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sensors Mode-S transponder

505E66

ICAO 24-bit transponder address · allocated to Slovakia

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

Hex
505E66
Octal
24057146
Decimal
5,267,046
Country
SK
Tail
OM-ESA
Type
WT9
No current signal · last broadcast Jun 17, 11:00 UTC
Flights observed
134
Distinct callsigns
1
Country
SK
Last broadcast
Jun 17, 11:00 UTC

Last known position

Most recent position reported by Mode-S 505E66.

Country allocation

The ICAO 24-bit address 505E66 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
OMESA - 134 2026-06-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-17 OMESA - Jun 17, 07:55 UTCJun 17, 11:00 UTC3h 5m
2026-06-16 OMESA - Jun 16, 17:35 UTCJun 16, 18:50 UTC1h 15m
2026-06-16 OMESA - Jun 16, 15:40 UTCJun 16, 15:50 UTC10m
2026-06-16 OMESA - Jun 16, 13:25 UTCJun 16, 14:20 UTC55m
2026-06-16 OMESA - Jun 16, 11:45 UTCJun 16, 12:14 UTC30m
2026-06-16 OMESA - Jun 16, 11:00 UTCJun 16, 11:10 UTC10m
2026-06-16 OMESA - Jun 16, 08:44 UTCJun 16, 09:45 UTC1h 0m
2026-06-16 OMESA - Jun 16, 06:50 UTCJun 16, 07:45 UTC55m
2026-06-14 OMESA - Jun 14, 10:50 UTCJun 14, 11:20 UTC30m
2026-06-14 OMESA - Jun 14, 07:25 UTCJun 14, 08:25 UTC1h 0m
2026-06-13 OMESA - Jun 13, 16:55 UTCJun 13, 18:40 UTC1h 45m
2026-06-13 OMESA - Jun 13, 15:55 UTCJun 13, 16:15 UTC20m
2026-06-13 OMESA - Jun 13, 13:10 UTCJun 13, 14:40 UTC1h 30m
2026-06-13 OMESA - Jun 13, 09:25 UTCJun 13, 10:10 UTC45m
2026-06-12 OMESA - Jun 12, 17:20 UTCJun 12, 17:45 UTC25m
2026-06-12 OMESA - Jun 12, 15:30 UTCJun 12, 16:25 UTC55m
2026-06-12 OMESA - Jun 12, 11:35 UTCJun 12, 14:15 UTC2h 40m
2026-06-08 OMESA - Jun 8, 13:15 UTCJun 8, 15:00 UTC1h 45m
2026-06-08 OMESA - Jun 8, 08:15 UTCJun 8, 10:00 UTC1h 45m
2026-06-07 OMESA - Jun 7, 13:55 UTCJun 7, 14:50 UTC55m
2026-06-07 OMESA - Jun 7, 11:35 UTCJun 7, 12:30 UTC55m
2026-06-07 OMESA - Jun 7, 09:55 UTCJun 7, 10:15 UTC20m
2026-06-07 OMESA - Jun 7, 07:50 UTCJun 7, 08:50 UTC1h 0m
2026-06-07 OMESA - Jun 7, 06:00 UTCJun 7, 07:20 UTC1h 20m
2026-06-06 OMESA - Jun 6, 15:54 UTCJun 6, 18:39 UTC2h 45m
2026-06-06 OMESA - Jun 6, 14:09 UTCJun 6, 14:40 UTC30m
2026-06-06 OMESA - Jun 6, 12:30 UTCJun 6, 13:00 UTC30m
2026-06-06 OMESA - Jun 6, 10:04 UTCJun 6, 11:35 UTC1h 30m
2026-06-06 OMESA - Jun 6, 09:04 UTCJun 6, 09:34 UTC30m
2026-06-06 OMESA - Jun 6, 08:05 UTCJun 6, 08:30 UTC25m
2026-06-06 OMESA - Jun 6, 05:25 UTCJun 6, 06:00 UTC35m
2026-06-05 OMESA - Jun 5, 17:30 UTCJun 5, 18:25 UTC55m
2026-06-05 OMESA - Jun 5, 16:25 UTCJun 5, 16:50 UTC25m
2026-06-04 OMESA - Jun 4, 17:00 UTCJun 4, 18:00 UTC1h 0m
2026-06-04 OMESA - Jun 4, 15:40 UTCJun 4, 16:00 UTC20m
2026-06-04 OMESA - Jun 4, 14:05 UTCJun 4, 14:55 UTC50m
2026-06-04 OMESA - Jun 4, 11:50 UTCJun 4, 12:45 UTC55m
2026-06-04 OMESA - Jun 4, 09:25 UTCJun 4, 10:25 UTC1h 0m
2026-06-02 OMESA - Jun 2, 15:30 UTCJun 2, 17:55 UTC2h 25m
2026-06-02 OMESA - Jun 2, 13:40 UTCJun 2, 14:55 UTC1h 15m
2026-06-02 OMESA - Jun 2, 09:10 UTCJun 2, 10:25 UTC1h 15m
2026-06-02 OMESA - Jun 2, 07:35 UTCJun 2, 08:15 UTC40m
2026-05-31 OMESA - May 31, 14:45 UTCMay 31, 15:40 UTC55m
2026-05-31 OMESA - May 31, 12:25 UTCMay 31, 13:55 UTC1h 30m
2026-05-31 OMESA - May 31, 08:25 UTCMay 31, 09:40 UTC1h 15m
2026-05-30 OMESA - May 30, 11:15 UTCMay 30, 12:55 UTC1h 40m
2026-05-30 OMESA - May 30, 09:50 UTCMay 30, 10:15 UTC25m
2026-05-30 OMESA - May 30, 08:45 UTCMay 30, 09:20 UTC35m
2026-05-30 OMESA - May 30, 06:00 UTCMay 30, 06:45 UTC45m
2026-05-29 OMESA - May 29, 17:10 UTCMay 29, 17:35 UTC25m

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

Mode-S 505E66 frequently asked

What is Mode-S code 505E66?
505E66 is an ICAO 24-bit transponder address. Allocated to Slovakia. Assigned to OM-ESA.
Where is Mode-S 505E66 registered?
Mode-S code 505E66 is allocated to Slovakia (SK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 505E66 broadcasting right now?
No active broadcast right now. Last signal was Jun 17, 11:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 505E66, octal 24057146, decimal 5,267,046.
What flights does 505E66 operate?
Mode-S 505E66 has broadcast 1 distinct callsign, including OMESA.