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sensors Mode-S transponder

4CA1C9

ICAO 24-bit transponder address · allocated to Ireland

Hex
4CA1C9
Octal
23120711
Decimal
5,022,153
Country
IE
No current signal · last broadcast 2h ago
Flights observed
266
Distinct callsigns
20
Country
IE
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 4CA1C9.

Country allocation

The ICAO 24-bit address 4CA1C9 falls within the block assigned to Ireland (IE) by ICAO Annex 10, Volume III. Every aircraft registered in Ireland 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 20 distinct

Callsign Airline Flights Last seen
SAS742 - 6 2026-07-02
SAS2536 Scandinavian Airlines System 5 2026-06-18
SAS2535 Scandinavian Airlines System 5 2026-06-18
SAS87R - 4 2026-07-02
SAS743 - 4 2026-07-03
SAS34J - 4 2026-07-02
SAS84P - 3 2026-06-17
SAS82T - 3 2026-07-08
SAS745 - 3 2026-06-18
SAS662 - 3 2026-06-17
SAS661 - 3 2026-06-17
SAS649 Scandinavian Airlines System 3 2026-06-01
SAS55L - 3 2026-06-30
SAS51R Scandinavian Airlines System 3 2026-06-01
SAS40L - 3 2026-07-08
SAS2886 Scandinavian Airlines System 3 2026-06-04
SAS2883 Scandinavian Airlines System 3 2026-06-04
SAS21M - 3 2026-06-30
SAS1790 - 3 2026-06-18
SAS1680 - 3 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-09 SAS007 - Jul 9, 13:30 UTCJul 9, 14:15 UTC45m
2026-07-09 SAS2050 - Jul 9, 11:15 UTCJul 9, 12:40 UTC1h 25m
2026-07-09 SAS2051 - Jul 9, 09:10 UTCJul 9, 10:30 UTC1h 20m
2026-07-09 SAS006 - Jul 9, 07:25 UTCJul 9, 08:20 UTC55m
2026-07-09 SAS025 - Jul 9, 04:25 UTCJul 9, 05:05 UTC40m
2026-07-08 SAS026 - Jul 8, 19:15 UTCJul 8, 19:50 UTC35m
2026-07-08 SAS1482 BGO → ARN Jul 8, 17:25 UTCJul 8, 18:25 UTC1h 0m
2026-07-08 SAS1481 - Jul 8, 15:30 UTCJul 8, 16:40 UTC1h 10m
2026-07-08 SAS82T TLL → ARN Jul 8, 13:50 UTCJul 8, 14:35 UTC45m
2026-07-08 SAS40L ARN → TLL Jul 8, 12:25 UTCJul 8, 13:00 UTC35m
2026-07-08 SAS84B - Jul 8, 10:45 UTCJul 8, 11:30 UTC45m
2026-07-08 SAS2026 - Jul 8, 08:50 UTCJul 8, 09:20 UTC30m
2026-07-08 SAS1015 - Jul 8, 06:40 UTCJul 8, 07:35 UTC55m
2026-07-08 SAS1014 - Jul 8, 05:10 UTCJul 8, 06:00 UTC50m
2026-07-07 SAS1484 OSL → ARN Jul 7, 20:10 UTCJul 7, 20:50 UTC40m
2026-07-07 SAS1483 ARN → OSL Jul 7, 18:15 UTCJul 7, 18:55 UTC40m
2026-07-07 SAS79E BER → ARN Jul 7, 15:50 UTCJul 7, 17:05 UTC1h 15m
2026-07-07 SAS95W ARN → BER Jul 7, 13:30 UTCJul 7, 14:45 UTC1h 15m
2026-07-07 SAS30P - Jul 7, 11:30 UTCJul 7, 12:25 UTC55m
2026-07-07 SAS69H - Jul 7, 09:45 UTCJul 7, 10:40 UTC55m
2026-07-07 SAS81C - Jul 7, 07:40 UTCJul 7, 08:35 UTC55m
2026-07-07 SAS69N - Jul 7, 06:00 UTCJul 7, 06:50 UTC50m
2026-07-07 SAS025 - Jul 7, 04:15 UTCJul 7, 05:00 UTC45m
2026-07-06 SAS026 - Jul 6, 19:15 UTCJul 6, 19:50 UTC35m
2026-07-06 SAS1482 BGO → ARN Jul 6, 17:25 UTCJul 6, 18:20 UTC55m
2026-07-06 SAS1481 ARN → BGO Jul 6, 15:30 UTCJul 6, 16:40 UTC1h 10m
2026-07-06 SAS82T TLL → ARN Jul 6, 13:35 UTCJul 6, 14:15 UTC40m
2026-07-06 SAS40L ARN → TLL Jul 6, 12:05 UTCJul 6, 12:50 UTC45m
2026-07-06 SAS1015 - Jul 6, 10:00 UTCJul 6, 10:50 UTC50m
2026-07-06 SAS1014 - Jul 6, 08:20 UTCJul 6, 09:05 UTC45m
2026-07-06 SAS705 HEL → ARN Jul 6, 06:45 UTCJul 6, 07:25 UTC40m
2026-07-06 SAS702 ARN → HEL Jul 6, 05:10 UTCJul 6, 05:55 UTC45m
2026-07-05 SAS1482 BGO → ARN Jul 5, 21:05 UTCJul 5, 22:05 UTC1h 0m
2026-07-05 SAS1481 ARN → BGO Jul 5, 19:15 UTCJul 5, 20:30 UTC1h 15m
2026-07-05 SAS1830 - Jul 5, 15:40 UTCJul 5, 18:25 UTC2h 45m
2026-07-05 SAS1829 ARN → NCE Jul 5, 11:55 UTCJul 5, 14:35 UTC2h 40m
2026-07-05 SAS2023 - Jul 5, 10:15 UTCJul 5, 10:55 UTC40m
2026-07-05 SAS024 - Jul 5, 08:10 UTCJul 5, 09:10 UTC1h 0m
2026-07-05 SAS9240 - Jul 5, 05:50 UTCJul 5, 06:45 UTC55m
2026-07-04 SAS698 PSA → CPH Jul 4, 18:30 UTCJul 4, 20:25 UTC1h 55m
2026-07-04 SAS697 - Jul 4, 15:05 UTCJul 4, 17:00 UTC1h 55m
2026-07-04 SAS1643 - Jul 4, 13:10 UTCJul 4, 14:15 UTC1h 5m
2026-07-04 SAS1642 - Jul 4, 11:25 UTCJul 4, 12:25 UTC1h 0m
2026-07-04 SAS89T ZRH → CPH Jul 4, 08:40 UTCJul 4, 10:20 UTC1h 40m
2026-07-04 SAS601 - Jul 4, 06:10 UTCJul 4, 07:35 UTC1h 25m
2026-07-04 SAS1758 - Jul 4, 04:35 UTCJul 4, 04:45 UTC10m
2026-07-03 SAS753 - Jul 3, 21:25 UTCJul 3, 22:10 UTC45m
2026-07-03 SAS89B ZRH → CPH Jul 3, 18:30 UTCJul 3, 20:00 UTC1h 30m
2026-07-03 SAS609 - Jul 3, 16:10 UTCJul 3, 17:30 UTC1h 20m
2026-07-03 SAS2893 - Jul 3, 13:50 UTCJul 3, 15:00 UTC1h 10m

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.

Mode-S 4CA1C9 frequently asked

What is Mode-S code 4CA1C9?
4CA1C9 is an ICAO 24-bit transponder address. Allocated to Ireland.
Where is Mode-S 4CA1C9 registered?
Mode-S code 4CA1C9 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CA1C9 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CA1C9, octal 23120711, decimal 5,022,153.
What flights does 4CA1C9 operate?
Mode-S 4CA1C9 has broadcast 20 distinct callsigns, including SAS742, SAS2536, SAS2535, SAS87R, SAS743.