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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 Jul 26, 16:00 UTC
Flights observed
183
Distinct callsigns
1
Country
SK
Last broadcast
Jul 26, 16:00 UTC

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 - 183 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 OMESB - Jul 26, 15:45 UTCJul 26, 16:00 UTC15m
2026-07-26 OMESB - Jul 26, 05:35 UTCJul 26, 06:40 UTC1h 6m
2026-07-25 OMESB - Jul 25, 17:10 UTCJul 25, 17:25 UTC15m
2026-07-25 OMESB - Jul 25, 09:20 UTCJul 25, 16:40 UTC7h 20m
2026-07-25 OMESB - Jul 25, 06:55 UTCJul 25, 08:45 UTC1h 50m
2026-07-24 OMESB - Jul 24, 12:20 UTCJul 24, 13:00 UTC40m
2026-07-24 OMESB - Jul 24, 09:15 UTCJul 24, 09:55 UTC40m
2026-07-23 OMESB - Jul 23, 13:35 UTCJul 23, 14:40 UTC1h 5m
2026-07-22 OMESB - Jul 22, 16:00 UTCJul 22, 17:05 UTC1h 5m
2026-07-22 OMESB - Jul 22, 12:55 UTCJul 22, 14:00 UTC1h 5m
2026-07-22 OMESB - Jul 22, 11:10 UTCJul 22, 11:30 UTC20m
2026-07-21 OMESB - Jul 21, 15:20 UTCJul 21, 16:15 UTC55m
2026-07-21 OMESB - Jul 21, 13:30 UTCJul 21, 13:45 UTC15m
2026-07-21 OMESB - Jul 21, 09:00 UTCJul 21, 10:10 UTC1h 10m
2026-07-21 OMESB - Jul 21, 06:50 UTCJul 21, 07:40 UTC50m
2026-07-20 OMESB - Jul 20, 15:40 UTCJul 20, 17:00 UTC1h 20m
2026-07-19 OMESB - Jul 19, 09:15 UTCJul 19, 10:20 UTC1h 5m
2026-07-19 OMESB - Jul 19, 06:30 UTCJul 19, 08:05 UTC1h 35m
2026-07-18 OMESB - Jul 18, 12:05 UTCJul 18, 17:20 UTC5h 15m
2026-07-18 OMESB - Jul 18, 10:05 UTCJul 18, 10:15 UTC10m
2026-07-18 OMESB - Jul 18, 08:30 UTCJul 18, 09:05 UTC35m
2026-07-18 OMESB - Jul 18, 06:30 UTCJul 18, 07:40 UTC1h 10m
2026-07-17 OMESB - Jul 17, 08:15 UTCJul 17, 09:04 UTC50m
2026-07-17 OMESB - Jul 17, 05:04 UTCJul 17, 06:25 UTC1h 20m
2026-07-16 OMESB - Jul 16, 17:20 UTCJul 16, 18:50 UTC1h 30m
2026-07-16 OMESB - Jul 16, 13:34 UTCJul 16, 16:35 UTC3h 0m
2026-07-16 OMESB - Jul 16, 12:30 UTCJul 16, 12:55 UTC25m
2026-07-16 OMESB - Jul 16, 11:20 UTCJul 16, 12:00 UTC40m
2026-07-15 OMESB - Jul 15, 04:20 UTCJul 15, 06:05 UTC1h 45m
2026-07-14 OMESB - Jul 14, 16:40 UTCJul 14, 17:50 UTC1h 10m
2026-07-14 OMESB - Jul 14, 15:10 UTCJul 14, 16:00 UTC50m
2026-07-14 OMESB - Jul 14, 13:00 UTCJul 14, 14:10 UTC1h 10m
2026-07-14 OMESB - Jul 14, 11:20 UTCJul 14, 12:10 UTC50m
2026-07-14 OMESB - Jul 14, 05:35 UTCJul 14, 08:35 UTC3h 0m
2026-07-13 OMESB - Jul 13, 10:25 UTCJul 13, 11:25 UTC1h 0m
2026-07-12 OMESB - Jul 12, 07:45 UTCJul 12, 08:35 UTC50m
2026-07-12 OMESB - Jul 12, 06:05 UTCJul 12, 06:50 UTC45m
2026-07-11 OMESB - Jul 11, 17:05 UTCJul 11, 18:35 UTC1h 30m
2026-07-11 OMESB - Jul 11, 13:05 UTCJul 11, 15:55 UTC2h 50m
2026-07-11 OMESB - Jul 11, 08:20 UTCJul 11, 12:35 UTC4h 15m
2026-07-11 OMESB - Jul 11, 05:40 UTCJul 11, 07:00 UTC1h 20m
2026-07-10 OMESB - Jul 10, 16:40 UTCJul 10, 19:05 UTC2h 25m
2026-07-10 OMESB - Jul 10, 15:00 UTCJul 10, 16:10 UTC1h 10m
2026-07-10 OMESB - Jul 10, 12:55 UTCJul 10, 14:15 UTC1h 20m
2026-07-10 OMESB - Jul 10, 08:45 UTCJul 10, 11:20 UTC2h 35m
2026-07-10 OMESB - Jul 10, 06:40 UTCJul 10, 07:45 UTC1h 5m
2026-07-09 OMESB - Jul 9, 14:00 UTCJul 9, 14:50 UTC50m
2026-07-08 OMESB - Jul 8, 18:40 UTCJul 8, 19:20 UTC40m
2026-07-08 OMESB - Jul 8, 16:55 UTCJul 8, 17:55 UTC1h 0m
2026-07-08 OMESB - Jul 8, 13:50 UTCJul 8, 16:25 UTC2h 35m

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 Jul 26, 16:00 UTC.
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.