Apparatus

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sensors Mode-S transponder

49D51E

ICAO 24-bit transponder address · allocated to Czech Republic

Currently assigned to OK-HHA · GUIMBAL G-2 Cabri

Hex
49D51E
Octal
22352436
Decimal
4,838,686
Country
CZ
Tail
OK-HHA
Type
G2CA
No current signal · last broadcast 1d ago
Flights observed
73
Distinct callsigns
1
Country
CZ
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 49D51E.

Country allocation

The ICAO 24-bit address 49D51E 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
OKHHA - 73 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 OKHHA - Jul 17, 08:45 UTCJul 17, 09:35 UTC50m
2026-07-17 OKHHA - Jul 17, 07:50 UTCJul 17, 08:35 UTC45m
2026-07-16 OKHHA - Jul 16, 12:34 UTCJul 16, 12:44 UTC10m
2026-07-16 OKHHA - Jul 16, 10:59 UTCJul 16, 11:05 UTC5m
2026-07-15 OKHHA - Jul 15, 05:55 UTCJul 15, 06:00 UTC5m
2026-07-09 OKHHA - Jul 9, 08:55 UTCJul 9, 09:00 UTC5m
2026-07-05 OKHHA - Jul 5, 15:10 UTCJul 5, 15:55 UTC45m
2026-07-03 OKHHA - Jul 3, 10:00 UTCJul 3, 12:20 UTC2h 20m
2026-07-03 OKHHA - Jul 3, 09:30 UTCJul 3, 09:50 UTC20m
2026-07-02 OKHHA - Jul 2, 16:30 UTCJul 2, 17:20 UTC50m
2026-07-02 OKHHA - Jul 2, 13:10 UTCJul 2, 14:55 UTC1h 45m
2026-07-02 OKHHA - Jul 2, 11:05 UTCJul 2, 11:15 UTC10m
2026-07-02 OKHHA - Jul 2, 09:05 UTCJul 2, 10:30 UTC1h 25m
2026-06-30 OKHHA - Jun 30, 16:55 UTCJun 30, 17:15 UTC20m
2026-06-30 OKHHA - Jun 30, 14:40 UTCJun 30, 15:35 UTC55m
2026-06-30 OKHHA - Jun 30, 12:05 UTCJun 30, 13:05 UTC1h 0m
2026-06-30 OKHHA - Jun 30, 10:15 UTCJun 30, 11:10 UTC55m
2026-06-30 OKHHA - Jun 30, 09:25 UTCJun 30, 09:35 UTC10m
2026-06-29 OKHHA - Jun 29, 15:04 UTCJun 29, 16:10 UTC1h 5m
2026-06-29 OKHHA - Jun 29, 11:55 UTCJun 29, 12:49 UTC55m
2026-06-29 OKHHA - Jun 29, 09:40 UTCJun 29, 10:44 UTC1h 5m
2026-06-25 OKHHA - Jun 25, 07:30 UTCJun 25, 07:39 UTC10m
2026-06-24 OKHHA - Jun 24, 17:10 UTCJun 24, 17:34 UTC25m
2026-06-24 OKHHA - Jun 24, 15:35 UTCJun 24, 16:24 UTC50m
2026-06-24 OKHHA - Jun 24, 13:14 UTCJun 24, 14:04 UTC50m
2026-06-24 OKHHA - Jun 24, 11:45 UTCJun 24, 11:59 UTC15m
2026-06-23 OKHHA - Jun 23, 16:39 UTCJun 23, 16:59 UTC20m
2026-06-23 OKHHA - Jun 23, 14:35 UTCJun 23, 15:34 UTC1h 0m
2026-06-23 OKHHA - Jun 23, 10:19 UTCJun 23, 12:15 UTC1h 55m
2026-06-23 OKHHA - Jun 23, 09:05 UTCJun 23, 09:24 UTC20m
2026-06-21 OKHHA - Jun 21, 16:39 UTCJun 21, 16:49 UTC10m
2026-06-20 OKHHA - Jun 20, 14:35 UTCJun 20, 16:14 UTC1h 40m
2026-06-20 OKHHA - Jun 20, 10:25 UTCJun 20, 12:14 UTC1h 50m
2026-06-20 OKHHA - Jun 20, 07:39 UTCJun 20, 09:09 UTC1h 30m
2026-06-20 OKHHA - Jun 20, 07:04 UTCJun 20, 07:09 UTC5m
2026-06-19 OKHHA - Jun 19, 11:04 UTCJun 19, 13:34 UTC2h 30m
2026-06-18 OKHHA - Jun 18, 18:30 UTCJun 18, 18:35 UTC5m
2026-06-18 OKHHA - Jun 18, 16:30 UTCJun 18, 17:50 UTC1h 20m
2026-06-18 OKHHA - Jun 18, 13:25 UTCJun 18, 14:20 UTC55m
2026-06-18 OKHHA - Jun 18, 10:00 UTCJun 18, 11:05 UTC1h 5m
2026-06-17 OKHHA - Jun 17, 16:00 UTCJun 17, 17:20 UTC1h 20m
2026-06-17 OKHHA - Jun 17, 12:50 UTCJun 17, 13:30 UTC40m
2026-06-16 OKHHA - Jun 16, 12:30 UTCJun 16, 15:30 UTC3h 0m
2026-06-05 OKHHA - Jun 5, 12:30 UTCJun 5, 12:50 UTC20m
2026-06-05 OKHHA - Jun 5, 11:20 UTCJun 5, 11:25 UTC5m
2026-06-04 OKHHA - Jun 4, 06:10 UTCJun 4, 06:15 UTC5m
2026-05-03 OKHHA - May 3, 10:40 UTCMay 3, 10:55 UTC15m
2026-05-02 OKHHA - May 2, 15:15 UTCMay 2, 15:25 UTC10m
2026-05-01 OKHHA - May 1, 12:05 UTCMay 1, 14:10 UTC2h 5m
2026-05-01 OKHHA - May 1, 09:55 UTCMay 1, 11:00 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.

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

Mode-S 49D51E frequently asked

What is Mode-S code 49D51E?
49D51E is an ICAO 24-bit transponder address. Allocated to Czech Republic. Assigned to OK-HHA.
Where is Mode-S 49D51E registered?
Mode-S code 49D51E 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 49D51E 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 49D51E, octal 22352436, decimal 4,838,686.
What flights does 49D51E operate?
Mode-S 49D51E has broadcast 1 distinct callsign, including OKHHA.