Apparatus

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sensors Mode-S transponder

49D6A1

ICAO 24-bit transponder address · allocated to Czech Republic

Hex
49D6A1
Octal
22353241
Decimal
4,839,073
Country
CZ
No current signal · last broadcast 2h ago
Flights observed
57
Distinct callsigns
1
Country
CZ
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 49D6A1.

Country allocation

The ICAO 24-bit address 49D6A1 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
OKAPT - 57 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 OKAPT - Jul 11, 18:30 UTCJul 11, 18:40 UTC10m
2026-07-11 OKAPT - Jul 11, 05:40 UTCJul 11, 06:30 UTC50m
2026-07-10 OKAPT - Jul 10, 14:45 UTCJul 10, 15:25 UTC40m
2026-07-10 OKAPT - Jul 10, 09:15 UTCJul 10, 09:40 UTC25m
2026-07-09 OKAPT UHE → UHE Jul 9, 06:30 UTCJul 9, 06:45 UTC15m
2026-07-09 OKAPT - Jul 9, 05:25 UTCJul 9, 05:45 UTC20m
2026-07-08 OKAPT - Jul 8, 17:25 UTCJul 8, 18:10 UTC45m
2026-06-30 OKAPT - Jun 30, 17:10 UTCJun 30, 17:55 UTC45m
2026-06-29 OKAPT - Jun 29, 09:34 UTCJun 29, 10:40 UTC1h 5m
2026-06-29 OKAPT - Jun 29, 07:44 UTCJun 29, 08:50 UTC1h 5m
2026-06-27 OKAPT - Jun 27, 13:00 UTCJun 27, 15:19 UTC2h 20m
2026-06-27 OKAPT GRZ → POW Jun 27, 10:25 UTCJun 27, 11:44 UTC1h 20m
2026-06-27 OKAPT - Jun 27, 08:10 UTCJun 27, 09:34 UTC1h 25m
2026-06-24 OKAPT - Jun 24, 17:20 UTCJun 24, 18:44 UTC1h 25m
2026-06-23 OKAPT - Jun 23, 12:20 UTCJun 23, 13:15 UTC55m
2026-06-23 OKAPT - Jun 23, 08:30 UTCJun 23, 09:14 UTC45m
2026-06-21 OKAPT - Jun 21, 18:14 UTCJun 21, 18:29 UTC15m
2026-06-21 OKAPT - Jun 21, 17:20 UTCJun 21, 17:39 UTC20m
2026-06-15 OKAPT - Jun 15, 16:24 UTCJun 15, 18:04 UTC1h 40m
2026-06-14 OKAPT - Jun 14, 16:30 UTCJun 14, 17:20 UTC50m
2026-06-13 OKAPT - Jun 13, 16:45 UTCJun 13, 17:00 UTC15m
2026-06-13 OKAPT - Jun 13, 16:00 UTCJun 13, 16:15 UTC15m
2026-06-08 OKAPT - Jun 8, 17:30 UTCJun 8, 18:00 UTC30m
2026-06-08 OKAPT - Jun 8, 16:20 UTCJun 8, 17:00 UTC40m
2026-06-07 OKAPT - Jun 7, 15:55 UTCJun 7, 16:30 UTC35m
2026-06-07 OKAPT - Jun 7, 14:05 UTCJun 7, 14:35 UTC30m
2026-06-07 OKAPT - Jun 7, 12:35 UTCJun 7, 12:55 UTC20m
2026-06-07 OKAPT - Jun 7, 11:50 UTCJun 7, 12:20 UTC30m
2026-06-07 OKAPT - Jun 7, 10:00 UTCJun 7, 11:05 UTC1h 5m
2026-06-06 OKAPT - Jun 6, 10:45 UTCJun 6, 11:09 UTC25m
2026-06-06 OKAPT - Jun 6, 08:15 UTCJun 6, 09:30 UTC1h 15m
2026-06-06 OKAPT - Jun 6, 07:20 UTCJun 6, 07:45 UTC25m
2026-06-05 OKAPT - Jun 5, 06:25 UTCJun 5, 06:45 UTC20m
2026-06-04 OKAPT - Jun 4, 16:40 UTCJun 4, 17:55 UTC1h 15m
2026-06-04 OKAPT - Jun 4, 14:40 UTCJun 4, 15:10 UTC30m
2026-06-04 OKAPT - Jun 4, 12:45 UTCJun 4, 13:15 UTC30m
2026-06-04 OKAPT - Jun 4, 09:30 UTCJun 4, 10:10 UTC40m
2026-06-04 OKAPT - Jun 4, 07:35 UTCJun 4, 08:25 UTC50m
2026-06-02 OKAPT - Jun 2, 13:45 UTCJun 2, 15:30 UTC1h 45m
2026-05-31 OKAPT - May 31, 15:25 UTCMay 31, 16:35 UTC1h 10m
2026-05-31 OKAPT - May 31, 11:40 UTCMay 31, 12:10 UTC30m
2026-05-30 OKAPT - May 30, 15:15 UTCMay 30, 16:45 UTC1h 30m
2026-05-30 OKAPT - May 30, 13:40 UTCMay 30, 14:40 UTC1h 0m
2026-05-30 OKAPT - May 30, 05:25 UTCMay 30, 07:35 UTC2h 10m
2026-05-29 OKAPT - May 29, 17:15 UTCMay 29, 18:20 UTC1h 5m
2026-05-29 OKAPT - May 29, 12:25 UTCMay 29, 13:25 UTC1h 0m
2026-05-29 OKAPT - May 29, 10:25 UTCMay 29, 11:30 UTC1h 5m
2026-05-28 OKAPT - May 28, 14:25 UTCMay 28, 15:45 UTC1h 20m
2026-05-28 OKAPT - May 28, 12:20 UTCMay 28, 12:30 UTC10m
2026-05-28 OKAPT - May 28, 10:30 UTCMay 28, 10:40 UTC10m

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 49D6A1 frequently asked

What is Mode-S code 49D6A1?
49D6A1 is an ICAO 24-bit transponder address. Allocated to Czech Republic.
Where is Mode-S 49D6A1 registered?
Mode-S code 49D6A1 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 49D6A1 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 49D6A1, octal 22353241, decimal 4,839,073.
What flights does 49D6A1 operate?
Mode-S 49D6A1 has broadcast 1 distinct callsign, including OKAPT.