Apparatus

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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 27d ago
Flights observed
376
Distinct callsigns
20
Country
IE
Last broadcast
27d 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 Scandinavian Airlines System 8 2026-07-24
SAS87R Scandinavian Airlines System 6 2026-07-26
SAS743 Scandinavian Airlines System 6 2026-07-25
SAS34J Scandinavian Airlines System 6 2026-07-26
SAS2536 Scandinavian Airlines System 6 2026-07-23
SAS2535 Scandinavian Airlines System 6 2026-07-23
SAS84P - 5 2026-07-20
SAS55L Scandinavian Airlines System 5 2026-07-21
SAS21M Scandinavian Airlines System 5 2026-07-21
SAS1680 Scandinavian Airlines System 5 2026-07-21
SAS1641 Scandinavian Airlines System 5 2026-07-21
SAS48D Scandinavian Airlines System 4 2026-07-21
SAS1790 - 4 2026-07-15
SAS1549 Scandinavian Airlines System 4 2026-07-21
SAS98K Scandinavian Airlines System 3 2026-07-26
SAS89B - 3 2026-07-22
SAS82T - 3 2026-07-08
SAS753 Scandinavian Airlines System 3 2026-07-25
SAS745 - 3 2026-06-18
SAS69B Scandinavian Airlines System 3 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SAS2752 WAW → CPH Jul 26, 17:50 UTCJul 26, 18:55 UTC1h 5m
2026-07-26 SAS2751 CPH → WAW Jul 26, 15:45 UTCJul 26, 16:45 UTC1h 0m
2026-07-26 SAS87R VNO → CPH Jul 26, 13:15 UTCJul 26, 14:30 UTC1h 15m
2026-07-26 SAS34J CPH → VNO Jul 26, 11:10 UTCJul 26, 12:20 UTC1h 10m
2026-07-26 SAS69B KRK → CPH Jul 26, 08:15 UTCJul 26, 09:30 UTC1h 15m
2026-07-26 SAS98K CPH → KRK Jul 26, 06:00 UTCJul 26, 07:05 UTC1h 6m
2026-07-26 SAS1758 GDN → CPH Jul 26, 04:25 UTCJul 26, 04:40 UTC15m
2026-07-25 SAS753 CPH → GDN Jul 25, 21:55 UTCJul 25, 22:35 UTC40m
2026-07-25 SAS776 MPL → CPH Jul 25, 19:05 UTCJul 25, 21:10 UTC2h 5m
2026-07-25 SAS775 CPH → MPL Jul 25, 14:55 UTCJul 25, 16:55 UTC2h 0m
2026-07-25 SAS44T GDN → CPH Jul 25, 12:55 UTCJul 25, 13:25 UTC30m
2026-07-25 SAS75G CPH → GDN Jul 25, 11:20 UTCJul 25, 12:00 UTC40m
2026-07-25 SAS89T ZRH → CPH Jul 25, 08:50 UTCJul 25, 10:15 UTC1h 25m
2026-07-25 SAS601 CPH → ZRH Jul 25, 06:15 UTCJul 25, 07:40 UTC1h 25m
2026-07-25 SAS743 VNO → CPH Jul 25, 03:15 UTCJul 25, 04:30 UTC1h 15m
2026-07-24 SAS742 CPH → VNO Jul 24, 21:45 UTCJul 24, 22:55 UTC1h 10m
2026-07-24 SAS57R MUC → CPH Jul 24, 19:20 UTCJul 24, 20:40 UTC1h 20m
2026-07-24 SAS2657 CPH → MUC Jul 24, 17:20 UTCJul 24, 18:35 UTC1h 15m
2026-07-24 SAS22P GVA → CPH Jul 24, 09:20 UTCJul 24, 11:05 UTC1h 45m
2026-07-24 SAS613 CPH → GVA Jul 24, 06:20 UTCJul 24, 08:00 UTC1h 40m
2026-07-23 SAS2536 BHX → CPH Jul 23, 18:25 UTCJul 23, 19:50 UTC1h 25m
2026-07-23 SAS2535 CPH → BHX Jul 23, 15:40 UTCJul 23, 17:15 UTC1h 35m
2026-07-23 SAS87R VNO → CPH Jul 23, 13:10 UTCJul 23, 14:30 UTC1h 20m
2026-07-23 SAS34J CPH → VNO Jul 23, 11:00 UTCJul 23, 12:10 UTC1h 10m
2026-07-23 SAS99A TRD → CPH Jul 23, 08:20 UTCJul 23, 09:30 UTC1h 10m
2026-07-23 SAS68H CPH → TRD Jul 23, 06:15 UTCJul 23, 07:45 UTC1h 30m
2026-07-23 SAS743 VNO → CPH Jul 23, 03:20 UTCJul 23, 04:35 UTC1h 15m
2026-07-22 SAS742 CPH → VNO Jul 22, 21:15 UTCJul 22, 22:35 UTC1h 20m
2026-07-22 SAS89B ZRH → CPH Jul 22, 18:55 UTCJul 22, 20:20 UTC1h 25m
2026-07-22 SAS609 CPH → ZRH Jul 22, 16:15 UTCJul 22, 17:40 UTC1h 25m
2026-07-22 SAS1643 RIX → CPH Jul 22, 13:00 UTCJul 22, 14:10 UTC1h 10m
2026-07-22 SAS1642 CPH → RIX Jul 22, 11:30 UTCJul 22, 12:05 UTC35m
2026-07-21 SAS1680 BER → CPH Jul 21, 19:35 UTCJul 21, 20:20 UTC45m
2026-07-21 SAS55L CPH → BER Jul 21, 17:55 UTCJul 21, 18:35 UTC40m
2026-07-21 SAS48D AMS → CPH Jul 21, 15:45 UTCJul 21, 16:45 UTC1h 0m
2026-07-21 SAS1549 CPH → AMS Jul 21, 13:30 UTCJul 21, 14:30 UTC1h 0m
2026-07-21 SAS2867 BGO → CPH Jul 21, 11:30 UTCJul 21, 12:35 UTC1h 5m
2026-07-21 SAS2866 CPH → BGO Jul 21, 09:45 UTCJul 21, 10:45 UTC1h 0m
2026-07-21 SAS21M HAM → CPH Jul 21, 08:05 UTCJul 21, 08:35 UTC30m
2026-07-21 SAS1641 CPH → HAM Jul 21, 06:30 UTCJul 21, 07:00 UTC30m
2026-07-21 SAS1705 HEL → CPH Jul 21, 03:40 UTCJul 21, 05:05 UTC1h 25m
2026-07-20 SAS45T CPH → HEL Jul 20, 21:25 UTCJul 20, 22:40 UTC1h 15m
2026-07-20 SAS1794 LYS → CPH Jul 20, 13:25 UTCJul 20, 15:20 UTC1h 55m
2026-07-20 SAS1793 CPH → LYS Jul 20, 10:35 UTCJul 20, 12:25 UTC1h 50m
2026-07-20 SAS658 STR → CPH Jul 20, 08:20 UTCJul 20, 09:35 UTC1h 15m
2026-07-20 SAS657 CPH → STR Jul 20, 06:15 UTCJul 20, 07:30 UTC1h 15m
2026-07-20 SAS84P TLL → CPH Jul 20, 03:15 UTCJul 20, 04:35 UTC1h 20m
2026-07-19 SAS1772 ARN → TLL Jul 19, 20:00 UTCJul 19, 20:40 UTC40m
2026-07-19 SAS1830 NCE → ARN Jul 19, 16:05 UTCJul 19, 18:40 UTC2h 35m
2026-07-19 SAS1829 ARN → NCE Jul 19, 12:00 UTCJul 19, 14:50 UTC2h 50m

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 27d 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, SAS87R, SAS743, SAS34J, SAS2536.