sensors Mode-S transponder

505C54

ICAO 24-bit transponder address · allocated to Slovakia

Currently assigned to OM-ESB · AEROSPOOL WT-9 Dynamic

Hex
505C54
Octal
24056124
Decimal
5,266,516
Country
SK
Tail
OM-ESB
Type
WT9
No current signal · last broadcast 18h ago
Flights observed
58
Distinct callsigns
1
Country
SK
Last broadcast
18h ago

Last known position

Most recent position reported by Mode-S 505C54.

Country allocation

The ICAO 24-bit address 505C54 falls within the block assigned to Slovakia (SK) by ICAO Annex 10, Volume III. Every aircraft registered in Slovakia 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
OMESB - 58 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 OMESB - Jun 2, 15:40 UTCJun 2, 17:25 UTC1h 45m
2026-05-31 OMESB - May 31, 10:15 UTCMay 31, 10:50 UTC35m
2026-05-31 OMESB - May 31, 08:55 UTCMay 31, 09:30 UTC35m
2026-05-30 OMESB - May 30, 15:45 UTCMay 30, 16:15 UTC30m
2026-05-30 OMESB - May 30, 12:25 UTCMay 30, 13:35 UTC1h 10m
2026-05-29 OMESB - May 29, 14:30 UTCMay 29, 17:20 UTC2h 50m
2026-05-29 OMESB - May 29, 11:55 UTCMay 29, 13:05 UTC1h 10m
2026-05-24 OMESB - May 24, 14:45 UTCMay 24, 15:55 UTC1h 10m
2026-05-24 OMESB - May 24, 11:35 UTCMay 24, 13:55 UTC2h 20m
2026-05-24 OMESB - May 24, 07:00 UTCMay 24, 09:05 UTC2h 5m
2026-05-24 OMESB - May 24, 05:25 UTCMay 24, 06:30 UTC1h 5m
2026-05-23 OMESB - May 23, 16:10 UTCMay 23, 16:25 UTC15m
2026-05-23 OMESB - May 23, 15:20 UTCMay 23, 15:35 UTC15m
2026-05-23 OMESB - May 23, 12:35 UTCMay 23, 12:45 UTC10m
2026-05-23 OMESB - May 23, 08:10 UTCMay 23, 09:15 UTC1h 5m
2026-05-22 OMESB - May 22, 17:05 UTCMay 22, 17:45 UTC40m
2026-05-22 OMESB - May 22, 15:25 UTCMay 22, 15:45 UTC20m
2026-05-22 OMESB - May 22, 12:05 UTCMay 22, 12:45 UTC40m
2026-05-22 OMESB - May 22, 10:15 UTCMay 22, 11:35 UTC1h 20m
2026-05-22 OMESB - May 22, 07:30 UTCMay 22, 07:45 UTC15m
2026-05-20 OMESB - May 20, 06:10 UTCMay 20, 06:30 UTC20m
2026-05-19 OMESB - May 19, 16:30 UTCMay 19, 17:40 UTC1h 10m
2026-05-19 OMESB - May 19, 13:45 UTCMay 19, 14:15 UTC30m
2026-05-19 OMESB - May 19, 11:40 UTCMay 19, 12:35 UTC55m
2026-05-19 OMESB - May 19, 09:50 UTCMay 19, 10:45 UTC55m
2026-05-10 OMESB - May 10, 10:30 UTCMay 10, 12:00 UTC1h 30m
2026-05-10 OMESB - May 10, 06:55 UTCMay 10, 10:00 UTC3h 5m
2026-05-09 OMESB - May 9, 13:25 UTCMay 9, 14:00 UTC35m
2026-05-09 OMESB - May 9, 10:05 UTCMay 9, 10:55 UTC50m
2026-05-09 OMESB - May 9, 07:55 UTCMay 9, 09:50 UTC1h 55m
2026-05-08 OMESB - May 8, 13:55 UTCMay 8, 14:35 UTC40m
2026-05-08 OMESB - May 8, 12:14 UTCMay 8, 12:55 UTC40m
2026-05-08 OMESB - May 8, 10:54 UTCMay 8, 11:09 UTC15m
2026-05-08 OMESB - May 8, 06:59 UTCMay 8, 09:54 UTC2h 55m
2026-05-02 OMESB - May 2, 16:25 UTCMay 2, 17:25 UTC1h 0m
2026-05-02 OMESB - May 2, 15:05 UTCMay 2, 15:40 UTC35m
2026-05-02 OMESB - May 2, 14:20 UTCMay 2, 14:35 UTC15m
2026-05-02 OMESB - May 2, 11:25 UTCMay 2, 13:20 UTC1h 55m
2026-05-02 OMESB - May 2, 10:05 UTCMay 2, 10:50 UTC45m
2026-05-02 OMESB - May 2, 08:10 UTCMay 2, 09:15 UTC1h 5m
2026-05-02 OMESB - May 2, 06:50 UTCMay 2, 07:25 UTC35m
2026-04-29 OMESB - Apr 29, 13:15 UTCApr 29, 13:25 UTC10m
2026-04-29 OMESB - Apr 29, 11:25 UTCApr 29, 12:05 UTC40m
2026-04-29 OMESB - Apr 29, 06:45 UTCApr 29, 07:10 UTC25m
2026-04-28 OMESB - Apr 28, 14:20 UTCApr 28, 14:45 UTC25m
2026-04-28 OMESB - Apr 28, 12:25 UTCApr 28, 12:45 UTC20m
2026-04-28 OMESB - Apr 28, 10:50 UTCApr 28, 11:50 UTC1h 0m
2026-04-28 OMESB - Apr 28, 08:20 UTCApr 28, 09:35 UTC1h 15m
2026-04-27 OMESB - Apr 27, 15:50 UTCApr 27, 16:50 UTC1h 0m
2026-04-25 OMESB - Apr 25, 14:25 UTCApr 25, 15:10 UTC45m

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 OM-ESB page for operator, model, and routing details .

Mode-S 505C54 frequently asked

What is Mode-S code 505C54?
505C54 is an ICAO 24-bit transponder address. Allocated to Slovakia. Assigned to OM-ESB.
Where is Mode-S 505C54 registered?
Mode-S code 505C54 is allocated to Slovakia (SK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 505C54 broadcasting right now?
No active broadcast right now. Last signal was 18h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 505C54, octal 24056124, decimal 5,266,516.
What flights does 505C54 operate?
Mode-S 505C54 has broadcast 1 distinct callsign, including OMESB.