Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

406B84

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-GATS · AIRBUS A-320

Hex
406B84
Octal
20065604
Decimal
4,221,828
Country
GB
Tail
G-GATS
Type
A320
Broadcasting now · callsign EFW9ED · 18,625 ft
Flights observed
366
Distinct callsigns
20
Country
GB
Last broadcast
Jul 26, 17:55 UTC

Current position

406B84 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 406B84 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
EFW50Z - 11 2026-07-05
EFW741W - 10 2026-07-05
BAW2817 British Airways 9 2026-07-04
BAW2816 - 9 2026-07-04
EFW9UQ - 7 2026-07-08
EFW9TT BA Euroflyer 7 2026-06-12
EFW9SA BA Euroflyer 7 2026-06-11
EFW7SN - 7 2026-07-21
EFW69BK BA Euroflyer 7 2026-07-26
EFW67P BA Euroflyer 7 2026-06-12
EFW67A BA Euroflyer 7 2026-07-26
EFW5JM BA Euroflyer 7 2026-06-11
EFW39FL - 7 2026-07-21
EFW91P - 6 2026-07-02
EFW8CD BA Euroflyer 6 2026-06-12
EFW81PT - 6 2026-07-14
EFW7JD BA Euroflyer 6 2026-07-22
EFW76D - 6 2026-07-02
EFW5BR - 6 2026-07-03
EFW56R - 6 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 EFW69BK AYT → LGW Jul 26, 13:20 UTCJul 26, 17:50 UTC4h 30m
2026-07-26 EFW67A LGW → AYT Jul 26, 08:25 UTCJul 26, 11:50 UTC3h 25m
2026-07-25 EFW29WB AGP → LGW Jul 25, 20:55 UTCJul 25, 23:15 UTC2h 20m
2026-07-25 EFW26CX LGW → AGP Jul 25, 17:20 UTCJul 25, 19:30 UTC2h 10m
2026-07-25 EFW9762 ATH → LGW Jul 25, 08:40 UTCJul 25, 12:10 UTC3h 30m
2026-07-24 EFW39YP LGW → KLX Jul 24, 06:10 UTCJul 24, 09:50 UTC3h 40m
2026-07-23 EFW682Q DBV → LGW Jul 23, 18:15 UTCJul 23, 20:40 UTC2h 25m
2026-07-23 EFW878W LGW → DBV Jul 23, 14:40 UTCJul 23, 16:50 UTC2h 10m
2026-07-23 EFW12LS MLA → LGW Jul 23, 10:15 UTCJul 23, 13:25 UTC3h 10m
2026-07-23 EFW9RZ LGW → MLA Jul 23, 06:15 UTCJul 23, 08:45 UTC2h 30m
2026-07-22 EFW7JD AGP → LGW Jul 22, 21:00 UTCJul 22, 23:10 UTC2h 10m
2026-07-22 EFW7EL - Jul 22, 17:30 UTCJul 22, 19:30 UTC2h 0m
2026-07-22 EFW59AU - Jul 22, 11:50 UTCJul 22, 15:40 UTC3h 50m
2026-07-21 EFW7SN - Jul 21, 19:30 UTCJul 21, 23:55 UTC4h 25m
2026-07-21 EFW39FL LGW → PFO Jul 21, 14:20 UTCJul 21, 18:10 UTC3h 50m
2026-07-21 EFW29BA MAH → LGW Jul 21, 10:30 UTCJul 21, 12:25 UTC1h 55m
2026-07-21 EFW39VE LGW → MAH Jul 21, 07:25 UTCJul 21, 09:15 UTC1h 50m
2026-07-20 EFW8MJ FNC → LGW Jul 20, 20:45 UTCJul 20, 23:45 UTC3h 0m
2026-07-20 EFW8NM LGW → FNC Jul 20, 16:25 UTCJul 20, 19:45 UTC3h 20m
2026-07-19 EFW76HL MAH → LGW Jul 19, 18:00 UTCJul 19, 19:55 UTC1h 55m
2026-07-19 EFW26PP LGW → MAH Jul 19, 15:00 UTCJul 19, 16:45 UTC1h 45m
2026-07-19 EFW9750 IBZ → LGW Jul 19, 09:55 UTCJul 19, 12:05 UTC2h 10m
2026-07-18 EFW79YW LGW → IBZ Jul 18, 08:45 UTCJul 18, 11:00 UTC2h 15m
2026-07-17 EFW69BK - Jul 17, 18:55 UTCJul 17, 23:14 UTC4h 20m
2026-07-17 EFW67A LGW → AYT Jul 17, 13:40 UTCJul 17, 17:25 UTC3h 45m
2026-07-17 EFW11GT MPL → LGW Jul 17, 09:25 UTCJul 17, 10:44 UTC1h 20m
2026-07-17 EFW65ZZ - Jul 17, 06:40 UTCJul 17, 08:04 UTC1h 25m
2026-07-16 EFW93ML - Jul 16, 20:09 UTCJul 16, 23:29 UTC3h 20m
2026-07-16 EFW595N - Jul 16, 14:55 UTCJul 16, 18:25 UTC3h 30m
2026-07-14 EFW7JD - Jul 14, 21:00 UTCJul 14, 23:15 UTC2h 14m
2026-07-14 EFW7EL - Jul 14, 17:55 UTCJul 14, 19:55 UTC2h 0m
2026-07-14 EFW81PT - Jul 14, 13:20 UTCJul 14, 16:30 UTC3h 10m
2026-07-14 EFW33VR - Jul 14, 07:20 UTCJul 14, 11:15 UTC3h 55m
2026-07-12 EFW83SY RHO → LGW Jul 12, 18:30 UTCJul 12, 22:20 UTC3h 50m
2026-07-12 EFW147P LGW → RHO Jul 12, 13:50 UTCJul 12, 17:20 UTC3h 30m
2026-07-12 EFW75J DBV → LGW Jul 12, 09:30 UTCJul 12, 12:05 UTC2h 35m
2026-07-12 EFW34BY LGW → DBV Jul 12, 05:35 UTCJul 12, 08:15 UTC2h 40m
2026-07-11 EFW9ED - Jul 11, 22:35 UTCJul 12, 00:35 UTC2h 0m
2026-07-11 EFW7HH LGW → ALC Jul 11, 17:45 UTCJul 11, 19:50 UTC2h 5m
2026-07-11 EFW5BP LGW → LGW Jul 11, 07:50 UTCJul 11, 15:20 UTC7h 30m
2026-07-10 EFW6DG - Jul 10, 12:20 UTCJul 10, 17:05 UTC4h 45m
2026-07-10 EFW24AD - Jul 10, 07:10 UTCJul 10, 11:00 UTC3h 50m
2026-07-08 EFW9ED - Jul 8, 20:10 UTCJul 8, 22:05 UTC1h 55m
2026-07-08 EFW7HH LGW → ALC Jul 8, 17:00 UTCJul 8, 18:55 UTC1h 55m
2026-07-08 EFW91BM - Jul 8, 12:20 UTCJul 8, 15:00 UTC2h 40m
2026-07-08 EFW9UQ - Jul 8, 08:30 UTCJul 8, 10:45 UTC2h 15m
2026-07-07 EFW7SN - Jul 7, 18:50 UTCJul 7, 23:10 UTC4h 20m
2026-07-07 EFW39FL LGW → PFO Jul 7, 13:40 UTCJul 7, 17:35 UTC3h 55m
2026-07-07 EFW75J DBV → LGW Jul 7, 09:40 UTCJul 7, 12:10 UTC2h 30m
2026-07-07 EFW34BY LGW → DBV Jul 7, 06:05 UTCJul 7, 08:10 UTC2h 5m

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

Mode-S 406B84 frequently asked

What is Mode-S code 406B84?
406B84 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-GATS.
Where is Mode-S 406B84 registered?
Mode-S code 406B84 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 406B84 broadcasting right now?
Yes. Mode-S 406B84 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 406B84, octal 20065604, decimal 4,221,828.
What flights does 406B84 operate?
Mode-S 406B84 has broadcast 20 distinct callsigns, including EFW50Z, EFW741W, BAW2817, BAW2816, EFW9UQ.