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 2h ago
Flights observed
103
Distinct callsigns
20
Country
GB
Last broadcast
2h 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
DHK2507 DHL Air 7 2026-05-29
DHK2506 DHL Air 6 2026-05-29
DHK800 DHL Air 5 2026-05-03
DHK842 DHL Air 4 2026-05-29
DHK811 DHL Air 4 2026-05-10
DHK453 DHL Air 4 2026-05-28
DHK3998 DHL Air 4 2026-05-28
DHK038 - 4 2026-05-12
DHK037 - 4 2026-05-14
DHK812 DHL Air 3 2026-05-16
DHK3999 DHL Air 3 2026-05-28
DHK376 DHL Air 3 2026-05-29
DHK891 DHL Air 2 2026-05-23
DHK839 DHL Air 2 2026-05-25
DHK817 DHL Air 2 2026-05-02
DHK7LK DHL Air 2 2026-05-27
DHK508P - 2 2026-04-17
DHK4AW DHL Air 2 2026-05-22
DHK4911 DHL Air 2 2026-05-26
DHK4904 DHL Air 2 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 DHK376 LHR → CVG May 29, 22:25 UTCMay 29, 23:55 UTC1h 30m
2026-05-29 DHK2507 BFS → EMA May 29, 19:15 UTCMay 29, 19:55 UTC40m
2026-05-29 DHK803P LEJ → EMA May 29, 17:05 UTCMay 29, 17:45 UTC40m
2026-05-29 DHK802P EMA → LEJ May 29, 06:55 UTCMay 29, 07:35 UTC40m
2026-05-29 DHK2506 EMA → BFS May 29, 04:35 UTCMay 29, 05:15 UTC40m
2026-05-29 DHK842 BRU → EMA May 29, 01:05 UTCMay 29, 01:50 UTC45m
2026-05-28 DHK453 EMA → BRU May 28, 22:20 UTCMay 28, 23:10 UTC50m
2026-05-28 DHK3999 KEF → EMA May 28, 17:20 UTCMay 28, 19:45 UTC2h 25m
2026-05-28 DHK3998 LEJ → KEF May 28, 05:40 UTCMay 28, 08:05 UTC2h 25m
2026-05-28 DHK4SM LEJ → EMA May 28, 01:35 UTCMay 28, 03:00 UTC1h 25m
2026-05-27 DHK7LK EMA → LEJ May 27, 22:00 UTCMay 27, 23:30 UTC1h 30m
2026-05-27 DHK2507 BFS → EMA May 27, 19:15 UTCMay 27, 19:55 UTC40m
2026-05-27 DHK2506 EMA → BFS May 27, 04:19 UTCMay 27, 05:04 UTC45m
2026-05-26 DHK019 LEJ → HKG May 26, 23:49 UTCMay 27, 00:44 UTC55m
2026-05-26 DHK4911 BSL → LEJ May 26, 20:54 UTCMay 26, 21:55 UTC1h 0m
2026-05-26 DHK4904 LEJ → BSL May 26, 02:49 UTCMay 26, 03:40 UTC50m
2026-05-25 DHK840 OSL → LEJ May 25, 08:45 UTCMay 25, 10:05 UTC1h 20m
2026-05-25 DHK839 EMA → LEJ May 25, 04:45 UTCMay 25, 06:20 UTC1h 35m
2026-05-25 DHK839 EMA → LEJ May 25, 01:55 UTCMay 25, 02:05 UTC10m
2026-05-24 DHK866 CVG → EMA May 24, 02:05 UTCMay 24, 17:20 UTC15h 15m
2026-05-24 DHK895 LEJ → ALA May 24, 00:05 UTCMay 24, 00:20 UTC15m
2026-05-23 DHK891 LEJ → EMA May 23, 21:20 UTCMay 23, 21:55 UTC35m
2026-05-23 DHK891 LEJ → EMA May 23, 04:40 UTCMay 23, 19:20 UTC14h 40m
2026-05-22 DHK036 EMA → ALA May 22, 22:25 UTCMay 22, 23:15 UTC50m
2026-05-22 DHK3997 KEF → LEJ May 22, 17:25 UTCMay 22, 19:45 UTC2h 20m
2026-05-22 DHK3998 LEJ → KEF May 22, 04:50 UTCMay 22, 07:05 UTC2h 15m
2026-05-22 DHK4AW LEJ → EMA May 22, 00:20 UTCMay 22, 01:45 UTC1h 25m
2026-05-21 DHK4911 BSL → LEJ May 21, 20:55 UTCMay 21, 21:50 UTC55m
2026-05-21 DHK4904 LEJ → BSL May 21, 02:55 UTCMay 21, 03:45 UTC50m
2026-05-20 DHK7LK EMA → LEJ May 20, 22:00 UTCMay 20, 23:20 UTC1h 20m
2026-05-20 DHK3999 KEF → EMA May 20, 16:50 UTCMay 20, 19:00 UTC2h 10m
2026-05-20 DHK3998 LEJ → KEF May 20, 04:35 UTCMay 20, 06:55 UTC2h 21m
2026-05-20 DHK4AW LEJ → EMA May 20, 00:00 UTCMay 20, 01:25 UTC1h 25m
2026-05-19 DHK56W EMA → LEJ May 19, 19:50 UTCMay 19, 21:10 UTC1h 20m
2026-05-19 DHK369 CVG → LEJ May 19, 12:00 UTCMay 19, 18:20 UTC6h 20m
2026-05-19 DHK368 EMA → CVG May 19, 01:25 UTCMay 19, 08:00 UTC6h 35m
2026-05-18 DHK2507 BFS → EMA May 18, 19:25 UTCMay 18, 20:05 UTC40m
2026-05-18 DHK2506 EMA → BFS May 18, 02:40 UTCMay 18, 03:20 UTC40m
2026-05-17 DHK868 CVG → EMA May 17, 19:01 UTCMay 17, 19:45 UTC45m
2026-05-17 DHK841 EMA → BRU May 17, 15:40 UTCMay 17, 16:30 UTC50m
2026-05-16 DHK812 LEJ → BAH May 16, 23:15 UTCMay 17, 00:40 UTC1h 25m
2026-05-16 DHK819 LEJ → CVG May 16, 18:30 UTCMay 16, 19:50 UTC1h 20m
2026-05-16 DHK452 BRU → EMA May 16, 11:21 UTCMay 16, 12:16 UTC55m
2026-05-16 DHK453 EMA → BRU May 16, 07:55 UTCMay 16, 08:46 UTC50m
2026-05-15 DHK035 LEJ → EMA May 15, 22:35 UTCMay 15, 23:20 UTC45m
2026-05-15 DHK378 CVG → BRU May 15, 12:30 UTCMay 15, 20:10 UTC7h 39m
2026-05-14 DHK845 BRU → CVG May 14, 18:55 UTCMay 15, 03:10 UTC8h 15m
2026-05-14 DHK037 - May 14, 01:20 UTCMay 14, 06:15 UTC4h 55m
2026-05-12 DHK038 - May 12, 06:55 UTCMay 12, 19:50 UTC12h 55m
2026-05-11 DHK038 EMA → BRU May 11, 21:40 UTCMay 11, 22:35 UTC54m

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 2h 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 DHK2507, DHK2506, DHK800, DHK842, DHK811.