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sensors Mode-S transponder

4851AF

ICAO 24-bit transponder address · allocated to Netherlands

Currently assigned to PH-BHD · BOEING 787-9 Dreamliner

Hex
4851AF
Octal
22050657
Decimal
4,739,503
Country
NL
Tail
PH-BHD
Type
B789
No current signal · last broadcast 1h ago
Flights observed
180
Distinct callsigns
20
Country
NL
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 4851AF.

Country allocation

The ICAO 24-bit address 4851AF falls within the block assigned to Netherlands (NL) by ICAO Annex 10, Volume III. Every aircraft registered in Netherlands 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
KLM809 - 23 2026-07-11
KLM810 - 18 2026-07-11
KLM898 - 14 2026-07-06
KLM751 - 12 2026-06-14
KLM897 - 10 2026-07-06
KLM896 - 8 2026-06-26
KLM856 - 8 2026-07-01
KLM855 - 8 2026-07-01
KLM808 KLM Royal Dutch Airlines 6 2026-05-29
KLM807 KLM Royal Dutch Airlines 6 2026-05-29
KLM895 - 5 2026-06-26
KLM755 - 5 2026-06-21
KLM888 - 4 2026-06-28
KLM759 KLM Royal Dutch Airlines 4 2026-04-13
KLM868 - 3 2026-07-03
KLM867 - 3 2026-07-02
KLM789 - 3 2026-06-17
KLM741 KLM Royal Dutch Airlines 3 2026-06-07
KLM686 KLM Royal Dutch Airlines 3 2026-05-28
KLM685 KLM Royal Dutch Airlines 3 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 KLM192 - Jul 13, 20:50 UTCJul 13, 23:45 UTC2h 55m
2026-07-13 KLM661 - Jul 13, 08:35 UTCJul 13, 18:15 UTC9h 40m
2026-07-11 KLM810 - Jul 11, 16:20 UTCJul 12, 04:45 UTC12h 25m
2026-07-11 KLM810 - Jul 11, 12:50 UTCJul 11, 14:40 UTC1h 50m
2026-07-11 KLM809 - Jul 11, 10:45 UTCJul 11, 11:05 UTC20m
2026-07-11 KLM809 - Jul 11, 09:25 UTCJul 11, 10:10 UTC45m
2026-07-10 KLM809 - Jul 10, 19:35 UTCJul 11, 07:05 UTC11h 30m
2026-07-09 KLM810 - Jul 9, 16:25 UTCJul 10, 04:50 UTC12h 25m
2026-07-09 KLM810 - Jul 9, 12:50 UTCJul 9, 14:25 UTC1h 35m
2026-07-09 KLM809 - Jul 9, 10:40 UTCJul 9, 11:00 UTC20m
2026-07-09 KLM809 - Jul 9, 09:20 UTCJul 9, 10:05 UTC45m
2026-07-08 KLM809 - Jul 8, 19:30 UTCJul 9, 07:15 UTC11h 45m
2026-07-07 KLM810 - Jul 7, 16:35 UTCJul 8, 04:50 UTC12h 15m
2026-07-07 KLM810 - Jul 7, 12:40 UTCJul 7, 14:20 UTC1h 40m
2026-07-07 KLM809 - Jul 7, 09:20 UTCJul 7, 11:00 UTC1h 40m
2026-07-06 KLM809 - Jul 6, 19:35 UTCJul 7, 07:00 UTC11h 25m
2026-07-06 KLM898 - Jul 6, 03:05 UTCJul 6, 14:45 UTC11h 40m
2026-07-06 KLM897 - Jul 6, 00:10 UTCJul 6, 00:30 UTC20m
2026-07-05 KLM897 - Jul 5, 14:40 UTCJul 5, 18:30 UTC3h 50m
2026-07-04 KLM166 AUS → AMS Jul 4, 23:40 UTCJul 5, 08:35 UTC8h 55m
2026-07-04 KLM115 - Jul 4, 11:25 UTCJul 4, 21:05 UTC9h 40m
2026-07-03 KLM868 KIX → AMS Jul 3, 03:30 UTCJul 3, 16:55 UTC13h 25m
2026-07-02 KLM867 AMS → KIX Jul 2, 13:05 UTCJul 3, 01:10 UTC12h 5m
2026-07-01 KLM856 - Jul 1, 14:45 UTCJul 2, 02:20 UTC11h 35m
2026-07-01 KLM856 - Jul 1, 13:40 UTCJul 1, 13:55 UTC15m
2026-07-01 KLM855 - Jul 1, 06:40 UTCJul 1, 07:10 UTC30m
2026-06-30 KLM855 - Jun 30, 19:50 UTCJul 1, 05:45 UTC9h 55m
2026-06-30 KLM868 - Jun 30, 03:20 UTCJun 30, 17:00 UTC13h 40m
2026-06-29 KLM867 AMS → KIX Jun 29, 13:19 UTCJun 30, 01:09 UTC11h 50m
2026-06-28 KLM888 - Jun 28, 17:04 UTCJun 29, 03:44 UTC10h 40m
2026-06-28 KLM888 - Jun 28, 14:54 UTCJun 28, 15:14 UTC20m
2026-06-27 KLM887 - Jun 27, 20:04 UTCJun 28, 07:20 UTC11h 15m
2026-06-26 KLM896 - Jun 26, 23:34 UTCJun 27, 16:59 UTC17h 25m
2026-06-26 KLM896 - Jun 26, 17:50 UTCJun 27, 16:59 UTC23h 10m
2026-06-26 KLM895 - Jun 26, 14:09 UTCJun 27, 05:25 UTC15h 15m
2026-06-25 KLM640 - Jun 25, 20:59 UTCJun 26, 06:54 UTC9h 55m
2026-06-25 KLM639 - Jun 25, 08:14 UTCJun 25, 18:45 UTC10h 30m
2026-06-21 KLM755 - Jun 21, 16:39 UTCJun 22, 10:44 UTC18h 5m
2026-06-21 KLM755 - Jun 21, 09:49 UTCJun 22, 09:45 UTC23h 55m
2026-06-21 KLM755 - Jun 21, 09:00 UTCJun 22, 02:50 UTC17h 50m
2026-06-20 KLM810 - Jun 20, 16:05 UTCJun 21, 04:44 UTC12h 40m
2026-06-20 KLM810 - Jun 20, 12:54 UTCJun 20, 13:44 UTC50m
2026-06-20 KLM809 - Jun 20, 10:49 UTCJun 20, 11:09 UTC20m
2026-06-20 KLM809 - Jun 20, 09:29 UTCJun 20, 10:09 UTC40m
2026-06-20 KLM809 - Jun 20, 07:24 UTCJun 20, 07:44 UTC20m
2026-06-19 KLM809 - Jun 19, 20:09 UTCJun 20, 06:35 UTC10h 25m
2026-06-19 KLM862 - Jun 19, 03:24 UTCJun 19, 16:55 UTC13h 30m
2026-06-18 KLM861 AMS → NRT Jun 18, 12:15 UTCJun 19, 00:55 UTC12h 39m
2026-06-17 KLM789 - Jun 17, 19:45 UTCJun 18, 06:20 UTC10h 35m
2026-06-17 KLM789 - Jun 17, 08:05 UTCJun 18, 05:45 UTC21h 40m

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 PH-BHD page for operator, model, and routing details .

Mode-S 4851AF frequently asked

What is Mode-S code 4851AF?
4851AF is an ICAO 24-bit transponder address. Allocated to Netherlands. Assigned to PH-BHD.
Where is Mode-S 4851AF registered?
Mode-S code 4851AF is allocated to Netherlands (NL). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4851AF broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4851AF, octal 22050657, decimal 4,739,503.
What flights does 4851AF operate?
Mode-S 4851AF has broadcast 20 distinct callsigns, including KLM809, KLM810, KLM898, KLM751, KLM897.