Apparatus

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sensors Mode-S transponder

4841C4

ICAO 24-bit transponder address · allocated to Netherlands

Currently assigned to PH-CKB · BOEING 747-400

Hex
4841C4
Octal
22040704
Decimal
4,735,428
Country
NL
Tail
PH-CKB
Type
B744
No current signal · last broadcast 1d ago
Flights observed
118
Distinct callsigns
20
Country
NL
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4841C4.

Country allocation

The ICAO 24-bit address 4841C4 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
MPH9412 Martinair 12 2026-05-19
MPH9462 Martinair 10 2026-05-17
MPH6141 Martinair 9 2026-05-29
MPH9411 Martinair 8 2026-05-18
MPH9432 Martinair 7 2026-05-14
MPH6142 Martinair 7 2026-05-29
MPH6121 Martinair 7 2026-05-26
MPH9461 Martinair 6 2026-05-16
MPH6122 Martinair 6 2026-05-27
MPH9442 Martinair 5 2026-04-17
MPH9441 - 4 2026-04-16
MPH9431 - 4 2026-05-13
MPH8342 Martinair 4 2026-05-16
MPH8322 Martinair 4 2026-05-20
MPH8321 Martinair 4 2026-05-19
MPH6162 Martinair 4 2026-05-03
MPH6161 Martinair 4 2026-05-02
MPH8341 Martinair 3 2026-05-14
MPH9472 - 2 2026-05-25
MPH9471 Martinair 2 2026-05-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 MPH6142 MIA → AMS May 29, 08:30 UTCMay 29, 16:15 UTC7h 45m
2026-05-29 MPH6142 MIA → AMS May 29, 04:00 UTCMay 29, 07:00 UTC3h 0m
2026-05-29 MPH6141 GUA → BOG May 29, 01:25 UTCMay 29, 01:45 UTC20m
2026-05-28 MPH6141 GUA → BOG May 28, 22:50 UTCMay 28, 23:10 UTC20m
2026-05-28 MPH6141 GUA → BOG May 28, 07:50 UTCMay 28, 16:50 UTC9h 0m
2026-05-27 MPH6122 MIA → AMS May 27, 06:55 UTCMay 27, 15:15 UTC8h 20m
2026-05-27 MPH6122 MIA → AMS May 27, 04:19 UTCMay 27, 04:55 UTC35m
2026-05-26 MPH6121 AMS → MIA May 26, 21:00 UTCMay 26, 21:20 UTC20m
2026-05-26 MPH6121 AMS → MIA May 26, 09:55 UTCMay 26, 18:55 UTC9h 0m
2026-05-25 MPH9472 - May 25, 16:20 UTCMay 25, 20:50 UTC4h 30m
2026-05-25 MPH9472 - May 25, 06:35 UTCMay 25, 06:50 UTC15m
2026-05-25 MPH9471 AMS → DWC May 25, 03:20 UTCMay 25, 03:50 UTC30m
2026-05-24 MPH9471 AMS → DWC May 24, 16:20 UTCMay 24, 18:55 UTC2h 35m
2026-05-23 MPH9452 HKG → DWC May 23, 19:05 UTCMay 23, 23:25 UTC4h 20m
2026-05-23 MPH9452 HKG → DWC May 23, 08:50 UTCMay 23, 09:05 UTC15m
2026-05-23 MPH9451 AMS → HKG May 23, 04:45 UTCMay 23, 05:20 UTC35m
2026-05-22 MPH9451 AMS → HKG May 22, 17:45 UTCMay 22, 20:15 UTC2h 30m
2026-05-22 MPH6142 MIA → AMS May 22, 06:10 UTCMay 22, 14:00 UTC7h 50m
2026-05-22 MPH6142 MIA → AMS May 22, 03:35 UTCMay 22, 04:10 UTC35m
2026-05-22 MPH6142 MIA → AMS May 22, 01:05 UTCMay 22, 01:15 UTC10m
2026-05-21 MPH6141 GUA → BOG May 21, 21:50 UTCMay 21, 22:10 UTC20m
2026-05-21 MPH6141 GUA → BOG May 21, 19:05 UTCMay 21, 19:30 UTC25m
2026-05-21 MPH6141 GUA → BOG May 21, 07:40 UTCMay 21, 16:45 UTC9h 5m
2026-05-20 MPH8322 NBO → AMS May 20, 10:35 UTCMay 20, 11:00 UTC25m
2026-05-19 MPH8321 AMS → AMS May 19, 22:00 UTCMay 20, 08:05 UTC10h 6m
2026-05-19 MPH9412 DWC → AMS May 19, 14:00 UTCMay 19, 18:30 UTC4h 30m
2026-05-19 MPH9412 DWC → AMS May 19, 03:55 UTCMay 19, 04:10 UTC15m
2026-05-18 MPH9412 DWC → AMS May 18, 21:10 UTCMay 19, 00:05 UTC2h 55m
2026-05-18 MPH9411 DWC → HKG May 18, 18:50 UTCMay 18, 19:05 UTC15m
2026-05-18 MPH9411 DWC → HKG May 18, 07:50 UTCMay 18, 18:05 UTC10h 15m
2026-05-17 MPH9462 ALA → AMS May 17, 03:20 UTCMay 17, 18:25 UTC15h 5m
2026-05-16 MPH9462 ALA → AMS May 16, 23:30 UTCMay 16, 23:50 UTC20m
2026-05-16 MPH9462 ALA → AMS May 16, 20:55 UTCMay 16, 22:55 UTC2h 0m
2026-05-16 MPH9461 DWC → HKG May 16, 18:05 UTCMay 16, 18:30 UTC25m
2026-05-16 MPH9461 DWC → HKG May 16, 07:11 UTCMay 16, 11:16 UTC4h 5m
2026-05-16 MPH8342 NBO → AMS May 16, 01:00 UTCMay 16, 03:05 UTC2h 5m
2026-05-15 MPH8342 NBO → AMS May 15, 12:00 UTCMay 15, 12:25 UTC25m
2026-05-14 MPH8341 AMS → JNB May 14, 22:55 UTCMay 15, 09:05 UTC10h 10m
2026-05-14 MPH9432 ICN → HKG May 14, 03:45 UTCMay 14, 18:35 UTC14h 50m
2026-05-14 MPH9432 ICN → HKG May 14, 00:20 UTCMay 14, 00:30 UTC10m
2026-05-13 MPH9432 ICN → HKG May 13, 21:30 UTCMay 13, 23:45 UTC2h 15m
2026-05-13 MPH9431 - May 13, 18:45 UTCMay 13, 19:10 UTC25m
2026-05-13 MPH9431 - May 13, 08:00 UTCMay 13, 11:50 UTC3h 50m
2026-05-12 MPH9412 DWC → AMS May 12, 09:55 UTCMay 13, 00:40 UTC14h 45m
2026-05-12 MPH9412 DWC → AMS May 12, 04:15 UTCMay 12, 07:20 UTC3h 5m
2026-05-11 MPH9411 DWC → HKG May 11, 14:00 UTCMay 11, 16:30 UTC2h 30m
2026-05-10 MPH9462 ALA → AMS May 10, 14:40 UTCMay 10, 19:24 UTC4h 45m
2026-05-10 MPH9462 ALA → AMS May 10, 04:39 UTCMay 10, 04:55 UTC15m
2026-05-10 MPH9462 ALA → AMS May 10, 02:00 UTCMay 10, 02:24 UTC25m
2026-05-09 MPH9462 ALA → AMS May 9, 23:15 UTCMay 10, 01:24 UTC2h 10m

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-CKB page for operator, model, and routing details .

Mode-S 4841C4 frequently asked

What is Mode-S code 4841C4?
4841C4 is an ICAO 24-bit transponder address. Allocated to Netherlands. Assigned to PH-CKB.
Where is Mode-S 4841C4 registered?
Mode-S code 4841C4 is allocated to Netherlands (NL). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4841C4 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4841C4, octal 22040704, decimal 4,735,428.
What flights does 4841C4 operate?
Mode-S 4841C4 has broadcast 20 distinct callsigns, including MPH9412, MPH9462, MPH6141, MPH9411, MPH9432.