Apparatus

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sensors Mode-S transponder

400666

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-BMRD · BOEING 757-200

Hex
400666
Octal
20003146
Decimal
4,195,942
Country
GB
Tail
G-BMRD
Type
B752
No current signal · last broadcast Jul 25, 09:15 UTC
Flights observed
193
Distinct callsigns
20
Country
GB
Last broadcast
Jul 25, 09:15 UTC

Last known position

Most recent position reported by Mode-S 400666.

Country allocation

The ICAO 24-bit address 400666 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
DHK12G - 31 2026-07-24
DHK2876 DHL Air 28 2026-07-23
DHK2877 - 25 2026-07-23
DHK209P - 17 2026-07-22
DHK7017 - 16 2026-07-22
DHK52H DHL Air 16 2026-07-23
DHK2134 DHL Air 13 2026-07-25
DHK2135 DHL Air 10 2026-07-21
DHK4983 - 9 2026-06-22
DHK2506 - 3 2026-06-13
DHK201P DHL Air 3 2026-07-25
DHK838P - 2 2026-07-24
DHK838 - 2 2026-05-29
DHK801 DHL Air 2 2026-06-11
DHK4894 - 2 2026-05-01
DHK428 - 2 2026-04-30
DHX823 - 1 2026-06-12
DHK852 - 1 2026-07-04
DHK851 - 1 2026-07-04
DHK822 DHL Air 1 2026-06-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 DHK201P EDI → LEJ Jul 25, 07:35 UTCJul 25, 09:10 UTC1h 35m
2026-07-25 DHK2134 LEJ → EDI Jul 25, 03:55 UTCJul 25, 05:45 UTC1h 50m
2026-07-24 DHK838P GVA → LEJ Jul 24, 05:45 UTCJul 24, 07:00 UTC1h 15m
2026-07-24 DHK12G LEJ → GVA Jul 24, 02:55 UTCJul 24, 04:05 UTC1h 10m
2026-07-23 DHK52H EMA → LEJ Jul 23, 22:35 UTCJul 24, 00:10 UTC1h 35m
2026-07-23 DHK2877 ABZ → EMA Jul 23, 18:35 UTCJul 23, 19:30 UTC55m
2026-07-23 DHK2876 EMA → ABZ Jul 23, 05:15 UTCJul 23, 06:05 UTC50m
2026-07-22 DHK7017 - Jul 22, 22:05 UTCJul 23, 00:00 UTC1h 55m
2026-07-22 DHK209P - Jul 22, 19:05 UTCJul 22, 19:55 UTC50m
2026-07-22 DHK12G LEJ → GVA Jul 22, 02:55 UTCJul 22, 04:10 UTC1h 15m
2026-07-21 DHK2135 EDI → LEJ Jul 21, 19:25 UTCJul 21, 21:05 UTC1h 40m
2026-07-21 DHK2134 LEJ → EDI Jul 21, 02:55 UTCJul 21, 04:40 UTC1h 45m
2026-07-20 DHK52H EMA → LEJ Jul 20, 22:35 UTCJul 21, 00:05 UTC1h 29m
2026-07-20 DHK2877 ABZ → EMA Jul 20, 18:35 UTCJul 20, 19:25 UTC50m
2026-07-20 DHK2876 EMA → ABZ Jul 20, 04:15 UTCJul 20, 05:05 UTC50m
2026-07-17 DHK2877 ABZ → EMA Jul 17, 18:29 UTCJul 17, 19:20 UTC50m
2026-07-17 DHK2876 EMA → ABZ Jul 17, 05:10 UTCJul 17, 06:05 UTC55m
2026-07-16 DHK7017 - Jul 16, 23:29 UTCJul 17, 01:25 UTC1h 55m
2026-07-16 DHK209P GVA → BLQ Jul 16, 19:05 UTCJul 16, 19:50 UTC45m
2026-07-16 DHK12G - Jul 16, 02:55 UTCJul 16, 04:15 UTC1h 20m
2026-07-15 DHK52H EMA → LEJ Jul 15, 22:35 UTCJul 16, 00:00 UTC1h 25m
2026-07-15 DHK2877 ABZ → EMA Jul 15, 18:30 UTCJul 15, 19:25 UTC55m
2026-07-15 DHK2876 EMA → ABZ Jul 15, 05:10 UTCJul 15, 06:05 UTC55m
2026-07-14 DHK7017 - Jul 14, 22:25 UTCJul 15, 00:25 UTC1h 59m
2026-07-14 DHK209P GVA → BLQ Jul 14, 19:05 UTCJul 14, 19:50 UTC45m
2026-07-14 DHK12G LEJ → GVA Jul 14, 03:05 UTCJul 14, 04:15 UTC1h 10m
2026-07-10 DHK838P - Jul 10, 05:25 UTCJul 10, 06:35 UTC1h 10m
2026-07-10 DHK12G LEJ → GVA Jul 10, 02:55 UTCJul 10, 04:05 UTC1h 10m
2026-07-09 DHK2135 - Jul 9, 19:30 UTCJul 9, 21:10 UTC1h 40m
2026-07-09 DHK2134 LEJ → EDI Jul 9, 03:10 UTCJul 9, 04:55 UTC1h 45m
2026-07-08 DHK52H EMA → LEJ Jul 8, 22:35 UTCJul 9, 00:10 UTC1h 35m
2026-07-08 DHK2877 ABZ → EMA Jul 8, 18:40 UTCJul 8, 19:40 UTC1h 0m
2026-07-08 DHK2876 EMA → ABZ Jul 8, 05:05 UTCJul 8, 06:00 UTC55m
2026-07-07 DHK7017 BLQ → EMA Jul 7, 22:20 UTCJul 8, 00:15 UTC1h 55m
2026-07-07 DHK209P GVA → BLQ Jul 7, 19:10 UTCJul 7, 20:00 UTC50m
2026-07-07 DHK12G LEJ → GVA Jul 7, 03:00 UTCJul 7, 04:15 UTC1h 15m
2026-07-06 DHK52H EMA → LEJ Jul 6, 22:40 UTCJul 7, 00:05 UTC1h 25m
2026-07-06 DHK2877 ABZ → EMA Jul 6, 18:40 UTCJul 6, 19:35 UTC55m
2026-07-06 DHK2876 - Jul 6, 04:15 UTCJul 6, 05:05 UTC50m
2026-07-04 DHK852 MXP → EMA Jul 4, 05:30 UTCJul 4, 07:10 UTC1h 40m
2026-07-04 DHK851 EMA → MXP Jul 4, 02:20 UTCJul 4, 03:50 UTC1h 30m
2026-07-03 DHK2877 ABZ → EMA Jul 3, 18:30 UTCJul 3, 19:25 UTC55m
2026-07-03 DHK2876 EMA → ABZ Jul 3, 05:10 UTCJul 3, 06:10 UTC1h 0m
2026-07-02 DHK7017 - Jul 2, 22:45 UTCJul 3, 00:45 UTC2h 0m
2026-07-02 DHK209P - Jul 2, 19:05 UTCJul 2, 19:55 UTC50m
2026-07-02 DHK12G LEJ → GVA Jul 2, 02:55 UTCJul 2, 04:10 UTC1h 15m
2026-07-01 DHK52H EMA → LEJ Jul 1, 23:00 UTCJul 2, 00:20 UTC1h 20m
2026-06-30 DHK209P - Jun 30, 19:00 UTCJun 30, 20:25 UTC1h 25m
2026-06-30 DHK12G - Jun 30, 03:45 UTCJun 30, 04:10 UTC25m
2026-06-30 DHK12G - Jun 30, 02:50 UTCJun 30, 03:40 UTC50m

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

Mode-S 400666 frequently asked

What is Mode-S code 400666?
400666 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-BMRD.
Where is Mode-S 400666 registered?
Mode-S code 400666 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 400666 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 09:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 400666, octal 20003146, decimal 4,195,942.
What flights does 400666 operate?
Mode-S 400666 has broadcast 20 distinct callsigns, including DHK12G, DHK2876, DHK2877, DHK209P, DHK7017.