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 12h ago
Flights observed
178
Distinct callsigns
20
Country
GB
Last broadcast
12h 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 20 distinct

Callsign Airline Flights Last seen
DHK12G - 29 2026-07-16
DHK2876 DHL Air 26 2026-07-17
DHK2877 - 23 2026-07-17
DHK209P - 16 2026-07-16
DHK7017 - 15 2026-07-16
DHK52H - 14 2026-07-15
DHK2134 - 11 2026-07-09
DHK4983 - 9 2026-06-22
DHK2135 - 9 2026-07-09
DHK2506 - 3 2026-06-13
DHK838 - 2 2026-05-29
DHK801 DHL Air 2 2026-06-11
DHK4894 - 2 2026-05-01
DHK428 - 2 2026-04-30
DHK201P DHL Air 2 2026-05-30
DHX823 - 1 2026-06-12
DHK852 - 1 2026-07-04
DHK851 - 1 2026-07-04
DHK838P - 1 2026-07-10
DHK822 DHL Air 1 2026-06-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-06-29 DHK52H EMA → LEJ Jun 29, 22:55 UTCJun 30, 00:25 UTC1h 30m
2026-06-29 DHK2877 ABZ → EMA Jun 29, 18:39 UTCJun 29, 19:35 UTC55m
2026-06-29 DHK2876 - Jun 29, 04:14 UTCJun 29, 05:00 UTC45m
2026-06-26 DHK2877 ABZ → EMA Jun 26, 19:00 UTCJun 26, 20:00 UTC1h 0m
2026-06-26 DHK2876 EMA → ABZ Jun 26, 05:19 UTCJun 26, 06:09 UTC50m
2026-06-25 DHK7017 - Jun 25, 22:14 UTCJun 26, 00:05 UTC1h 50m
2026-06-25 DHK209P GVA → BLQ Jun 25, 19:24 UTCJun 25, 20:09 UTC45m
2026-06-25 DHK12G LEJ → GVA Jun 25, 02:59 UTCJun 25, 04:10 UTC1h 10m
2026-06-24 DHK52H EMA → LEJ Jun 24, 23:10 UTCJun 25, 00:44 UTC1h 35m
2026-06-24 DHK2877 ABZ → EMA Jun 24, 18:39 UTCJun 24, 19:34 UTC55m
2026-06-24 DHK2876 EMA → ABZ Jun 24, 05:34 UTCJun 24, 06:25 UTC50m
2026-06-23 DHK7017 - Jun 23, 22:05 UTCJun 23, 23:59 UTC1h 55m
2026-06-23 DHK209P - Jun 23, 19:04 UTCJun 23, 20:04 UTC1h 0m
2026-06-23 DHK12G LEJ → GVA Jun 23, 03:00 UTCJun 23, 04:14 UTC1h 15m
2026-06-22 DHK4983 GVA → LEJ Jun 22, 19:40 UTCJun 22, 20:49 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 12h 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 20 distinct callsigns, including DHK12G, DHK2876, DHK2877, DHK209P, DHK7017.