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 13d ago
Flights observed
158
Distinct callsigns
20
Country
NL
Last broadcast
13d 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 14 2026-06-12
MPH9451 - 13 2026-06-27
MPH6141 Martinair 12 2026-06-11
MPH9452 - 11 2026-06-27
MPH6121 Martinair 11 2026-06-16
MPH6122 Martinair 10 2026-06-16
MPH9432 - 9 2026-06-25
MPH8372 Martinair 8 2026-06-01
MPH6161 Martinair 8 2026-05-30
MPH6162 Martinair 7 2026-05-31
MPH9431 - 6 2026-06-24
MPH8371 Martinair 6 2026-05-31
MPH9472 - 5 2026-06-22
MPH9471 - 5 2026-06-22
MPH9441 Martinair 5 2026-05-29
MPH8322 Martinair 5 2026-05-27
MPH9462 Martinair 4 2026-05-03
MPH9442 Martinair 4 2026-05-29
MPH8321 Martinair 4 2026-05-26
MPH8342 Martinair 3 2026-05-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-30 MPH9161 - Jun 30, 09:35 UTCJun 30, 19:35 UTC10h 0m
2026-06-27 MPH9452 - Jun 27, 21:04 UTCJun 28, 01:25 UTC4h 20m
2026-06-27 MPH9452 - Jun 27, 10:54 UTCJun 27, 11:09 UTC15m
2026-06-27 MPH9451 - Jun 27, 07:55 UTCJun 27, 08:29 UTC35m
2026-06-26 MPH9451 - Jun 26, 21:35 UTCJun 27, 01:24 UTC3h 50m
2026-06-25 MPH9432 - Jun 25, 13:59 UTCJun 25, 15:04 UTC1h 5m
2026-06-25 MPH9432 - Jun 25, 03:34 UTCJun 25, 03:50 UTC15m
2026-06-24 MPH9432 ICN → HKG Jun 24, 21:04 UTCJun 24, 23:54 UTC2h 50m
2026-06-24 MPH9431 - Jun 24, 18:05 UTCJun 24, 18:25 UTC20m
2026-06-24 MPH9431 - Jun 24, 07:40 UTCJun 24, 17:25 UTC9h 45m
2026-06-22 MPH9472 HKG → AMS Jun 22, 05:40 UTCJun 22, 21:00 UTC15h 20m
2026-06-22 MPH9471 - Jun 22, 02:50 UTCJun 22, 03:30 UTC40m
2026-06-21 MPH9471 AMS → DWC Jun 21, 15:59 UTCJun 21, 18:44 UTC2h 45m
2026-06-20 MPH9452 HKG → DWC Jun 20, 19:09 UTCJun 20, 23:55 UTC4h 45m
2026-06-20 MPH9452 HKG → DWC Jun 20, 08:19 UTCJun 20, 08:34 UTC15m
2026-06-19 MPH9451 - Jun 19, 18:09 UTCJun 19, 20:59 UTC2h 50m
2026-06-18 MPH9432 - Jun 18, 15:20 UTCJun 18, 19:50 UTC4h 30m
2026-06-18 MPH9432 - Jun 18, 04:40 UTCJun 18, 04:55 UTC15m
2026-06-17 MPH9432 - Jun 17, 21:10 UTCJun 18, 00:00 UTC2h 50m
2026-06-17 MPH9431 - Jun 17, 18:25 UTCJun 17, 18:45 UTC20m
2026-06-17 MPH9431 - Jun 17, 07:35 UTCJun 17, 11:35 UTC4h 0m
2026-06-16 MPH6122 MIA → AMS Jun 16, 19:50 UTCJun 17, 03:35 UTC7h 45m
2026-06-16 MPH6121 AMS → MIA Jun 16, 07:45 UTCJun 16, 17:05 UTC9h 20m
2026-06-15 MPH9472 - Jun 15, 17:40 UTCJun 15, 18:50 UTC1h 10m
2026-06-15 MPH9472 - Jun 15, 07:25 UTCJun 15, 07:40 UTC15m
2026-06-14 MPH9471 AMS → DWC Jun 14, 16:10 UTCJun 15, 03:40 UTC11h 30m
2026-06-13 MPH9452 HKG → DWC Jun 13, 19:15 UTCJun 14, 00:05 UTC4h 50m
2026-06-13 MPH9452 HKG → DWC Jun 13, 08:10 UTCJun 13, 08:25 UTC15m
2026-06-13 MPH9451 AMS → HKG Jun 13, 04:30 UTCJun 13, 05:00 UTC30m
2026-06-12 MPH9451 AMS → HKG Jun 12, 17:45 UTCJun 12, 21:40 UTC3h 55m
2026-06-12 MPH6142 MIA → AMS Jun 12, 06:10 UTCJun 12, 14:05 UTC7h 55m
2026-06-12 MPH6142 MIA → AMS Jun 12, 03:45 UTCJun 12, 04:25 UTC40m
2026-06-12 MPH6142 MIA → AMS Jun 12, 01:20 UTCJun 12, 01:30 UTC10m
2026-06-11 MPH6141 GUA → BOG Jun 11, 22:50 UTCJun 11, 23:05 UTC15m
2026-06-11 MPH6141 GUA → BOG Jun 11, 20:15 UTCJun 11, 20:35 UTC20m
2026-06-11 MPH6141 GUA → BOG Jun 11, 08:45 UTCJun 11, 18:00 UTC9h 15m
2026-06-09 MPH6122 MIA → AMS Jun 9, 22:50 UTCJun 10, 07:00 UTC8h 10m
2026-06-09 MPH6121 AMS → MIA Jun 9, 10:45 UTCJun 9, 19:55 UTC9h 10m
2026-06-08 MPH9472 - Jun 8, 17:20 UTCJun 8, 21:55 UTC4h 35m
2026-06-08 MPH9472 - Jun 8, 06:45 UTCJun 8, 07:00 UTC15m
2026-06-08 MPH9471 AMS → DWC Jun 8, 02:45 UTCJun 8, 03:15 UTC30m
2026-06-07 MPH9471 AMS → DWC Jun 7, 15:55 UTCJun 7, 19:50 UTC3h 55m
2026-06-06 MPH9452 HKG → DWC Jun 6, 19:10 UTCJun 6, 20:25 UTC1h 15m
2026-06-06 MPH9452 HKG → DWC Jun 6, 08:30 UTCJun 6, 08:45 UTC15m
2026-06-06 MPH9451 AMS → HKG Jun 6, 05:20 UTCJun 6, 06:00 UTC40m
2026-06-05 MPH9451 AMS → HKG Jun 5, 18:25 UTCJun 5, 21:05 UTC2h 40m
2026-06-05 MPH6142 MIA → AMS Jun 5, 07:25 UTCJun 5, 15:00 UTC7h 35m
2026-06-05 MPH6142 MIA → AMS Jun 5, 02:20 UTCJun 5, 05:15 UTC2h 55m
2026-06-04 MPH6141 GUA → BOG Jun 4, 20:05 UTCJun 4, 20:30 UTC25m
2026-06-04 MPH6141 GUA → BOG Jun 4, 08:25 UTCJun 4, 17:40 UTC9h 15m

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 13d 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, MPH9451, MPH6141, MPH9452, MPH6121.