Apparatus

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sensors Mode-S transponder

49D4F1

ICAO 24-bit transponder address · allocated to Czech Republic

Currently assigned to OK-PUL · CIRRUS SR-20

Hex
49D4F1
Octal
22352361
Decimal
4,838,641
Country
CZ
Tail
OK-PUL
Type
SR20
No current signal · last broadcast 1d ago
Flights observed
50
Distinct callsigns
1
Country
CZ
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 49D4F1.

Country allocation

The ICAO 24-bit address 49D4F1 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
OKPUL - 50 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-16 OKPUL - Jul 16, 13:49 UTCJul 16, 14:05 UTC15m
2026-07-16 OKPUL - Jul 16, 12:14 UTCJul 16, 13:10 UTC55m
2026-07-16 OKPUL - Jul 16, 10:45 UTCJul 16, 11:40 UTC55m
2026-07-16 OKPUL - Jul 16, 08:45 UTCJul 16, 09:25 UTC40m
2026-07-15 OKPUL - Jul 15, 12:25 UTCJul 15, 13:50 UTC1h 25m
2026-07-14 OKPUL - Jul 14, 10:25 UTCJul 14, 11:55 UTC1h 30m
2026-07-10 OKPUL - Jul 10, 13:30 UTCJul 10, 14:45 UTC1h 15m
2026-07-10 OKPUL - Jul 10, 09:35 UTCJul 10, 10:20 UTC45m
2026-07-08 OKPUL - Jul 8, 12:35 UTCJul 8, 15:10 UTC2h 35m
2026-07-08 OKPUL - Jul 8, 08:30 UTCJul 8, 11:20 UTC2h 50m
2026-07-03 OKPUL - Jul 3, 12:10 UTCJul 3, 12:40 UTC30m
2026-07-03 OKPUL - Jul 3, 10:55 UTCJul 3, 11:30 UTC35m
2026-07-03 OKPUL - Jul 3, 08:50 UTCJul 3, 09:25 UTC35m
2026-06-30 OKPUL - Jun 30, 15:35 UTCJun 30, 16:10 UTC35m
2026-06-30 OKPUL - Jun 30, 13:30 UTCJun 30, 14:00 UTC30m
2026-06-30 OKPUL - Jun 30, 12:30 UTCJun 30, 12:55 UTC25m
2026-06-29 OKPUL - Jun 29, 14:44 UTCJun 29, 15:24 UTC40m
2026-06-29 OKPUL - Jun 29, 13:14 UTCJun 29, 13:49 UTC35m
2026-06-28 OKPUL - Jun 28, 06:40 UTCJun 28, 07:40 UTC1h 0m
2026-06-26 OKPUL - Jun 26, 14:50 UTCJun 26, 16:14 UTC1h 25m
2026-06-26 OKPUL - Jun 26, 12:55 UTCJun 26, 14:09 UTC1h 15m
2026-06-18 OKPUL - Jun 18, 16:00 UTCJun 18, 16:35 UTC35m
2026-06-18 OKPUL - Jun 18, 13:25 UTCJun 18, 15:00 UTC1h 35m
2026-06-16 OKPUL - Jun 16, 09:15 UTCJun 16, 10:30 UTC1h 15m
2026-06-15 OKPUL - Jun 15, 08:15 UTCJun 15, 09:40 UTC1h 25m
2026-05-28 OKPUL - May 28, 13:50 UTCMay 28, 14:15 UTC25m
2026-05-28 OKPUL - May 28, 11:25 UTCMay 28, 11:50 UTC25m
2026-05-28 OKPUL - May 28, 08:25 UTCMay 28, 10:00 UTC1h 35m
2026-05-28 OKPUL - May 28, 04:45 UTCMay 28, 07:25 UTC2h 40m
2026-05-21 OKPUL - May 21, 14:55 UTCMay 21, 15:25 UTC30m
2026-05-21 OKPUL - May 21, 12:40 UTCMay 21, 13:15 UTC35m
2026-05-21 OKPUL - May 21, 11:35 UTCMay 21, 12:05 UTC30m
2026-05-21 OKPUL - May 21, 09:20 UTCMay 21, 09:50 UTC30m
2026-05-20 OKPUL - May 20, 07:55 UTCMay 20, 09:10 UTC1h 15m
2026-05-19 OKPUL - May 19, 13:20 UTCMay 19, 14:20 UTC1h 0m
2026-05-19 OKPUL - May 19, 09:00 UTCMay 19, 10:30 UTC1h 30m
2026-05-07 OKPUL - May 7, 09:00 UTCMay 7, 09:50 UTC50m
2026-05-07 OKPUL - May 7, 08:15 UTCMay 7, 08:45 UTC30m
2026-05-07 OKPUL - May 7, 06:05 UTCMay 7, 07:35 UTC1h 30m
2026-04-23 OKPUL - Apr 23, 09:10 UTCApr 23, 10:15 UTC1h 5m
2026-04-21 OKPUL - Apr 21, 15:40 UTCApr 21, 16:10 UTC30m
2026-04-21 OKPUL - Apr 21, 14:01 UTCApr 21, 14:50 UTC50m
2026-04-21 OKPUL - Apr 21, 11:40 UTCApr 21, 12:20 UTC40m
2026-04-21 OKPUL - Apr 21, 10:20 UTCApr 21, 11:00 UTC40m
2026-04-14 OKPUL - Apr 14, 14:50 UTCApr 14, 15:00 UTC10m
2026-04-14 OKPUL - Apr 14, 14:35 UTCApr 14, 14:45 UTC10m
2026-04-14 OKPUL - Apr 14, 13:20 UTCApr 14, 14:00 UTC40m
2026-04-14 OKPUL - Apr 14, 10:50 UTCApr 14, 11:00 UTC10m
2026-04-14 OKPUL - Apr 14, 10:30 UTCApr 14, 11:00 UTC30m
2026-04-14 OKPUL - Apr 14, 09:10 UTCApr 14, 09:45 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.

Prefer a tail-number view? See the OK-PUL page for operator, model, and routing details .

Mode-S 49D4F1 frequently asked

What is Mode-S code 49D4F1?
49D4F1 is an ICAO 24-bit transponder address. Allocated to Czech Republic. Assigned to OK-PUL.
Where is Mode-S 49D4F1 registered?
Mode-S code 49D4F1 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 49D4F1 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 49D4F1, octal 22352361, decimal 4,838,641.
What flights does 49D4F1 operate?
Mode-S 49D4F1 has broadcast 1 distinct callsign, including OKPUL.