Apparatus

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sensors Mode-S transponder

406AC4

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-GDFZ · BOEING 737-800

Hex
406AC4
Octal
20065304
Decimal
4,221,636
Country
GB
Tail
G-GDFZ
Type
B738
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
411
Distinct callsigns
20
Country
GB
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S 406AC4.

Country allocation

The ICAO 24-bit address 406AC4 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
EXS31PY - 6 2026-07-06
EXS1FD - 6 2026-07-06
EXS916 - 5 2026-07-07
EXS48F Jet2.com 5 2026-07-24
EXS42RW Jet2.com 5 2026-07-24
EXS62BW - 4 2026-04-16
EXS52KG - 4 2026-07-07
EXS45RA - 4 2026-07-07
EXS1314 - 4 2026-06-20
EXS9GL - 3 2026-06-17
EXS8VW - 3 2026-04-14
EXS8GN Jet2.com 3 2026-04-29
EXS863R Jet2.com 3 2026-07-25
EXS82PX Jet2.com 3 2026-04-15
EXS823K Jet2.com 3 2026-07-20
EXS7WL - 3 2026-06-29
EXS7TF - 3 2026-07-03
EXS79NX Jet2.com 3 2026-06-18
EXS79AF Jet2.com 3 2026-06-11
EXS75LS Jet2.com 3 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 EXS3212 BJV → LPL Jul 26, 21:00 UTCJul 26, 23:00 UTC2h 0m
2026-07-26 EXS3211 LPL → BJV Jul 26, 16:15 UTCJul 26, 19:25 UTC3h 10m
2026-07-26 EXS152B TFS → LTN Jul 26, 12:20 UTCJul 26, 14:45 UTC2h 25m
2026-07-26 EXS32DW - Jul 26, 07:45 UTCJul 26, 09:55 UTC2h 10m
2026-07-25 EXS347Q PMI → LTN Jul 25, 20:45 UTCJul 26, 00:50 UTC4h 5m
2026-07-25 EXS863R LTN → MAN Jul 25, 15:10 UTCJul 25, 18:40 UTC3h 30m
2026-07-25 EXS51MZ ALC → LTN Jul 25, 11:15 UTCJul 25, 13:50 UTC2h 35m
2026-07-25 EXS75LS LTN → ALC Jul 25, 07:10 UTCJul 25, 09:50 UTC2h 40m
2026-07-24 EXS891C PMI → LPL Jul 24, 20:00 UTCJul 24, 22:15 UTC2h 15m
2026-07-24 EXS35NU LPL → PMI Jul 24, 16:10 UTCJul 24, 18:20 UTC2h 10m
2026-07-24 EXS42RW TFS → LPL Jul 24, 10:45 UTCJul 24, 14:15 UTC3h 30m
2026-07-24 EXS48F EDI → MLA Jul 24, 05:05 UTCJul 24, 09:05 UTC4h 0m
2026-07-23 EXS347Q PMI → LTN Jul 23, 21:05 UTCJul 24, 00:30 UTC3h 25m
2026-07-23 EXS863R LTN → MAN Jul 23, 15:10 UTCJul 23, 19:15 UTC4h 5m
2026-07-23 EXS51MZ - Jul 23, 11:30 UTCJul 23, 14:05 UTC2h 35m
2026-07-23 EXS75LS LTN → ALC Jul 23, 07:20 UTCJul 23, 09:55 UTC2h 35m
2026-07-22 EXS3212 BJV → LPL Jul 22, 19:15 UTCJul 22, 23:20 UTC4h 5m
2026-07-22 EXS3211 LPL → BJV Jul 22, 14:25 UTCJul 22, 18:05 UTC3h 40m
2026-07-22 EXS17J - Jul 22, 10:20 UTCJul 22, 12:25 UTC2h 5m
2026-07-21 EXS24JS FCO → EDI Jul 21, 21:15 UTCJul 22, 01:30 UTC4h 15m
2026-07-21 EXS579J EDI → FCO Jul 21, 16:05 UTCJul 21, 19:45 UTC3h 40m
2026-07-21 EXS42RW TFS → LPL Jul 21, 10:50 UTCJul 21, 14:30 UTC3h 40m
2026-07-21 EXS48F EDI → MLA Jul 21, 05:05 UTCJul 21, 08:55 UTC3h 50m
2026-07-20 EXS81K AYT → LTN Jul 20, 21:55 UTCJul 21, 02:15 UTC4h 20m
2026-07-20 EXS54FS LPL → AYT Jul 20, 16:40 UTCJul 20, 20:45 UTC4h 5m
2026-07-20 EXS72C TFS → LPL Jul 20, 11:25 UTCJul 20, 15:10 UTC3h 45m
2026-07-20 EXS823K LPL → TFS Jul 20, 05:25 UTCJul 20, 09:10 UTC3h 45m
2026-07-19 EXS42RW TFS → LPL Jul 19, 19:20 UTCJul 19, 23:05 UTC3h 45m
2026-07-19 EXS48F EDI → MLA Jul 19, 13:50 UTCJul 19, 17:40 UTC3h 50m
2026-07-19 EXS16JU FAO → LPL Jul 19, 10:05 UTCJul 19, 12:40 UTC2h 35m
2026-07-19 EXS64QW LPL → FAO Jul 19, 06:00 UTCJul 19, 08:45 UTC2h 45m
2026-07-18 EXS72C TFS → LPL Jul 18, 19:30 UTCJul 18, 23:10 UTC3h 40m
2026-07-18 EXS823K - Jul 18, 14:05 UTCJul 18, 18:05 UTC4h 0m
2026-07-18 EXS43KO - Jul 18, 10:20 UTCJul 18, 12:50 UTC2h 30m
2026-07-18 EXS67T - Jul 18, 06:35 UTCJul 18, 08:55 UTC2h 20m
2026-07-17 EXS53G FAO → LTN Jul 17, 21:50 UTCJul 18, 00:55 UTC3h 5m
2026-07-17 EXS49A - Jul 17, 17:05 UTCJul 17, 19:40 UTC2h 35m
2026-07-17 EXS42RW TFS → LPL Jul 17, 10:55 UTCJul 17, 14:30 UTC3h 35m
2026-07-17 EXS48F EDI → MLA Jul 17, 05:15 UTCJul 17, 09:10 UTC3h 55m
2026-07-16 EXS72C - Jul 16, 19:10 UTCJul 16, 22:55 UTC3h 45m
2026-07-16 EXS823K - Jul 16, 13:34 UTCJul 16, 17:30 UTC3h 55m
2026-07-16 EXS16JU FAO → LPL Jul 16, 09:35 UTCJul 16, 12:00 UTC2h 25m
2026-07-16 EXS64QW LPL → FAO Jul 16, 05:30 UTCJul 16, 08:05 UTC2h 35m
2026-07-15 EXS76XB PFO → LPL Jul 15, 19:15 UTCJul 16, 00:00 UTC4h 45m
2026-07-15 EXS41UP LPL → PFO Jul 15, 13:00 UTCJul 15, 17:10 UTC4h 10m
2026-07-15 EXS87KE REU → LPL Jul 15, 08:45 UTCJul 15, 10:40 UTC1h 55m
2026-07-15 EXS65B - Jul 15, 05:25 UTCJul 15, 07:30 UTC2h 5m
2026-07-14 EXS347Q - Jul 14, 21:05 UTCJul 15, 00:30 UTC3h 24m
2026-07-14 EXS863R - Jul 14, 15:25 UTCJul 14, 19:20 UTC3h 55m
2026-07-14 EXS51MZ - Jul 14, 11:45 UTCJul 14, 14:05 UTC2h 20m

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

Mode-S 406AC4 frequently asked

What is Mode-S code 406AC4?
406AC4 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-GDFZ.
Where is Mode-S 406AC4 registered?
Mode-S code 406AC4 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 406AC4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 406AC4, octal 20065304, decimal 4,221,636.
What flights does 406AC4 operate?
Mode-S 406AC4 has broadcast 20 distinct callsigns, including EXS31PY, EXS1FD, EXS916, EXS48F, EXS42RW.