Apparatus

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sensors Mode-S transponder

49C20A

ICAO 24-bit transponder address · allocated to Czech Republic

Currently assigned to OK-MUU49

Hex
49C20A
Octal
22341012
Decimal
4,833,802
Country
CZ
Tail
OK-MUU49
Type
ALTO
No current signal · last broadcast 4d ago
Flights observed
72
Distinct callsigns
2
Country
CZ
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S 49C20A.

Country allocation

The ICAO 24-bit address 49C20A falls within the block assigned to Czech Republic (CZ) by ICAO Annex 10, Volume III. Every aircraft registered in Czech Republic 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 2 distinct

Callsign Airline Flights Last seen
CIMSK - 46 2026-07-13
OKMUU49 - 26 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CIMSK - Jul 13, 15:15 UTCJul 13, 15:50 UTC35m
2026-07-12 CIMSK - Jul 12, 15:40 UTCJul 12, 15:55 UTC15m
2026-07-12 CIMSK - Jul 12, 13:25 UTCJul 12, 13:35 UTC10m
2026-07-10 CIMSK - Jul 10, 16:55 UTCJul 10, 17:20 UTC25m
2026-07-10 CIMSK - Jul 10, 15:40 UTCJul 10, 16:05 UTC25m
2026-07-08 CIMSK - Jul 8, 13:20 UTCJul 8, 14:20 UTC1h 0m
2026-07-07 CIMSK - Jul 7, 18:40 UTCJul 7, 18:50 UTC10m
2026-07-06 CIMSK - Jul 6, 18:25 UTCJul 6, 18:50 UTC25m
2026-07-02 CIMSK - Jul 2, 14:20 UTCJul 2, 14:35 UTC15m
2026-07-01 CIMSK - Jul 1, 16:35 UTCJul 1, 17:00 UTC25m
2026-07-01 CIMSK - Jul 1, 15:15 UTCJul 1, 15:50 UTC35m
2026-06-26 CIMSK - Jun 26, 20:55 UTCJun 26, 21:30 UTC35m
2026-06-24 CIMSK - Jun 24, 13:34 UTCJun 24, 14:15 UTC40m
2026-06-23 CIMSK - Jun 23, 16:20 UTCJun 23, 16:29 UTC10m
2026-06-22 CIMSK - Jun 22, 15:59 UTCJun 22, 16:14 UTC15m
2026-06-22 CIMSK - Jun 22, 14:40 UTCJun 22, 14:55 UTC15m
2026-06-19 CIMSK - Jun 19, 16:44 UTCJun 19, 16:59 UTC15m
2026-06-19 CIMSK - Jun 19, 15:34 UTCJun 19, 15:49 UTC15m
2026-06-19 CIMSK - Jun 19, 14:09 UTCJun 19, 14:34 UTC25m
2026-06-16 OKMUU49 - Jun 16, 14:55 UTCJun 16, 16:50 UTC1h 55m
2026-06-16 OKMUU49 - Jun 16, 06:50 UTCJun 16, 13:40 UTC6h 50m
2026-06-16 OKMUU49 - Jun 16, 03:35 UTCJun 16, 05:00 UTC1h 25m
2026-06-15 OKMUU49 - Jun 15, 11:05 UTCJun 15, 11:19 UTC15m
2026-06-12 OKMUU49 - Jun 12, 11:05 UTCJun 12, 11:25 UTC20m
2026-06-12 OKMUU49 - Jun 12, 09:00 UTCJun 12, 09:15 UTC15m
2026-06-12 OKMUU49 - Jun 12, 08:05 UTCJun 12, 08:25 UTC20m
2026-06-11 OKMUU49 - Jun 11, 09:10 UTCJun 11, 10:05 UTC55m
2026-06-10 OKMUU49 - Jun 10, 12:00 UTCJun 10, 13:25 UTC1h 25m
2026-06-08 CIMSK - Jun 8, 15:40 UTCJun 8, 16:00 UTC20m
2026-06-08 CIMSK - Jun 8, 13:55 UTCJun 8, 14:15 UTC20m
2026-06-08 OKMUU49 - Jun 8, 10:10 UTCJun 8, 10:45 UTC35m
2026-06-08 OKMUU49 - Jun 8, 04:45 UTCJun 8, 08:25 UTC3h 40m
2026-06-07 CIMSK - Jun 7, 19:45 UTCJun 7, 19:55 UTC10m
2026-06-07 CIMSK - Jun 7, 18:00 UTCJun 7, 18:30 UTC30m
2026-06-07 CIMSK - Jun 7, 16:40 UTCJun 7, 16:55 UTC15m
2026-06-04 OKMUU49 - Jun 4, 11:15 UTCJun 4, 11:30 UTC15m
2026-06-02 OKMUU49 - Jun 2, 11:15 UTCJun 2, 12:25 UTC1h 10m
2026-06-01 OKMUU49 - Jun 1, 15:55 UTCJun 1, 17:40 UTC1h 45m
2026-06-01 CIMSK - Jun 1, 14:35 UTCJun 1, 14:50 UTC15m
2026-05-31 CIMSK - May 31, 16:35 UTCMay 31, 17:05 UTC30m
2026-05-31 CIMSK - May 31, 12:55 UTCMay 31, 13:30 UTC35m
2026-05-28 CIMSK - May 28, 17:30 UTCMay 28, 17:45 UTC15m
2026-05-28 CIMSK - May 28, 16:00 UTCMay 28, 16:15 UTC15m
2026-05-28 CIMSK - May 28, 14:50 UTCMay 28, 15:05 UTC15m
2026-05-26 CIMSK - May 26, 14:05 UTCMay 26, 14:40 UTC35m
2026-05-25 CIMSK - May 25, 16:45 UTCMay 25, 17:10 UTC25m
2026-05-19 CIMSK - May 19, 15:40 UTCMay 19, 16:15 UTC35m
2026-05-18 OKMUU49 - May 18, 12:10 UTCMay 18, 12:35 UTC25m
2026-05-18 OKMUU49 - May 18, 11:35 UTCMay 18, 11:50 UTC15m
2026-05-17 CIMSK - May 17, 15:40 UTCMay 17, 15:55 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 OK-MUU49 page for operator, model, and routing details .

Mode-S 49C20A frequently asked

What is Mode-S code 49C20A?
49C20A is an ICAO 24-bit transponder address. Allocated to Czech Republic. Assigned to OK-MUU49.
Where is Mode-S 49C20A registered?
Mode-S code 49C20A is allocated to Czech Republic (CZ). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 49C20A broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 49C20A, octal 22341012, decimal 4,833,802.
What flights does 49C20A operate?
Mode-S 49C20A has broadcast 2 distinct callsigns, including CIMSK, OKMUU49.