Apparatus

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sensors Mode-S transponder

49D644

ICAO 24-bit transponder address · allocated to Czech Republic

Hex
49D644
Octal
22353104
Decimal
4,838,980
Country
CZ
No current signal · last broadcast Jul 19, 10:25 UTC
Flights observed
94
Distinct callsigns
1
Country
CZ
Last broadcast
Jul 19, 10:25 UTC

Last known position

Most recent position reported by Mode-S 49D644.

Country allocation

The ICAO 24-bit address 49D644 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 1 distinct

Callsign Airline Flights Last seen
OKTCM - 94 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-19 OKTCM - Jul 19, 09:45 UTCJul 19, 10:25 UTC40m
2026-07-19 OKTCM - Jul 19, 08:30 UTCJul 19, 08:40 UTC10m
2026-07-18 OKTCM - Jul 18, 15:20 UTCJul 18, 15:35 UTC15m
2026-07-18 OKTCM - Jul 18, 13:35 UTCJul 18, 14:10 UTC35m
2026-07-18 OKTCM - Jul 18, 10:45 UTCJul 18, 12:45 UTC2h 0m
2026-07-17 OKTCM - Jul 17, 16:55 UTCJul 17, 18:19 UTC1h 25m
2026-07-16 OKTCM - Jul 16, 10:45 UTCJul 16, 12:20 UTC1h 35m
2026-07-12 OKTCM JCL → BTS Jul 12, 14:35 UTCJul 12, 15:55 UTC1h 20m
2026-07-12 OKTCM - Jul 12, 07:05 UTCJul 12, 08:35 UTC1h 30m
2026-07-11 OKTCM - Jul 11, 13:05 UTCJul 11, 13:15 UTC10m
2026-07-11 OKTCM - Jul 11, 11:40 UTCJul 11, 12:05 UTC25m
2026-07-11 OKTCM - Jul 11, 09:50 UTCJul 11, 10:50 UTC1h 0m
2026-07-11 OKTCM - Jul 11, 08:15 UTCJul 11, 09:10 UTC55m
2026-07-11 OKTCM - Jul 11, 07:30 UTCJul 11, 07:40 UTC10m
2026-07-10 OKTCM - Jul 10, 20:55 UTCJul 10, 21:20 UTC25m
2026-07-09 OKTCM - Jul 9, 09:00 UTCJul 9, 10:45 UTC1h 45m
2026-07-08 OKTCM - Jul 8, 05:40 UTCJul 8, 07:05 UTC1h 25m
2026-07-07 OKTCM - Jul 7, 15:40 UTCJul 7, 17:55 UTC2h 15m
2026-07-07 OKTCM - Jul 7, 13:20 UTCJul 7, 14:00 UTC40m
2026-07-07 OKTCM - Jul 7, 04:00 UTCJul 7, 05:25 UTC1h 25m
2026-07-06 OKTCM - Jul 6, 14:50 UTCJul 6, 15:10 UTC20m
2026-07-05 OKTCM - Jul 5, 13:40 UTCJul 5, 13:50 UTC10m
2026-07-05 OKTCM - Jul 5, 06:20 UTCJul 5, 07:35 UTC1h 15m
2026-07-04 OKTCM - Jul 4, 12:25 UTCJul 4, 14:00 UTC1h 35m
2026-07-04 OKTCM - Jul 4, 07:55 UTCJul 4, 10:10 UTC2h 15m
2026-07-03 OKTCM - Jul 3, 14:15 UTCJul 3, 16:05 UTC1h 50m
2026-07-03 OKTCM - Jul 3, 06:35 UTCJul 3, 07:20 UTC45m
2026-07-02 OKTCM - Jul 2, 17:50 UTCJul 2, 18:05 UTC15m
2026-06-30 OKTCM - Jun 30, 07:55 UTCJun 30, 08:05 UTC10m
2026-06-25 OKTCM - Jun 25, 10:35 UTCJun 25, 10:45 UTC10m
2026-06-25 OKTCM - Jun 25, 09:34 UTCJun 25, 09:50 UTC15m
2026-06-25 OKTCM - Jun 25, 07:39 UTCJun 25, 08:40 UTC1h 0m
2026-06-23 OKTCM - Jun 23, 17:15 UTCJun 23, 18:29 UTC1h 15m
2026-06-23 OKTCM - Jun 23, 09:24 UTCJun 23, 09:34 UTC10m
2026-06-22 OKTCM - Jun 22, 05:15 UTCJun 22, 06:39 UTC1h 25m
2026-06-21 OKTCM - Jun 21, 09:10 UTCJun 21, 09:35 UTC25m
2026-06-21 OKTCM - Jun 21, 07:25 UTCJun 21, 07:45 UTC20m
2026-06-19 OKTCM BTS → BTS Jun 19, 09:30 UTCJun 19, 10:24 UTC55m
2026-06-19 OKTCM - Jun 19, 07:29 UTCJun 19, 08:14 UTC45m
2026-06-17 OKTCM - Jun 17, 12:00 UTCJun 17, 14:10 UTC2h 10m
2026-06-17 OKTCM - Jun 17, 07:15 UTCJun 17, 09:55 UTC2h 40m
2026-06-15 OKTCM - Jun 15, 09:35 UTCJun 15, 12:30 UTC2h 55m
2026-06-15 OKTCM - Jun 15, 08:40 UTCJun 15, 08:49 UTC10m
2026-06-14 OKTCM - Jun 14, 11:15 UTCJun 14, 13:30 UTC2h 15m
2026-06-11 OKTCM - Jun 11, 16:55 UTCJun 11, 18:40 UTC1h 45m
2026-06-06 OKTCM - Jun 6, 08:50 UTCJun 6, 09:34 UTC45m
2026-06-03 OKTCM - Jun 3, 13:25 UTCJun 3, 13:35 UTC10m
2026-06-02 OKTCM - Jun 2, 18:40 UTCJun 2, 19:20 UTC40m
2026-06-02 OKTCM - Jun 2, 17:05 UTCJun 2, 17:30 UTC25m
2026-06-02 OKTCM - Jun 2, 15:45 UTCJun 2, 16:05 UTC20m

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.

Mode-S 49D644 frequently asked

What is Mode-S code 49D644?
49D644 is an ICAO 24-bit transponder address. Allocated to Czech Republic.
Where is Mode-S 49D644 registered?
Mode-S code 49D644 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 49D644 broadcasting right now?
No active broadcast right now. Last signal was Jul 19, 10:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 49D644, octal 22353104, decimal 4,838,980.
What flights does 49D644 operate?
Mode-S 49D644 has broadcast 1 distinct callsign, including OKTCM.