Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 3d ago
Flights observed
88
Distinct callsigns
15
Country
GB
Last broadcast
3d ago

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 15 distinct

Callsign Airline Flights Last seen
DHK12G - 17 2026-05-29
DHK2876 DHL Air 10 2026-05-28
DHK2134 DHL Air 10 2026-05-30
DHK4983 DHL Air 8 2026-05-18
DHK2135 DHL Air 8 2026-05-14
DHK7017 - 7 2026-05-27
DHK2877 DHL Air 7 2026-05-28
DHK209P - 7 2026-05-27
DHK52H DHL Air 4 2026-05-28
DHK838 - 2 2026-05-29
DHK4894 - 2 2026-05-01
DHK428 - 2 2026-04-30
DHK201P DHL Air 2 2026-05-30
DHK801P DHL Air 1 2026-05-08
DHK4958 - 1 2026-04-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 DHK201P EDI → LEJ May 30, 06:50 UTCMay 30, 07:30 UTC40m
2026-05-30 DHK2134 LEJ → EDI May 30, 04:00 UTCMay 30, 05:50 UTC1h 50m
2026-05-29 DHK838 - May 29, 05:40 UTCMay 29, 06:50 UTC1h 10m
2026-05-29 DHK12G LEJ → GVA May 29, 02:55 UTCMay 29, 04:05 UTC1h 10m
2026-05-28 DHK52H EMA → LEJ May 28, 22:35 UTCMay 29, 00:05 UTC1h 30m
2026-05-28 DHK2877 ABZ → EMA May 28, 18:40 UTCMay 28, 19:35 UTC55m
2026-05-28 DHK2876 EMA → ABZ May 28, 05:20 UTCMay 28, 06:15 UTC55m
2026-05-27 DHK7017 - May 27, 22:05 UTCMay 28, 00:00 UTC1h 55m
2026-05-27 DHK209P - May 27, 19:00 UTCMay 27, 19:50 UTC50m
2026-05-27 DHK12G LEJ → GVA May 27, 02:54 UTCMay 27, 04:09 UTC1h 15m
2026-05-26 DHK52H EMA → LEJ May 26, 22:39 UTCMay 27, 00:04 UTC1h 25m
2026-05-26 DHK2877 ABZ → EMA May 26, 18:55 UTCMay 26, 19:45 UTC50m
2026-05-26 DHK2876 EMA → ABZ May 26, 05:05 UTCMay 26, 05:54 UTC50m
2026-05-22 DHK2877 ABZ → EMA May 22, 18:40 UTCMay 22, 19:40 UTC1h 0m
2026-05-22 DHK2876 EMA → ABZ May 22, 05:15 UTCMay 22, 06:05 UTC50m
2026-05-21 DHK7017 - May 21, 22:30 UTCMay 22, 00:20 UTC1h 50m
2026-05-21 DHK209P GVA → BLQ May 21, 19:15 UTCMay 21, 20:00 UTC45m
2026-05-21 DHK12G LEJ → GVA May 21, 03:10 UTCMay 21, 04:20 UTC1h 10m
2026-05-20 DHK52H EMA → LEJ May 20, 23:00 UTCMay 21, 00:30 UTC1h 30m
2026-05-20 DHK2877 ABZ → EMA May 20, 18:35 UTCMay 20, 19:30 UTC55m
2026-05-20 DHK2876 EMA → ABZ May 20, 05:10 UTCMay 20, 06:05 UTC55m
2026-05-19 DHK7017 - May 19, 22:10 UTCMay 20, 00:05 UTC1h 55m
2026-05-19 DHK209P GVA → BLQ May 19, 19:00 UTCMay 19, 19:50 UTC50m
2026-05-19 DHK12G LEJ → GVA May 19, 03:00 UTCMay 19, 04:05 UTC1h 5m
2026-05-18 DHK4983 GVA → LEJ May 18, 19:45 UTCMay 18, 21:05 UTC1h 20m
2026-05-18 DHK12G LEJ → GVA May 18, 02:50 UTCMay 18, 04:05 UTC1h 15m
2026-05-16 DHK201P EDI → LEJ May 16, 07:01 UTCMay 16, 08:36 UTC1h 35m
2026-05-16 DHK2134 LEJ → EDI May 16, 03:55 UTCMay 16, 05:40 UTC1h 45m
2026-05-15 DHK4983 GVA → LEJ May 15, 19:40 UTCMay 15, 20:45 UTC1h 5m
2026-05-15 DHK12G LEJ → GVA May 15, 03:00 UTCMay 15, 04:10 UTC1h 10m
2026-05-14 DHK2135 EDI → LEJ May 14, 19:35 UTCMay 14, 21:20 UTC1h 45m
2026-05-14 DHK2134 LEJ → EDI May 14, 03:30 UTCMay 14, 05:10 UTC1h 40m
2026-05-13 DHK52H EMA → LEJ May 13, 22:45 UTCMay 14, 00:10 UTC1h 25m
2026-05-13 DHK2877 ABZ → EMA May 13, 18:35 UTCMay 13, 19:25 UTC50m
2026-05-13 DHK2876 EMA → ABZ May 13, 05:05 UTCMay 13, 06:05 UTC1h 0m
2026-05-12 DHK7017 - May 12, 22:01 UTCMay 12, 23:55 UTC1h 55m
2026-05-12 DHK209P - May 12, 19:00 UTCMay 12, 19:50 UTC50m
2026-05-12 DHK12G LEJ → GVA May 12, 02:55 UTCMay 12, 04:05 UTC1h 10m
2026-05-11 DHK2876 EMA → ABZ May 11, 18:55 UTCMay 11, 19:40 UTC45m
2026-05-11 DHK2876 EMA → ABZ May 11, 04:30 UTCMay 11, 05:25 UTC55m
2026-05-08 DHK801P EMA → LEJ May 8, 15:40 UTCMay 8, 16:35 UTC55m
2026-05-07 DHK2876 EMA → ABZ May 7, 05:10 UTCMay 7, 06:05 UTC55m
2026-05-06 DHK7017 - May 6, 22:25 UTCMay 7, 00:20 UTC1h 55m
2026-05-06 DHK209P GVA → BLQ May 6, 19:05 UTCMay 6, 19:50 UTC45m
2026-05-06 DHK12G LEJ → GVA May 6, 02:50 UTCMay 6, 04:05 UTC1h 15m
2026-05-05 DHK2135 EDI → LEJ May 5, 19:55 UTCMay 5, 21:35 UTC1h 40m
2026-05-05 DHK2134 LEJ → EDI May 5, 03:00 UTCMay 5, 04:45 UTC1h 45m
2026-05-04 DHK4983 GVA → LEJ May 4, 19:45 UTCMay 4, 20:55 UTC1h 10m
2026-05-04 DHK12G LEJ → GVA May 4, 02:54 UTCMay 4, 04:05 UTC1h 10m
2026-05-02 DHK838 GVA → LEJ May 2, 10:20 UTCMay 2, 11:30 UTC1h 10m

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 3d ago.
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 15 distinct callsigns, including DHK12G, DHK2876, DHK2134, DHK4983, DHK2135.