Apparatus

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sensors Mode-S transponder

405E23

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-FDZR · BOEING 737-800

Hex
405E23
Octal
20057043
Decimal
4,218,403
Country
GB
Tail
G-FDZR
Type
B738
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
362
Distinct callsigns
20
Country
GB
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S 405E23.

Country allocation

The ICAO 24-bit address 405E23 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
TOM4KE - 6 2026-07-13
TOM793 - 5 2026-07-06
TOM792 TUI Airways 5 2026-07-06
TOM74G TUI Airways 5 2026-05-27
TOM62H TUI Airways 5 2026-07-06
TOM5JW TUI Airways 5 2026-05-27
TOM8GB - 4 2026-07-12
TOM89E TUI Airways 4 2026-05-19
TOM86B TUI Airways 4 2026-05-22
TOM84L - 4 2026-07-12
TOM81T TUI Airways 4 2026-05-30
TOM7MH - 4 2026-07-08
TOM6MY - 4 2026-07-09
TOM6KH TUI Airways 4 2026-05-23
TOM6EK - 4 2026-07-08
TOM6AT - 4 2026-07-12
TOM676 TUI Airways 4 2026-05-25
TOM5MV - 4 2026-07-12
TOM4XV - 4 2026-07-03
TOM4PV TUI Airways 4 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TOM1YC LGW → BOJ Jul 26, 21:25 UTCJul 26, 22:45 UTC1h 20m
2026-07-26 TOM2VM GLA → PFO Jul 26, 15:40 UTCJul 26, 19:55 UTC4h 15m
2026-07-26 TOM905P MAN → BOH Jul 26, 11:00 UTCJul 26, 12:10 UTC1h 10m
2026-07-25 TOM1VK IBZ → BHX Jul 25, 18:25 UTCJul 25, 22:00 UTC3h 35m
2026-07-25 TOM6PG ADB → MAN Jul 25, 13:05 UTCJul 25, 16:25 UTC3h 20m
2026-07-25 TOM5LT IBZ → LGW Jul 25, 09:00 UTCJul 25, 11:05 UTC2h 5m
2026-07-25 TOM71V ZTH → BHX Jul 25, 05:00 UTCJul 25, 07:05 UTC2h 5m
2026-07-24 TOM40Y STN → STN Jul 24, 13:35 UTCJul 24, 22:25 UTC8h 50m
2026-07-24 TOM11G CWL → EFL Jul 24, 09:10 UTCJul 24, 11:25 UTC2h 15m
2026-07-24 TOM50V IBZ → LGW Jul 24, 05:30 UTCJul 24, 07:55 UTC2h 25m
2026-07-23 TOM553 DLM → DSA Jul 23, 20:40 UTCJul 24, 01:35 UTC4h 55m
2026-07-23 TOM552 - Jul 23, 14:35 UTCJul 23, 18:45 UTC4h 10m
2026-07-23 TOM1BC BOH → TFS Jul 23, 09:35 UTCJul 23, 11:50 UTC2h 15m
2026-07-23 TOM9HM VRN → MAN Jul 23, 05:25 UTCJul 23, 07:50 UTC2h 25m
2026-07-22 TOM84K - Jul 22, 21:55 UTCJul 23, 01:45 UTC3h 50m
2026-07-22 TOM2NM LGW → KGS Jul 22, 17:20 UTCJul 22, 20:35 UTC3h 15m
2026-07-22 TOM74K IBZ → CWL Jul 22, 11:50 UTCJul 22, 15:25 UTC3h 35m
2026-07-21 TOM2JV PMI → NCL Jul 21, 21:05 UTCJul 22, 00:30 UTC3h 25m
2026-07-21 TOM2DC - Jul 21, 15:55 UTCJul 21, 19:40 UTC3h 45m
2026-07-21 TOM92W ZTH → LGW Jul 21, 10:45 UTCJul 21, 14:10 UTC3h 25m
2026-07-21 TOM9YL LGW → ZTH Jul 21, 06:35 UTCJul 21, 09:30 UTC2h 55m
2026-07-20 TOM5175 - Jul 20, 20:35 UTCJul 21, 00:10 UTC3h 35m
2026-07-20 TOM5174 LGW → TFS Jul 20, 15:00 UTCJul 20, 18:45 UTC3h 45m
2026-07-20 TOM1GY - Jul 20, 10:10 UTCJul 20, 13:05 UTC2h 55m
2026-07-20 TOM9NY LGW → CFU Jul 20, 05:35 UTCJul 20, 07:50 UTC2h 15m
2026-07-19 TOM9GX - Jul 19, 17:50 UTCJul 19, 19:45 UTC1h 55m
2026-07-19 TOM4KB - Jul 19, 14:10 UTCJul 19, 16:05 UTC1h 55m
2026-07-19 TOM6PE BHX → ZTH Jul 19, 09:05 UTCJul 19, 11:05 UTC2h 0m
2026-07-19 TOM9TG PFO → NCL Jul 19, 05:40 UTCJul 19, 07:40 UTC2h 0m
2026-07-18 TOM77K ZTH → EMA Jul 18, 23:30 UTCJul 19, 04:00 UTC4h 30m
2026-07-18 TOM78V HRG → BHX Jul 18, 18:15 UTCJul 18, 22:10 UTC3h 55m
2026-07-18 TOM84B - Jul 18, 11:35 UTCJul 18, 14:20 UTC2h 45m
2026-07-18 TOM5AY LGW → SUF Jul 18, 06:40 UTCJul 18, 09:15 UTC2h 35m
2026-07-17 TOM4CX IBZ → LGW Jul 17, 10:55 UTCJul 17, 12:50 UTC1h 55m
2026-07-17 TOM7BJ LGW → IBZ Jul 17, 07:14 UTCJul 17, 09:15 UTC2h 0m
2026-07-16 TOM6FB AGP → BHX Jul 16, 23:40 UTCJul 17, 04:10 UTC4h 30m
2026-07-16 TOM1VE - Jul 16, 18:29 UTCJul 16, 22:25 UTC3h 55m
2026-07-16 TOM9NK EFL → LGW Jul 16, 13:15 UTCJul 16, 16:30 UTC3h 15m
2026-07-16 TOM8DE LGW → EFL Jul 16, 09:10 UTCJul 16, 12:00 UTC2h 50m
2026-07-15 TOM5HT RHO → LGW Jul 15, 13:45 UTCJul 15, 17:55 UTC4h 10m
2026-07-15 TOM6FA LGW → RHO Jul 15, 08:55 UTCJul 15, 12:15 UTC3h 20m
2026-07-15 TOM8HX - Jul 15, 03:10 UTCJul 15, 06:35 UTC3h 25m
2026-07-14 TOM8XG - Jul 14, 23:10 UTCJul 15, 02:05 UTC2h 55m
2026-07-14 TOM9GM - Jul 14, 17:15 UTCJul 14, 20:25 UTC3h 10m
2026-07-14 TOM6HT LGW → EFL Jul 14, 12:55 UTCJul 14, 15:45 UTC2h 50m
2026-07-14 TOM24J - Jul 14, 09:30 UTCJul 14, 11:25 UTC1h 55m
2026-07-14 TOM1WN - Jul 14, 06:15 UTCJul 14, 08:00 UTC1h 45m
2026-07-13 TOM5175 - Jul 13, 20:30 UTCJul 14, 00:00 UTC3h 30m
2026-07-13 TOM5174 LGW → TFS Jul 13, 14:50 UTCJul 13, 18:50 UTC4h 0m
2026-07-13 TOM1GY - Jul 13, 10:05 UTCJul 13, 13:05 UTC3h 0m

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

Mode-S 405E23 frequently asked

What is Mode-S code 405E23?
405E23 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-FDZR.
Where is Mode-S 405E23 registered?
Mode-S code 405E23 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 405E23 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 405E23, octal 20057043, decimal 4,218,403.
What flights does 405E23 operate?
Mode-S 405E23 has broadcast 20 distinct callsigns, including TOM4KE, TOM793, TOM792, TOM74G, TOM62H.