Apparatus

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sensors Mode-S transponder

49C3E9

ICAO 24-bit transponder address · allocated to Czech Republic

Hex
49C3E9
Octal
22341751
Decimal
4,834,281
Country
CZ
No current signal · last broadcast 1d ago
Flights observed
63
Distinct callsigns
1
Country
CZ
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 49C3E9.

Country allocation

The ICAO 24-bit address 49C3E9 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
OKDUO79 - 63 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 OKDUO79 - Jul 26, 08:35 UTCJul 26, 09:55 UTC1h 20m
2026-07-26 OKDUO79 - Jul 26, 07:25 UTCJul 26, 07:40 UTC15m
2026-07-25 OKDUO79 - Jul 25, 10:40 UTCJul 25, 10:55 UTC15m
2026-07-23 OKDUO79 - Jul 23, 18:00 UTCJul 23, 18:45 UTC45m
2026-07-23 OKDUO79 - Jul 23, 04:30 UTCJul 23, 05:15 UTC45m
2026-07-21 OKDUO79 - Jul 21, 11:55 UTCJul 21, 13:55 UTC2h 0m
2026-07-20 OKDUO79 - Jul 20, 17:35 UTCJul 20, 18:25 UTC50m
2026-07-19 OKDUO79 - Jul 19, 18:10 UTCJul 19, 19:00 UTC50m
2026-07-19 OKDUO79 - Jul 19, 06:05 UTCJul 19, 06:40 UTC35m
2026-07-18 OKDUO79 - Jul 18, 09:55 UTCJul 18, 10:15 UTC20m
2026-07-18 OKDUO79 - Jul 18, 08:25 UTCJul 18, 09:20 UTC55m
2026-07-17 OKDUO79 - Jul 17, 16:49 UTCJul 17, 18:00 UTC1h 10m
2026-07-15 OKDUO79 - Jul 15, 17:25 UTCJul 15, 17:35 UTC10m
2026-07-15 OKDUO79 - Jul 15, 14:45 UTCJul 15, 16:55 UTC2h 10m
2026-07-04 OKDUO79 - Jul 4, 06:20 UTCJul 4, 06:35 UTC15m
2026-07-03 OKDUO79 - Jul 3, 12:15 UTCJul 3, 12:35 UTC20m
2026-07-03 OKDUO79 - Jul 3, 11:00 UTCJul 3, 11:20 UTC20m
2026-06-30 OKDUO79 - Jun 30, 17:50 UTCJun 30, 18:30 UTC40m
2026-06-30 OKDUO79 - Jun 30, 16:00 UTCJun 30, 16:45 UTC45m
2026-06-30 OKDUO79 - Jun 30, 15:20 UTCJun 30, 15:30 UTC10m
2026-06-27 OKDUO79 - Jun 27, 05:10 UTCJun 27, 05:19 UTC10m
2026-06-24 OKDUO79 - Jun 24, 07:24 UTCJun 24, 09:24 UTC2h 0m
2026-06-23 OKDUO79 - Jun 23, 09:24 UTCJun 23, 10:35 UTC1h 10m
2026-06-22 OKDUO79 - Jun 22, 11:44 UTCJun 22, 12:44 UTC1h 0m
2026-06-22 OKDUO79 - Jun 22, 08:44 UTCJun 22, 11:00 UTC2h 15m
2026-06-20 OKDUO79 - Jun 20, 13:44 UTCJun 20, 14:29 UTC45m
2026-06-20 OKDUO79 - Jun 20, 06:14 UTCJun 20, 07:00 UTC45m
2026-06-19 OKDUO79 - Jun 19, 06:54 UTCJun 19, 09:30 UTC2h 35m
2026-06-18 OKDUO79 - Jun 18, 16:55 UTCJun 18, 19:15 UTC2h 20m
2026-06-08 OKDUO79 - Jun 8, 15:50 UTCJun 8, 16:05 UTC15m
2026-06-08 OKDUO79 - Jun 8, 07:25 UTCJun 8, 09:00 UTC1h 35m
2026-06-06 OKDUO79 - Jun 6, 17:34 UTCJun 6, 18:25 UTC50m
2026-06-06 OKDUO79 - Jun 6, 16:20 UTCJun 6, 16:55 UTC35m
2026-06-06 OKDUO79 - Jun 6, 15:10 UTCJun 6, 15:30 UTC20m
2026-06-06 OKDUO79 - Jun 6, 12:14 UTCJun 6, 12:30 UTC15m
2026-06-02 OKDUO79 - Jun 2, 16:50 UTCJun 2, 18:40 UTC1h 50m
2026-05-29 OKDUO79 - May 29, 18:25 UTCMay 29, 18:45 UTC20m
2026-05-29 OKDUO79 - May 29, 17:20 UTCMay 29, 17:55 UTC35m
2026-05-29 OKDUO79 - May 29, 15:05 UTCMay 29, 16:10 UTC1h 5m
2026-05-28 OKDUO79 - May 28, 15:40 UTCMay 28, 18:40 UTC3h 0m
2026-05-27 OKDUO79 - May 27, 17:40 UTCMay 27, 18:40 UTC1h 0m
2026-05-26 OKDUO79 - May 26, 16:35 UTCMay 26, 18:24 UTC1h 50m
2026-05-25 OKDUO79 - May 25, 18:10 UTCMay 25, 18:20 UTC10m
2026-05-25 OKDUO79 - May 25, 16:35 UTCMay 25, 17:10 UTC35m
2026-05-25 OKDUO79 - May 25, 14:00 UTCMay 25, 15:35 UTC1h 35m
2026-05-23 OKDUO79 - May 23, 10:45 UTCMay 23, 11:00 UTC15m
2026-05-22 OKDUO79 - May 22, 17:05 UTCMay 22, 18:05 UTC1h 0m
2026-05-22 OKDUO79 - May 22, 13:55 UTCMay 22, 15:00 UTC1h 5m
2026-05-20 OKDUO79 - May 20, 06:45 UTCMay 20, 06:55 UTC10m
2026-05-16 OKDUO79 - May 16, 16:40 UTCMay 16, 17:15 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.

Mode-S 49C3E9 frequently asked

What is Mode-S code 49C3E9?
49C3E9 is an ICAO 24-bit transponder address. Allocated to Czech Republic.
Where is Mode-S 49C3E9 registered?
Mode-S code 49C3E9 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 49C3E9 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 49C3E9, octal 22341751, decimal 4,834,281.
What flights does 49C3E9 operate?
Mode-S 49C3E9 has broadcast 1 distinct callsign, including OKDUO79.