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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
Broadcasting now · callsign KLM810 · 36,050 ft
Flights observed
211
Distinct callsigns
20
Country
NL
Last broadcast
Jul 26, 21:45 UTC

Current position

4851AF is currently broadcasting. Map zoomed to live position.

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 KLM Royal Dutch Airlines 27 2026-07-25
KLM810 KLM Royal Dutch Airlines 22 2026-07-25
KLM898 KLM Royal Dutch Airlines 15 2026-07-24
KLM897 KLM Royal Dutch Airlines 12 2026-07-24
KLM808 KLM Royal Dutch Airlines 12 2026-07-22
KLM751 - 12 2026-06-14
KLM896 - 10 2026-07-14
KLM807 - 10 2026-07-21
KLM755 KLM Royal Dutch Airlines 10 2026-07-22
KLM856 - 8 2026-07-01
KLM855 - 8 2026-07-01
KLM895 - 6 2026-07-14
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
2026-07-26 KLM192 IAH → AMS Jul 26, 20:40 UTCJul 26, 21:45 UTC1h 5m
2026-07-26 KLM661 AMS → IAH Jul 26, 08:20 UTCJul 26, 18:10 UTC9h 50m
2026-07-25 KLM810 KUL → AMS Jul 25, 16:40 UTCJul 26, 04:40 UTC12h 0m
2026-07-25 KLM810 KUL → AMS Jul 25, 12:55 UTCJul 25, 14:40 UTC1h 45m
2026-07-25 KLM809 AMS → KUL Jul 25, 09:20 UTCJul 25, 10:50 UTC1h 30m
2026-07-24 KLM809 AMS → KUL Jul 24, 19:30 UTCJul 25, 07:20 UTC11h 50m
2026-07-24 KLM898 PEK → AMS Jul 24, 10:05 UTCJul 24, 14:50 UTC4h 45m
2026-07-24 KLM897 AMS → PEK Jul 24, 00:10 UTCJul 24, 00:35 UTC25m
2026-07-23 KLM897 AMS → PEK Jul 23, 14:30 UTCJul 23, 18:30 UTC4h 0m
2026-07-22 KLM755 GYE → AMS Jul 22, 16:05 UTCJul 23, 11:05 UTC19h 0m
2026-07-22 KLM755 GYE → AMS Jul 22, 03:50 UTCJul 23, 02:30 UTC22h 40m
2026-07-22 KLM808 TPE → AMS Jul 22, 01:50 UTCJul 23, 01:40 UTC23h 50m
2026-07-22 KLM808 TPE → AMS Jul 22, 01:20 UTCJul 22, 18:25 UTC17h 5m
2026-07-21 KLM808 TPE → AMS Jul 21, 16:25 UTCJul 22, 05:25 UTC13h 0m
2026-07-21 KLM808 TPE → AMS Jul 21, 12:25 UTCJul 21, 14:10 UTC1h 45m
2026-07-21 KLM807 TPE → MNL Jul 21, 08:25 UTCJul 21, 10:35 UTC2h 10m
2026-07-20 KLM807 - Jul 20, 18:40 UTCJul 21, 06:45 UTC12h 4m
2026-07-19 KLM808 TPE → AMS Jul 19, 16:15 UTCJul 20, 05:50 UTC13h 35m
2026-07-19 KLM808 TPE → AMS Jul 19, 12:35 UTCJul 19, 14:15 UTC1h 40m
2026-07-19 KLM807 TPE → MNL Jul 19, 08:15 UTCJul 19, 10:10 UTC1h 55m
2026-07-18 KLM807 AMS → TPE Jul 18, 18:35 UTCJul 19, 06:35 UTC12h 0m
2026-07-17 KLM755 - Jul 17, 18:19 UTCJul 18, 10:50 UTC16h 31m
2026-07-17 KLM755 - Jul 17, 09:50 UTCJul 18, 09:45 UTC23h 56m
2026-07-17 KLM755 - Jul 17, 08:40 UTCJul 18, 03:15 UTC18h 36m
2026-07-16 KLM810 KUL → AMS Jul 16, 16:25 UTCJul 17, 04:35 UTC12h 10m
2026-07-16 KLM810 - Jul 16, 12:44 UTCJul 16, 14:25 UTC1h 40m
2026-07-16 KLM809 - Jul 16, 09:25 UTCJul 16, 10:59 UTC1h 35m
2026-07-15 KLM809 - Jul 15, 19:35 UTCJul 16, 07:30 UTC11h 55m
2026-07-14 KLM896 - Jul 14, 23:15 UTCJul 15, 17:05 UTC17h 50m
2026-07-14 KLM896 - Jul 14, 15:50 UTCJul 15, 15:45 UTC23h 54m
2026-07-14 KLM895 - Jul 14, 13:55 UTCJul 15, 05:40 UTC15h 44m
2026-07-13 KLM192 - Jul 13, 20:50 UTCJul 14, 05:55 UTC9h 5m
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

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?
Yes. Mode-S 4851AF is currently airborne.
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, KLM897, KLM808.