-07-25
TOM86B TUI Airways 4 2026-04-24
TOM83C - 4 2026-06-30
TOM7WN - 4 2026-06-30
TOM7PT - 4 2026-06-30
TOM7MA TUI Airways 4 2026-06-24
TOM7LX TUI Airways 4 2026-07-25
TOM7JD TUI Airways 4 2026-06-28
TOM7BH - 4 2026-07-02
TOM74G TUI Airways 4 2026-04-22
TOM73V TUI Airways 4 2026-06-24
TOM6LY TUI Airways 4 2026-07-25
TOM6EC TUI Airways 4 2026-07-24
TOM5LW - 4 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TOM6HG LGW → ZTH Jul 26, 16:35 UTCJul 26, 21:30 UTC4h 55m
2026-07-25 TOM6EY LPA → BRS Jul 25, 20:25 UTCJul 26, 00:30 UTC4h 5m
2026-07-25 TOM7LX AGP → BHX Jul 25, 16:55 UTCJul 25, 19:10 UTC2h 15m
2026-07-25 TOM90X NCL → REU Jul 25, 13:15 UTCJul 25, 15:10 UTC1h 55m
2026-07-25 TOM4PA EFL → STN Jul 25, 09:25 UTCJul 25, 11:15 UTC1h 50m
2026-07-25 TOM6LY MAN → VRN Jul 25, 06:05 UTCJul 25, 08:05 UTC2h 0m
2026-07-24 TOM5DB LGW → EFL Jul 24, 20:00 UTCJul 24, 23:15 UTC3h 15m
2026-07-24 TOM6EC CHQ → MAN Jul 24, 14:40 UTCJul 24, 17:25 UTC2h 45m
2026-07-24 TOM4JD BHX → RAK Jul 24, 09:50 UTCJul 24, 13:25 UTC3h 35m
2026-07-24 TOM1CK GLA → RHO Jul 24, 05:20 UTCJul 24, 07:50 UTC2h 30m
2026-07-23 TOM8HT STN → LPA Jul 23, 21:35 UTCJul 24, 01:15 UTC3h 40m
2026-07-23 TOM53T - Jul 23, 15:40 UTCJul 23, 19:45 UTC4h 5m
2026-07-23 TOM99Y - Jul 23, 10:25 UTCJul 23, 12:50 UTC2h 25m
2026-07-23 TOM53E NCL → PMI Jul 23, 06:20 UTCJul 23, 08:35 UTC2h 15m
2026-07-22 TOM1YW EXT → PMI Jul 22, 13:25 UTCJul 22, 18:15 UTC4h 50m
2026-07-22 TOM7KV - Jul 22, 10:20 UTCJul 22, 11:40 UTC1h 20m
2026-07-21 TOM2KV LGW → SKG Jul 21, 19:10 UTCJul 21, 21:35 UTC2h 25m
2026-07-21 TOM11X ACE → BHX Jul 21, 15:20 UTCJul 21, 17:45 UTC2h 25m
2026-07-21 TOM2HB - Jul 21, 10:55 UTCJul 21, 13:40 UTC2h 45m
2026-07-21 TOM31H NCL → PMI Jul 21, 06:00 UTCJul 21, 08:20 UTC2h 20m
2026-07-20 TOM311 AGA → NCL Jul 20, 21:25 UTCJul 21, 00:30 UTC3h 4m
2026-07-20 TOM67N BOJ → MAN Jul 20, 16:10 UTCJul 20, 19:40 UTC3h 30m
2026-07-20 TOM61K - Jul 20, 10:55 UTCJul 20, 14:25 UTC3h 30m
2026-07-20 TOM71C SSH → BRS Jul 20, 06:25 UTCJul 20, 09:25 UTC3h 0m
2026-07-19 TOM4YT HER → DUB Jul 19, 20:40 UTCJul 20, 01:15 UTC4h 35m
2026-07-19 TOM1WY RHO → LGW Jul 19, 15:05 UTCJul 19, 19:15 UTC4h 10m
2026-07-19 TOM4AM MAN → HER Jul 19, 11:00 UTCJul 19, 13:25 UTC2h 25m
2026-07-19 TOM2NG NCL → LCA Jul 19, 07:05 UTCJul 19, 09:25 UTC2h 20m
2026-07-18 TOM7LX AGP → BHX Jul 18, 16:40 UTCJul 18, 18:50 UTC2h 10m
2026-07-18 TOM90X NCL → REU Jul 18, 13:15 UTCJul 18, 15:15 UTC2h 0m
2026-07-18 TOM4PA EFL → STN Jul 18, 09:15 UTCJul 18, 11:15 UTC2h 0m
2026-07-18 TOM6LY MAN → VRN Jul 18, 06:10 UTCJul 18, 07:55 UTC1h 45m
2026-07-17 TOM5DB LGW → EFL Jul 17, 21:00 UTCJul 18, 00:04 UTC3h 5m
2026-07-17 TOM6EC CHQ → MAN Jul 17, 15:55 UTCJul 17, 18:44 UTC2h 50m
2026-07-17 TOM4JD BHX → RAK Jul 17, 10:15 UTCJul 17, 13:29 UTC3h 15m
2026-07-17 TOM1CK GLA → RHO Jul 17, 05:10 UTCJul 17, 07:55 UTC2h 45m
2026-07-16 TOM8HT STN → LPA Jul 16, 21:19 UTCJul 17, 00:55 UTC3h 35m
2026-07-16 TOM53T - Jul 16, 15:05 UTCJul 16, 19:10 UTC4h 5m
2026-07-16 TOM99Y - Jul 16, 10:59 UTCJul 16, 13:30 UTC2h 30m
2026-07-16 TOM53E - Jul 16, 06:15 UTCJul 16, 08:45 UTC2h 30m
2026-07-15 TOM5TD - Jul 15, 20:35 UTCJul 16, 00:20 UTC3h 45m
2026-07-15 TOM10V - Jul 15, 14:55 UTCJul 15, 19:05 UTC4h 10m
2026-07-15 TOM8VB - Jul 15, 11:05 UTCJul 15, 13:25 UTC2h 20m
2026-07-15 TOM5LN - Jul 15, 07:20 UTCJul 15, 09:20 UTC2h 0m
2026-07-14 TOM2KV - Jul 14, 18:25 UTCJul 14, 20:45 UTC2h 20m
2026-07-14 TOM11X - Jul 14, 14:25 UTCJul 14, 16:55 UTC2h 30m
2026-07-14 TOM2HB - Jul 14, 10:25 UTCJul 14, 13:00 UTC2h 35m
2026-07-14 TOM31H - Jul 14, 05:55 UTCJul 14, 08:40 UTC2h 45m
2026-07-13 TOM67N NCL → NCL Jul 13, 16:40 UTCJul 14, 00:55 UTC8h 15m
2026-07-13 TOM61K - Jul 13, 11:30 UTCJul 13, 15:10 UTC3h 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-FDZY page for operator, model, and routing details .

Mode-S 40660C frequently asked

What is Mode-S code 40660C?
40660C is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-FDZY.
Where is Mode-S 40660C registered?
Mode-S code 40660C 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 40660C broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 40660C, octal 20063014, decimal 4,220,428.
What flights does 40660C operate?
Mode-S 40660C has broadcast 20 distinct callsigns, including TOM3TD, TOM3BY, TOM8KM, TOM4ML, TOM21N.