Apparatus

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sensors Mode-S transponder

498B26

ICAO 24-bit transponder address · allocated to Czech Republic

Currently assigned to OK-BYF · AIRBUS HELICOPTERS EC-135/635

Hex
498B26
Octal
22305446
Decimal
4,819,750
Country
CZ
Tail
OK-BYF
Type
EC35
No current signal · last broadcast 19d ago
Flights observed
77
Distinct callsigns
1
Country
CZ
Last broadcast
19d ago

Last known position

Most recent position reported by Mode-S 498B26.

Country allocation

The ICAO 24-bit address 498B26 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
OKBYF - 77 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-04 OKBYF PRG → PRG Jul 4, 07:30 UTCJul 4, 10:25 UTC2h 55m
2026-06-25 OKBYF - Jun 25, 11:19 UTCJun 25, 12:40 UTC1h 20m
2026-06-24 OKBYF - Jun 24, 12:50 UTCJun 24, 13:30 UTC40m
2026-06-23 OKBYF - Jun 23, 10:24 UTCJun 23, 10:44 UTC20m
2026-06-23 OKBYF - Jun 23, 08:39 UTCJun 23, 09:05 UTC25m
2026-06-21 OKBYF - Jun 21, 13:24 UTCJun 21, 14:59 UTC1h 35m
2026-06-21 OKBYF - Jun 21, 11:10 UTCJun 21, 11:24 UTC15m
2026-06-21 OKBYF - Jun 21, 09:44 UTCJun 21, 09:55 UTC10m
2026-06-21 OKBYF - Jun 21, 07:20 UTCJun 21, 07:49 UTC30m
2026-06-21 OKBYF - Jun 21, 05:59 UTCJun 21, 06:10 UTC10m
2026-06-20 OKBYF - Jun 20, 07:24 UTCJun 20, 08:55 UTC1h 30m
2026-06-19 OKBYF BRQ → BRQ Jun 19, 02:29 UTCJun 19, 03:05 UTC35m
2026-06-18 OKBYF BRQ → BRQ Jun 18, 20:25 UTCJun 18, 22:35 UTC2h 10m
2026-06-18 OKBYF - Jun 18, 09:55 UTCJun 18, 10:10 UTC15m
2026-06-18 OKBYF - Jun 18, 07:45 UTCJun 18, 08:10 UTC25m
2026-06-17 OKBYF - Jun 17, 13:45 UTCJun 17, 14:40 UTC55m
2026-06-16 OKBYF - Jun 16, 08:10 UTCJun 16, 09:20 UTC1h 10m
2026-06-16 OKBYF BRQ → PRG Jun 16, 05:05 UTCJun 16, 06:30 UTC1h 25m
2026-06-14 OKBYF BRQ → BRQ Jun 14, 23:59 UTCJun 15, 01:50 UTC1h 50m
2026-06-14 OKBYF BRQ → BRQ Jun 14, 13:00 UTCJun 14, 13:50 UTC50m
2026-06-13 OKBYF - Jun 13, 13:05 UTCJun 13, 15:05 UTC2h 0m
2026-06-13 OKBYF BRQ → BRQ Jun 13, 06:00 UTCJun 13, 08:15 UTC2h 15m
2026-06-12 OKBYF BRQ → BRQ Jun 12, 11:00 UTCJun 12, 13:15 UTC2h 15m
2026-06-10 OKBYF - Jun 10, 15:25 UTCJun 10, 15:50 UTC25m
2026-06-09 OKBYF BRQ → BRQ Jun 9, 20:20 UTCJun 9, 20:30 UTC10m
2026-06-09 OKBYF BRQ → BRQ Jun 9, 17:15 UTCJun 9, 19:00 UTC1h 45m
2026-06-09 OKBYF - Jun 9, 12:10 UTCJun 9, 13:15 UTC1h 5m
2026-06-09 OKBYF BRQ → PRG Jun 9, 08:25 UTCJun 9, 09:45 UTC1h 20m
2026-06-08 OKBYF - Jun 8, 10:40 UTCJun 8, 11:40 UTC1h 0m
2026-06-08 OKBYF - Jun 8, 06:15 UTCJun 8, 07:55 UTC1h 40m
2026-06-07 OKBYF - Jun 7, 17:50 UTCJun 7, 19:20 UTC1h 30m
2026-06-06 OKBYF BRQ → BRQ Jun 6, 15:39 UTCJun 6, 17:19 UTC1h 40m
2026-06-06 OKBYF - Jun 6, 12:30 UTCJun 6, 12:49 UTC20m
2026-06-06 OKBYF - Jun 6, 10:34 UTCJun 6, 10:55 UTC20m
2026-06-05 OKBYF - Jun 5, 17:05 UTCJun 5, 18:50 UTC1h 45m
2026-06-05 OKBYF - Jun 5, 09:50 UTCJun 5, 10:15 UTC25m
2026-06-05 OKBYF - Jun 5, 06:00 UTCJun 5, 06:20 UTC20m
2026-06-03 OKBYF - Jun 3, 16:40 UTCJun 3, 18:00 UTC1h 20m
2026-06-03 OKBYF - Jun 3, 00:10 UTCJun 3, 01:05 UTC55m
2026-06-01 OKBYF - Jun 1, 14:55 UTCJun 1, 16:20 UTC1h 25m
2026-05-30 OKBYF BRQ → BRQ May 30, 18:55 UTCMay 30, 19:40 UTC45m
2026-05-26 OKBYF JCL → BRQ May 26, 13:24 UTCMay 26, 14:14 UTC50m
2026-05-25 OKBYF - May 25, 03:25 UTCMay 25, 03:40 UTC15m
2026-05-21 OKBYF - May 21, 22:05 UTCMay 21, 22:25 UTC20m
2026-05-21 OKBYF - May 21, 13:55 UTCMay 21, 14:10 UTC15m
2026-05-21 OKBYF - May 21, 12:55 UTCMay 21, 13:15 UTC20m
2026-05-21 OKBYF - May 21, 10:45 UTCMay 21, 11:00 UTC15m
2026-05-20 OKBYF - May 20, 02:10 UTCMay 20, 03:20 UTC1h 10m
2026-05-19 OKBYF - May 19, 23:10 UTCMay 20, 00:40 UTC1h 30m
2026-05-19 OKBYF - May 19, 22:55 UTCMay 19, 23:05 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.

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

Mode-S 498B26 frequently asked

What is Mode-S code 498B26?
498B26 is an ICAO 24-bit transponder address. Allocated to Czech Republic. Assigned to OK-BYF.
Where is Mode-S 498B26 registered?
Mode-S code 498B26 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 498B26 broadcasting right now?
No active broadcast right now. Last signal was 19d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 498B26, octal 22305446, decimal 4,819,750.
What flights does 498B26 operate?
Mode-S 498B26 has broadcast 1 distinct callsign, including OKBYF.