Apparatus

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sensors Mode-S transponder

4841C3

ICAO 24-bit transponder address · allocated to Netherlands

Currently assigned to PH-CKA · BOEING 747-400

Hex
4841C3
Octal
22040703
Decimal
4,735,427
Country
NL
Tail
PH-CKA
Type
B744
No current signal · last broadcast 11h ago
Flights observed
97
Distinct callsigns
20
Country
NL
Last broadcast
11h ago

Last known position

Most recent position reported by Mode-S 4841C3.

Country allocation

The ICAO 24-bit address 4841C3 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
MPH6142 Martinair 9 2026-05-15
MPH6141 Martinair 7 2026-05-14
MPH9451 Martinair 6 2026-05-16
MPH8372 Martinair 6 2026-05-25
MPH6162 Martinair 6 2026-05-24
MPH6161 Martinair 6 2026-05-23
MPH6122 Martinair 6 2026-05-13
MPH6121 Martinair 6 2026-05-12
MPH9441 Martinair 5 2026-05-29
MPH8371 Martinair 5 2026-05-24
MPH8322 Martinair 5 2026-05-27
MPH9462 Martinair 4 2026-05-03
MPH9442 Martinair 4 2026-05-29
MPH8321 Martinair 4 2026-05-26
MPH9452 Martinair 3 2026-05-16
MPH9432 Martinair 3 2026-05-21
MPH8342 Martinair 3 2026-05-23
MPH9461 Martinair 2 2026-05-02
MPH9431 - 2 2026-05-20
MPH8341 Martinair 2 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 MPH9442 DWC → AMS May 29, 05:00 UTCMay 29, 20:45 UTC15h 45m
2026-05-29 MPH9441 AMS → AMS May 29, 01:35 UTCMay 29, 02:05 UTC30m
2026-05-28 MPH9441 AMS → AMS May 28, 14:25 UTCMay 28, 18:25 UTC4h 0m
2026-05-27 MPH8322 NBO → AMS May 27, 10:15 UTCMay 27, 10:40 UTC25m
2026-05-26 MPH8321 AMS → AMS May 26, 21:25 UTCMay 27, 07:50 UTC10h 26m
2026-05-25 MPH8372 NBO → AMS May 25, 10:30 UTCMay 25, 10:55 UTC25m
2026-05-24 MPH8371 AMS → JNB May 24, 21:25 UTCMay 25, 07:30 UTC10h 5m
2026-05-24 MPH6162 STN → AMS May 24, 07:40 UTCMay 24, 15:45 UTC8h 5m
2026-05-24 MPH6162 STN → AMS May 24, 04:35 UTCMay 24, 05:05 UTC30m
2026-05-24 MPH6162 STN → AMS May 24, 02:05 UTCMay 24, 02:15 UTC10m
2026-05-23 MPH6161 MIA → BOG May 23, 23:00 UTCMay 23, 23:15 UTC15m
2026-05-23 MP6161 MIA → BOG May 23, 20:20 UTCMay 23, 20:45 UTC25m
2026-05-23 MPH6161 MIA → BOG May 23, 09:15 UTCMay 23, 18:20 UTC9h 6m
2026-05-23 MPH8342 NBO → AMS May 23, 01:10 UTCMay 23, 03:00 UTC1h 49m
2026-05-22 MPH8342 NBO → AMS May 22, 11:35 UTCMay 22, 12:00 UTC25m
2026-05-21 MPH8341 AMS → JNB May 21, 22:45 UTCMay 22, 08:40 UTC9h 55m
2026-05-21 MPH9432 ICN → HKG May 21, 15:15 UTCMay 21, 19:30 UTC4h 15m
2026-05-21 MPH9432 ICN → HKG May 21, 05:15 UTCMay 21, 05:35 UTC20m
2026-05-21 MPH9432 ICN → HKG May 21, 00:05 UTCMay 21, 03:00 UTC2h 55m
2026-05-20 MPH9431 - May 20, 21:40 UTCMay 20, 22:00 UTC20m
2026-05-20 MPH9431 - May 20, 11:00 UTCMay 20, 21:00 UTC10h 0m
2026-05-20 MPH9172 HHN → HHN May 20, 07:05 UTCMay 20, 07:50 UTC45m
2026-05-17 MPH9171 AMS → HHN May 17, 18:35 UTCMay 17, 19:10 UTC35m
2026-05-16 MPH9452 HKG → DWC May 16, 22:30 UTCMay 17, 02:55 UTC4h 25m
2026-05-16 MPH9452 HKG → DWC May 16, 10:50 UTCMay 16, 11:05 UTC15m
2026-05-16 MPH9451 AMS → HKG May 16, 05:00 UTCMay 16, 05:20 UTC20m
2026-05-15 MPH9451 AMS → HKG May 15, 17:50 UTCMay 15, 22:00 UTC4h 10m
2026-05-15 MPH6142 MIA → AMS May 15, 06:55 UTCMay 15, 14:30 UTC7h 35m
2026-05-15 MPH6142 MIA → AMS May 15, 03:50 UTCMay 15, 04:25 UTC35m
2026-05-15 MPH6142 MIA → AMS May 15, 01:30 UTCMay 15, 01:40 UTC10m
2026-05-14 MPH6141 GUA → BOG May 14, 23:00 UTCMay 14, 23:20 UTC20m
2026-05-14 MPH6141 GUA → BOG May 14, 20:20 UTCMay 14, 20:45 UTC25m
2026-05-14 MPH6141 GUA → BOG May 14, 08:20 UTCMay 14, 18:00 UTC9h 40m
2026-05-13 MPH6122 MIA → AMS May 13, 07:35 UTCMay 13, 15:50 UTC8h 15m
2026-05-12 MPH6122 MIA → AMS May 12, 21:15 UTCMay 13, 05:50 UTC8h 35m
2026-05-12 MPH6121 AMS → MIA May 12, 09:05 UTCMay 12, 18:35 UTC9h 30m
2026-05-11 MPH8372 NBO → AMS May 11, 10:35 UTCMay 11, 11:00 UTC25m
2026-05-10 MPH8371 AMS → JNB May 10, 21:30 UTCMay 11, 07:55 UTC10h 25m
2026-05-10 MPH6162 STN → AMS May 10, 07:15 UTCMay 10, 15:19 UTC8h 5m
2026-05-10 MPH6162 STN → AMS May 10, 04:34 UTCMay 10, 05:10 UTC35m
2026-05-09 MPH6161 MIA → BOG May 9, 21:05 UTCMay 9, 21:30 UTC25m
2026-05-09 MPH6161 MIA → BOG May 9, 09:45 UTCMay 9, 19:00 UTC9h 15m
2026-05-08 MPH9442 DWC → AMS May 8, 07:59 UTCMay 8, 19:35 UTC11h 35m
2026-05-08 MPH9441 AMS → AMS May 8, 05:09 UTCMay 8, 05:49 UTC40m
2026-05-07 MPH9441 AMS → AMS May 7, 17:50 UTCMay 7, 20:25 UTC2h 35m
2026-05-07 MPH8322 NBO → AMS May 7, 09:20 UTCMay 7, 13:45 UTC4h 25m
2026-05-06 MPH8322 NBO → AMS May 6, 10:10 UTCMay 6, 10:35 UTC25m
2026-05-05 MPH8321 AMS → AMS May 5, 20:55 UTCMay 6, 07:20 UTC10h 25m
2026-05-03 MPH9462 ALA → AMS May 3, 14:25 UTCMay 3, 18:50 UTC4h 25m
2026-05-03 MPH9462 ALA → AMS May 3, 03:40 UTCMay 3, 03:55 UTC15m

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

Mode-S 4841C3 frequently asked

What is Mode-S code 4841C3?
4841C3 is an ICAO 24-bit transponder address. Allocated to Netherlands. Assigned to PH-CKA.
Where is Mode-S 4841C3 registered?
Mode-S code 4841C3 is allocated to Netherlands (NL). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4841C3 broadcasting right now?
No active broadcast right now. Last signal was 11h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4841C3, octal 22040703, decimal 4,735,427.
What flights does 4841C3 operate?
Mode-S 4841C3 has broadcast 20 distinct callsigns, including MPH6142, MPH6141, MPH9451, MPH8372, MPH6162.