Apparatus

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sensors Mode-S transponder

49C4A1

ICAO 24-bit transponder address · allocated to Czech Republic

Hex
49C4A1
Octal
22342241
Decimal
4,834,465
Country
CZ
No current signal · last broadcast 13h ago
Flights observed
124
Distinct callsigns
1
Country
CZ
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S 49C4A1.

Country allocation

The ICAO 24-bit address 49C4A1 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
OKFUA39 - 124 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 OKFUA39 - Jul 13, 17:05 UTCJul 13, 18:20 UTC1h 15m
2026-07-13 OKFUA39 - Jul 13, 07:30 UTCJul 13, 08:15 UTC45m
2026-07-12 OKFUA39 - Jul 12, 16:20 UTCJul 12, 17:35 UTC1h 15m
2026-07-12 OKFUA39 - Jul 12, 14:30 UTCJul 12, 15:01 UTC30m
2026-07-12 OKFUA39 - Jul 12, 12:25 UTCJul 12, 13:15 UTC50m
2026-07-11 OKFUA39 - Jul 11, 13:30 UTCJul 11, 16:20 UTC2h 50m
2026-07-08 OKFUA39 - Jul 8, 15:55 UTCJul 8, 16:45 UTC50m
2026-07-06 OKFUA39 - Jul 6, 11:40 UTCJul 6, 12:25 UTC45m
2026-07-05 OKFUA39 - Jul 5, 10:20 UTCJul 5, 10:35 UTC15m
2026-07-05 OKFUA39 - Jul 5, 07:45 UTCJul 5, 08:40 UTC55m
2026-07-05 OKFUA39 - Jul 5, 06:10 UTCJul 5, 06:30 UTC20m
2026-07-03 OKFUA39 - Jul 3, 09:30 UTCJul 3, 10:20 UTC50m
2026-07-03 OKFUA39 - Jul 3, 07:55 UTCJul 3, 08:40 UTC45m
2026-07-03 OKFUA39 - Jul 3, 06:45 UTCJul 3, 07:05 UTC20m
2026-07-02 OKFUA39 - Jul 2, 16:35 UTCJul 2, 18:30 UTC1h 55m
2026-07-02 OKFUA39 - Jul 2, 06:30 UTCJul 2, 07:10 UTC40m
2026-06-30 OKFUA39 - Jun 30, 18:00 UTCJun 30, 18:50 UTC50m
2026-06-30 OKFUA39 - Jun 30, 16:00 UTCJun 30, 17:00 UTC1h 0m
2026-06-29 OKFUA39 - Jun 29, 05:30 UTCJun 29, 06:34 UTC1h 5m
2026-06-28 OKFUA39 - Jun 28, 04:55 UTCJun 28, 05:20 UTC25m
2026-06-25 OKFUA39 - Jun 25, 17:34 UTCJun 25, 18:50 UTC1h 15m
2026-06-24 OKFUA39 - Jun 24, 14:09 UTCJun 24, 15:39 UTC1h 30m
2026-06-23 OKFUA39 - Jun 23, 09:14 UTCJun 23, 10:10 UTC55m
2026-06-23 OKFUA39 - Jun 23, 06:34 UTCJun 23, 08:25 UTC1h 50m
2026-06-22 OKFUA39 - Jun 22, 17:04 UTCJun 22, 18:19 UTC1h 15m
2026-06-21 OKFUA39 - Jun 21, 09:20 UTCJun 21, 09:40 UTC20m
2026-06-21 OKFUA39 - Jun 21, 08:25 UTCJun 21, 08:49 UTC25m
2026-06-21 OKFUA39 - Jun 21, 06:35 UTCJun 21, 07:45 UTC1h 10m
2026-06-20 OKFUA39 - Jun 20, 19:04 UTCJun 20, 19:24 UTC20m
2026-06-18 OKFUA39 - Jun 18, 09:25 UTCJun 18, 09:45 UTC20m
2026-06-18 OKFUA39 - Jun 18, 06:55 UTCJun 18, 08:50 UTC1h 55m
2026-06-17 OKFUA39 - Jun 17, 17:15 UTCJun 17, 18:25 UTC1h 10m
2026-06-17 OKFUA39 - Jun 17, 14:05 UTCJun 17, 16:05 UTC2h 0m
2026-06-17 OKFUA39 - Jun 17, 11:50 UTCJun 17, 12:55 UTC1h 5m
2026-06-17 OKFUA39 - Jun 17, 08:55 UTCJun 17, 10:30 UTC1h 35m
2026-06-16 OKFUA39 - Jun 16, 14:50 UTCJun 16, 16:30 UTC1h 40m
2026-06-14 OKFUA39 - Jun 14, 06:00 UTCJun 14, 07:00 UTC1h 0m
2026-06-12 OKFUA39 - Jun 12, 17:05 UTCJun 12, 17:55 UTC50m
2026-06-12 OKFUA39 - Jun 12, 13:35 UTCJun 12, 16:05 UTC2h 30m
2026-06-12 OKFUA39 - Jun 12, 07:10 UTCJun 12, 08:05 UTC55m
2026-06-02 OKFUA39 - Jun 2, 15:50 UTCJun 2, 18:10 UTC2h 20m
2026-06-01 OKFUA39 - Jun 1, 15:15 UTCJun 1, 18:05 UTC2h 50m
2026-05-31 OKFUA39 - May 31, 08:25 UTCMay 31, 11:20 UTC2h 55m
2026-05-30 OKFUA39 - May 30, 15:15 UTCMay 30, 19:15 UTC4h 0m
2026-05-30 OKFUA39 - May 30, 14:45 UTCMay 30, 15:00 UTC15m
2026-05-30 OKFUA39 - May 30, 12:50 UTCMay 30, 13:15 UTC25m
2026-05-29 OKFUA39 - May 29, 13:35 UTCMay 29, 14:25 UTC50m
2026-05-29 OKFUA39 - May 29, 10:00 UTCMay 29, 10:25 UTC25m
2026-05-29 OKFUA39 - May 29, 07:55 UTCMay 29, 08:40 UTC45m
2026-05-28 OKFUA39 - May 28, 16:30 UTCMay 28, 17:35 UTC1h 5m

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 49C4A1 frequently asked

What is Mode-S code 49C4A1?
49C4A1 is an ICAO 24-bit transponder address. Allocated to Czech Republic.
Where is Mode-S 49C4A1 registered?
Mode-S code 49C4A1 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 49C4A1 broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 49C4A1, octal 22342241, decimal 4,834,465.
What flights does 49C4A1 operate?
Mode-S 49C4A1 has broadcast 1 distinct callsign, including OKFUA39.