Apparatus

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sensors Mode-S transponder

498B33

ICAO 24-bit transponder address · allocated to Czech Republic

Currently assigned to OK-BYS · BELL 412

Hex
498B33
Octal
22305463
Decimal
4,819,763
Country
CZ
Tail
OK-BYS
Type
B412
No current signal · last broadcast 2d ago
Flights observed
130
Distinct callsigns
1
Country
CZ
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 498B33.

Country allocation

The ICAO 24-bit address 498B33 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
OKBYS - 129 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 OKBYS - Jul 11, 12:10 UTCJul 11, 12:20 UTC10m
2026-07-11 OKBYS - Jul 11, 11:00 UTCJul 11, 11:35 UTC35m
2026-07-10 OKBYS - Jul 10, 15:45 UTCJul 10, 16:05 UTC20m
2026-07-10 OKBYS - Jul 10, 14:55 UTCJul 10, 15:05 UTC10m
2026-07-10 OKBYS - Jul 10, 13:00 UTCJul 10, 13:20 UTC20m
2026-07-10 OKBYS - Jul 10, 11:45 UTCJul 10, 12:05 UTC20m
2026-07-10 OKBYS - Jul 10, 09:30 UTCJul 10, 09:45 UTC15m
2026-07-10 OKBYS - Jul 10, 05:50 UTCJul 10, 06:05 UTC15m
2026-07-10 OKBYS - Jul 10, 03:50 UTCJul 10, 04:10 UTC20m
2026-07-09 OKBYS - Jul 9, 19:55 UTCJul 9, 20:20 UTC25m
2026-07-09 OKBYS - Jul 9, 17:25 UTCJul 9, 18:15 UTC50m
2026-07-09 OKBYS - Jul 9, 14:55 UTCJul 9, 15:50 UTC55m
2026-07-09 OKBYS - Jul 9, 13:10 UTCJul 9, 13:25 UTC15m
2026-07-09 OKBYS - Jul 9, 12:15 UTCJul 9, 12:30 UTC15m
2026-07-09 OKBYS - Jul 9, 09:55 UTCJul 9, 10:10 UTC15m
2026-07-09 OKBYS - Jul 9, 07:55 UTCJul 9, 08:10 UTC15m
2026-07-07 OKBYS - Jul 7, 08:45 UTCJul 7, 09:00 UTC15m
2026-07-07 OKBYS - Jul 7, 08:00 UTCJul 7, 08:10 UTC10m
2026-07-07 OKBYS - Jul 7, 06:55 UTCJul 7, 07:05 UTC10m
2026-07-03 OKBYS - Jul 3, 10:45 UTCJul 3, 11:05 UTC20m
2026-07-02 OKBYS - Jul 2, 08:20 UTCJul 2, 09:00 UTC40m
2026-07-01 OKBYS - Jul 1, 14:40 UTCJul 1, 16:00 UTC1h 20m
2026-07-01 OKBYS BRQ → BRQ Jul 1, 12:35 UTCJul 1, 12:50 UTC15m
2026-06-30 OKBYS - Jun 30, 11:05 UTCJun 30, 13:50 UTC2h 45m
2026-06-30 OKBYS - Jun 30, 08:55 UTCJun 30, 10:15 UTC1h 20m
2026-06-30 OKBYS - Jun 30, 07:25 UTCJun 30, 08:05 UTC40m
2026-06-29 OKBYS - Jun 29, 12:05 UTCJun 29, 13:39 UTC1h 35m
2026-06-29 OKBYS - Jun 29, 09:50 UTCJun 29, 11:14 UTC1h 25m
2026-06-29 OKBYS - Jun 29, 08:19 UTCJun 29, 08:29 UTC10m
2026-06-27 OKBYS BRQ → BRQ Jun 27, 06:19 UTCJun 27, 07:15 UTC55m
2026-06-26 OKBYS - Jun 26, 08:40 UTCJun 26, 10:05 UTC1h 25m
2026-06-26 OKBYS - Jun 26, 07:55 UTCJun 26, 08:05 UTC10m
2026-06-25 OKBYS - Jun 25, 09:34 UTCJun 25, 09:50 UTC15m
2026-06-24 OKBYS - Jun 24, 09:59 UTCJun 24, 10:19 UTC20m
2026-06-24 OKBYS - Jun 24, 06:45 UTCJun 24, 07:05 UTC20m
2026-06-22 OKBYS - Jun 22, 07:49 UTCJun 22, 09:04 UTC1h 15m
2026-06-22 OKBYS - Jun 22, 06:45 UTCJun 22, 06:54 UTC10m
2026-06-20 OKBYS - Jun 20, 12:24 UTCJun 20, 13:09 UTC45m
2026-06-20 OKBYS - Jun 20, 11:20 UTCJun 20, 11:34 UTC15m
2026-06-19 OKBYS - Jun 19, 10:14 UTCJun 19, 10:44 UTC30m
2026-06-19 OKBYS - Jun 19, 06:29 UTCJun 19, 06:49 UTC20m
2026-06-18 OKBYS - Jun 18, 06:50 UTCJun 18, 07:25 UTC35m
2026-06-17 OKBYS BRQ → BRQ Jun 17, 06:20 UTCJun 17, 06:50 UTC30m
2026-06-16 OKBYS - Jun 16, 10:30 UTCJun 16, 11:49 UTC1h 20m
2026-06-14 OKBYS BRQ → BRQ Jun 14, 13:55 UTCJun 14, 14:25 UTC30m
2026-06-14 OKBYS - Jun 14, 09:30 UTCJun 14, 09:55 UTC25m
2026-06-14 OKBYS - Jun 14, 07:40 UTCJun 14, 08:00 UTC20m
2026-06-13 OKBYS - Jun 13, 11:25 UTCJun 13, 11:35 UTC10m
2026-06-13 OKBYS - Jun 13, 09:55 UTCJun 13, 10:05 UTC10m
2026-06-11 OKBYS BRQ → BRQ Jun 11, 10:15 UTCJun 11, 11:05 UTC50m

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-BYS page for operator, model, and routing details .

Mode-S 498B33 frequently asked

What is Mode-S code 498B33?
498B33 is an ICAO 24-bit transponder address. Allocated to Czech Republic. Assigned to OK-BYS.
Where is Mode-S 498B33 registered?
Mode-S code 498B33 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 498B33 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 498B33, octal 22305463, decimal 4,819,763.
What flights does 498B33 operate?
Mode-S 498B33 has broadcast 1 distinct callsign, including OKBYS.