Apparatus

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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
No current signal · last broadcast 6h ago
Flights observed
228
Distinct callsigns
20
Country
GB
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 400B4B.

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 - 15 2026-07-14
DHK2507 - 11 2026-06-26
DHK3998 - 10 2026-07-09
DHK4SM - 9 2026-07-11
DHK3999 - 9 2026-07-09
DHK036 - 9 2026-06-29
DHK842 - 8 2026-07-14
DHK7LK - 8 2026-07-09
DHK453 - 8 2026-07-13
DHK316 - 7 2026-07-12
DHK812 - 6 2026-06-27
DHK800 DHL Air 6 2026-06-18
DHK4AW - 6 2026-07-07
DHK035 - 6 2026-07-01
DHK811 DHL Air 5 2026-06-11
DHK56W - 5 2026-07-08
DHK4911 - 5 2026-07-10
DHK4904 - 5 2026-07-10
DHK038 - 5 2026-06-25
DHK037 - 5 2026-06-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-07-07 DHK3999 - Jul 7, 17:15 UTCJul 7, 19:20 UTC2h 5m
2026-07-07 DHK3998 EMA → KEF Jul 7, 04:35 UTCJul 7, 07:10 UTC2h 35m
2026-07-07 DHK4AW LEJ → EMA Jul 7, 00:10 UTCJul 7, 01:40 UTC1h 30m
2026-07-04 DHK316 - Jul 4, 06:55 UTCJul 4, 08:30 UTC1h 35m
2026-07-04 DHK2506 EMA → BFS Jul 4, 04:25 UTCJul 4, 05:10 UTC45m
2026-07-04 DHK4SM LEJ → EMA Jul 4, 00:55 UTCJul 4, 02:25 UTC1h 30m
2026-07-03 DHK4911 - Jul 3, 21:00 UTCJul 3, 22:00 UTC1h 0m
2026-07-03 DHK4904 - Jul 3, 02:55 UTCJul 3, 03:45 UTC50m
2026-07-02 DHK56W EMA → LEJ Jul 2, 19:05 UTCJul 2, 20:20 UTC1h 15m
2026-07-02 DHK369 JFK → EMA Jul 2, 10:55 UTCJul 2, 16:55 UTC6h 0m
2026-07-02 DHK368 EMA → JFK Jul 2, 01:10 UTCJul 2, 08:30 UTC7h 20m
2026-07-01 DHK035 - Jul 1, 22:10 UTCJul 1, 23:00 UTC50m
2026-07-01 DHK035 - Jul 1, 14:50 UTCJul 1, 19:15 UTC4h 25m
2026-07-01 DHK035 - Jul 1, 13:15 UTCJul 1, 13:25 UTC10m
2026-06-30 DHK035 - Jun 30, 21:10 UTCJul 1, 03:35 UTC6h 25m
2026-06-30 DHK035 - Jun 30, 16:35 UTCJun 30, 18:45 UTC2h 10m
2026-06-29 DHK036 - Jun 29, 18:49 UTCJun 30, 18:45 UTC23h 56m
2026-06-29 DHK036 - Jun 29, 16:50 UTCJun 30, 16:45 UTC23h 55m
2026-06-29 DHK036 - Jun 29, 14:44 UTCJun 29, 20:40 UTC5h 55m
2026-06-29 DHK863A - Jun 29, 12:55 UTCJun 29, 13:09 UTC15m
2026-06-29 DHK863A - Jun 29, 06:19 UTCJun 29, 11:10 UTC4h 50m
2026-06-29 DHK863A EMA → EMA Jun 29, 06:05 UTCJun 29, 06:09 UTC5m
2026-06-29 DHK304 LEJ → EMA Jun 29, 00:34 UTCJun 29, 01:55 UTC1h 20m
2026-06-28 DHK304 - Jun 28, 13:00 UTCJun 28, 20:59 UTC8h 0m
2026-06-28 DHK316 LEJ → CVG Jun 28, 01:59 UTCJun 28, 10:39 UTC8h 40m
2026-06-27 DHK812 - Jun 27, 14:45 UTCJun 27, 18:35 UTC3h 50m
2026-06-27 DHK812 - Jun 27, 12:50 UTCJun 27, 13:04 UTC15m
2026-06-27 DHK036 - Jun 27, 11:00 UTCJun 27, 11:20 UTC20m
2026-06-27 DHK036 - Jun 27, 05:04 UTCJun 27, 09:15 UTC4h 10m
2026-06-27 DHK036 BRU → BRU Jun 27, 04:44 UTCJun 27, 04:49 UTC5m

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?
No active broadcast right now. Last signal was 6h ago.
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, DHK3998, DHK4SM, DHK3999.