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sensors Mode-S transponder

400B4B

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-DHLM · BOEING 767-300

Hex
400B4B
Octal
20005513
Decimal
4,197,195
Country
GB
Tail
G-DHLM
Type
B763
Broadcasting now · callsign DHK951 · 38,000 ft
Flights observed
258
Distinct callsigns
20
Country
GB
Last broadcast
Jul 26, 21:50 UTC

Current position

400B4B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 400B4B 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
DHK2506 - 17 2026-07-16
DHK2507 - 14 2026-07-16
DHK842 - 10 2026-07-16
DHK453 - 10 2026-07-15
DHK3999 - 10 2026-07-20
DHK3998 - 10 2026-07-09
DHK7LK DHL Air 9 2026-07-21
DHK4SM - 9 2026-07-11
DHK4AW DHL Air 9 2026-07-23
DHK036 - 9 2026-06-29
DHK800 - 7 2026-07-23
DHK316 - 7 2026-07-12
DHK035 - 7 2026-07-22
DHK812 - 6 2026-06-27
DHK56W - 6 2026-07-17
DHK4911 - 6 2026-07-21
DHK4904 - 6 2026-07-21
DHK811 DHL Air 5 2026-06-11
DHK038 - 5 2026-06-25
DHK037 - 5 2026-06-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DHK801 EMA → LEJ Jul 26, 20:10 UTCJul 26, 21:45 UTC1h 35m
2026-07-26 DHK154 - Jul 26, 01:30 UTCJul 26, 18:20 UTC16h 51m
2026-07-25 DHK075 - Jul 25, 16:50 UTCJul 26, 16:40 UTC23h 51m
2026-07-25 DHK075 - Jul 25, 15:40 UTCJul 26, 14:45 UTC23h 6m
2026-07-25 DHK076 EMA → EMA Jul 25, 13:35 UTCJul 26, 12:20 UTC22h 46m
2026-07-24 DHK181 - Jul 24, 21:05 UTCJul 25, 03:00 UTC5h 55m
2026-07-24 DHK076 EMA → EMA Jul 24, 13:10 UTCJul 24, 14:00 UTC50m
2026-07-23 DHK4AW LEJ → EMA Jul 23, 23:50 UTCJul 24, 01:10 UTC1h 20m
2026-07-23 DHK800 EMA → LEJ Jul 23, 20:05 UTCJul 23, 21:30 UTC1h 25m
2026-07-23 DHK369 CVG → LEJ Jul 23, 10:50 UTCJul 23, 16:50 UTC6h 0m
2026-07-23 DHK368 EMA → CVG Jul 23, 01:15 UTCJul 23, 08:30 UTC7h 15m
2026-07-22 DHK035 BRU → EMA Jul 22, 22:05 UTCJul 22, 22:55 UTC50m
2026-07-22 DHK841 EMA → BRU Jul 22, 19:20 UTCJul 22, 20:10 UTC50m
2026-07-22 DHK4AW LEJ → EMA Jul 22, 00:00 UTCJul 22, 01:20 UTC1h 20m
2026-07-21 DHK4911 BSL → LEJ Jul 21, 20:50 UTCJul 21, 21:50 UTC1h 0m
2026-07-21 DHK4904 LEJ → BSL Jul 21, 04:05 UTCJul 21, 05:00 UTC55m
2026-07-21 DHK7LK EMA → LEJ Jul 21, 00:10 UTCJul 21, 01:40 UTC1h 30m
2026-07-20 DHK3999 KEF → EMA Jul 20, 17:10 UTCJul 20, 19:15 UTC2h 5m
2026-07-20 DHK3996 EMA → LEJ Jul 20, 02:10 UTCJul 20, 04:45 UTC2h 35m
2026-07-17 DHK4AW LEJ → EMA Jul 17, 22:35 UTCJul 18, 00:00 UTC1h 25m
2026-07-17 DHK56W EMA → LEJ Jul 17, 19:09 UTCJul 17, 20:29 UTC1h 20m
2026-07-16 DHK2507 - Jul 16, 19:20 UTCJul 16, 20:00 UTC40m
2026-07-16 DHK2506 EMA → BFS Jul 16, 04:25 UTCJul 16, 05:05 UTC40m
2026-07-16 DHK842 BRU → EMA Jul 16, 01:05 UTCJul 16, 01:50 UTC45m
2026-07-15 DHK453 EMA → BRU Jul 15, 22:20 UTCJul 15, 23:05 UTC45m
2026-07-15 DHK2507 BHD → EMA Jul 15, 19:25 UTCJul 15, 20:05 UTC40m
2026-07-15 DHK2506 EMA → BFS Jul 15, 04:25 UTCJul 15, 05:05 UTC40m
2026-07-15 DHK842 BRU → EMA Jul 15, 02:05 UTCJul 15, 02:55 UTC50m
2026-07-14 DHK453 EMA → BRU Jul 14, 23:40 UTCJul 15, 00:30 UTC50m
2026-07-14 DHK2507 - Jul 14, 20:40 UTCJul 14, 21:20 UTC40m
2026-07-14 DHK2506 EMA → BFS Jul 14, 04:35 UTCJul 14, 05:10 UTC35m
2026-07-14 DHK842 BRU → EMA Jul 14, 01:00 UTCJul 14, 01:45 UTC45m
2026-07-13 DHK453 - Jul 13, 22:30 UTCJul 13, 23:20 UTC50m
2026-07-13 DHK700P - Jul 13, 04:30 UTCJul 13, 05:10 UTC40m
2026-07-13 DHK2506 EMA → BFS Jul 13, 02:40 UTCJul 13, 03:25 UTC45m
2026-07-12 DHK009 - Jul 12, 14:30 UTCJul 12, 22:00 UTC7h 30m
2026-07-12 DHK316 - Jul 12, 01:25 UTCJul 12, 10:15 UTC8h 50m
2026-07-12 DHK316 LEJ → LEJ Jul 12, 00:55 UTCJul 12, 01:15 UTC20m
2026-07-11 DHK316 - Jul 11, 06:25 UTCJul 11, 08:01 UTC1h 35m
2026-07-11 DHK2506 EMA → BFS Jul 11, 04:20 UTCJul 11, 05:01 UTC40m
2026-07-11 DHK4SM LEJ → EMA Jul 11, 01:00 UTCJul 11, 02:20 UTC1h 20m
2026-07-10 DHK4911 - Jul 10, 21:05 UTCJul 10, 22:00 UTC55m
2026-07-10 DHK4904 LEJ → BSL Jul 10, 02:50 UTCJul 10, 03:40 UTC50m
2026-07-09 DHK7LK EMA → LEJ Jul 9, 21:50 UTCJul 9, 23:10 UTC1h 20m
2026-07-09 DHK3999 KEF → EMA Jul 9, 17:00 UTCJul 9, 19:20 UTC2h 20m
2026-07-09 DHK3998 EMA → KEF Jul 9, 04:40 UTCJul 9, 07:00 UTC2h 20m
2026-07-09 DHK4SM LEJ → EMA Jul 9, 01:35 UTCJul 9, 03:00 UTC1h 25m
2026-07-08 DHK56W EMA → LEJ Jul 8, 19:15 UTCJul 8, 20:40 UTC1h 25m
2026-07-08 DHK4SM LEJ → EMA Jul 8, 01:35 UTCJul 8, 03:00 UTC1h 25m
2026-07-07 DHK7LK EMA → LEJ Jul 7, 21:55 UTCJul 7, 23:15 UTC1h 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-DHLM page for operator, model, and routing details .

Mode-S 400B4B frequently asked

What is Mode-S code 400B4B?
400B4B is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-DHLM.
Where is Mode-S 400B4B registered?
Mode-S code 400B4B 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 400B4B broadcasting right now?
Yes. Mode-S 400B4B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 400B4B, octal 20005513, decimal 4,197,195.
What flights does 400B4B operate?
Mode-S 400B4B has broadcast 20 distinct callsigns, including DHK2506, DHK2507, DHK842, DHK453, DHK3999.