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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
Broadcasting now · callsign MPH6121 · 34,000 ft
Flights observed
200
Distinct callsigns
20
Country
NL
Last broadcast
19h ago

Current position

4841C4 is currently broadcasting. Map zoomed to live position.

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
MPH9462 - 22 2026-06-28
MPH9412 - 18 2026-06-30
MPH9432 - 15 2026-07-02
MPH6141 - 14 2026-07-10
MPH9461 - 12 2026-06-27
MPH9411 - 12 2026-06-29
MPH6142 - 11 2026-07-10
MPH6121 - 10 2026-07-07
MPH9442 Martinair 9 2026-06-19
MPH9431 - 8 2026-07-01
MPH6122 - 8 2026-07-08
MPH9441 Martinair 7 2026-06-19
MPH8322 Martinair 6 2026-06-17
MPH6162 Martinair 6 2026-06-14
MPH6161 Martinair 6 2026-06-13
MPH9472 - 5 2026-07-06
MPH8321 Martinair 5 2026-06-16
MPH9471 - 4 2026-07-06
MPH8372 - 4 2026-07-13
MPH8342 Martinair 4 2026-05-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 MPH8372 - Jul 13, 22:20 UTCJul 14, 02:50 UTC4h 30m
2026-07-13 MPH8372 - Jul 13, 12:10 UTCJul 13, 12:35 UTC25m
2026-07-12 MPH8371 - Jul 12, 23:10 UTCJul 13, 09:25 UTC10h 15m
2026-07-10 MPH6142 - Jul 10, 10:10 UTCJul 10, 18:30 UTC8h 20m
2026-07-10 MPH6142 BOG → MIA Jul 10, 03:50 UTCJul 10, 07:00 UTC3h 10m
2026-07-10 MPH6141 - Jul 10, 01:00 UTCJul 10, 01:15 UTC15m
2026-07-09 MPH6141 - Jul 9, 22:20 UTCJul 9, 22:40 UTC20m
2026-07-09 MPH6141 - Jul 9, 10:50 UTCJul 9, 19:40 UTC8h 50m
2026-07-08 MPH6122 MIA → AMS Jul 8, 19:00 UTCJul 9, 03:20 UTC8h 20m
2026-07-07 MPH6121 - Jul 7, 21:00 UTCJul 8, 05:50 UTC8h 50m
2026-07-06 MPH9472 - Jul 6, 19:15 UTCJul 6, 19:30 UTC15m
2026-07-06 MPH9472 - Jul 6, 14:50 UTCJul 6, 16:00 UTC1h 10m
2026-07-06 MPH9472 - Jul 6, 06:55 UTCJul 6, 07:10 UTC15m
2026-07-06 MPH9471 - Jul 6, 03:15 UTCJul 6, 04:00 UTC45m
2026-07-05 MPH9471 - Jul 5, 16:35 UTCJul 5, 19:10 UTC2h 35m
2026-07-04 MPH7352 - Jul 4, 12:45 UTCJul 4, 23:35 UTC10h 50m
2026-07-03 MPH7351 - Jul 3, 21:05 UTCJul 4, 08:25 UTC11h 20m
2026-07-02 MPH9432 - Jul 2, 11:25 UTCJul 2, 16:05 UTC4h 40m
2026-07-02 MPH9432 - Jul 2, 03:30 UTCJul 2, 03:50 UTC20m
2026-07-02 MPH9432 - Jul 2, 00:05 UTCJul 2, 00:20 UTC15m
2026-07-01 MPH9432 - Jul 1, 21:25 UTCJul 1, 23:30 UTC2h 5m
2026-07-01 MPH9431 - Jul 1, 18:45 UTCJul 1, 19:05 UTC20m
2026-07-01 MPH9431 - Jul 1, 07:45 UTCJul 1, 18:05 UTC10h 20m
2026-06-30 MPH9412 - Jun 30, 11:35 UTCJun 30, 16:10 UTC4h 35m
2026-06-30 MPH9412 - Jun 30, 03:25 UTCJun 30, 03:45 UTC20m
2026-06-29 MPH9412 ICN → HKG Jun 29, 21:14 UTCJun 30, 00:09 UTC2h 55m
2026-06-29 MPH9411 - Jun 29, 18:44 UTCJun 29, 19:05 UTC20m
2026-06-29 MPH9411 - Jun 29, 08:04 UTCJun 29, 18:05 UTC10h 0m
2026-06-28 MPH9462 - Jun 28, 17:00 UTCJun 28, 18:14 UTC1h 15m
2026-06-28 MPH9462 - Jun 28, 08:44 UTCJun 28, 08:59 UTC15m
2026-06-27 MPH9462 - Jun 27, 23:39 UTCJun 27, 23:55 UTC15m
2026-06-27 MPH9462 - Jun 27, 20:49 UTCJun 27, 23:04 UTC2h 15m
2026-06-27 MPH9461 - Jun 27, 18:04 UTCJun 27, 18:29 UTC25m
2026-06-27 MPH9461 - Jun 27, 07:34 UTCJun 27, 17:25 UTC9h 50m
2026-06-26 MPH6142 - Jun 26, 09:05 UTCJun 26, 17:00 UTC7h 55m
2026-06-26 MPH6142 - Jun 26, 06:04 UTCJun 26, 06:35 UTC30m
2026-06-25 MPH6141 - Jun 25, 22:20 UTCJun 25, 22:39 UTC20m
2026-06-25 MPH6141 - Jun 25, 10:59 UTCJun 25, 20:05 UTC9h 5m
2026-06-23 MPH6122 - Jun 23, 22:10 UTCJun 24, 06:20 UTC8h 10m
2026-06-23 MPH6121 AMS → MIA Jun 23, 14:15 UTCJun 23, 16:35 UTC2h 20m
2026-06-22 MPH6121 AMS → MIA Jun 22, 09:49 UTCJun 22, 12:05 UTC2h 15m
2026-06-21 MPH9462 ALA → AMS Jun 21, 14:15 UTCJun 21, 16:59 UTC2h 45m
2026-06-21 MPH9462 ALA → AMS Jun 21, 03:30 UTCJun 21, 03:44 UTC15m
2026-06-20 MPH9462 ALA → AMS Jun 20, 23:50 UTCJun 21, 00:10 UTC20m
2026-06-20 MPH9462 ALA → AMS Jun 20, 21:10 UTCJun 20, 23:14 UTC2h 5m
2026-06-20 MPH9461 DWC → HKG Jun 20, 18:40 UTCJun 20, 19:04 UTC25m
2026-06-20 MPH9461 DWC → HKG Jun 20, 08:09 UTCJun 20, 18:04 UTC9h 55m
2026-06-19 MPH9442 DWC → AMS Jun 19, 16:59 UTCJun 19, 21:34 UTC4h 35m
2026-06-19 MPH9442 DWC → AMS Jun 19, 06:44 UTCJun 19, 06:59 UTC15m
2026-06-19 MPH9441 AMS → AMS Jun 19, 00:10 UTCJun 19, 00:45 UTC35m

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?
Yes. Mode-S 4841C4 is currently airborne.
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 MPH9462, MPH9412, MPH9432, MPH6141, MPH9461.