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sensors Mode-S transponder

4CAF24

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-HSD · BOMBARDIER Regional Jet CRJ-900

Hex
4CAF24
Octal
23127444
Decimal
5,025,572
Country
IE
Tail
EI-HSD
Type
CRJ9
Broadcasting now · callsign SAS1644 · 7,850 ft
Flights observed
220
Distinct callsigns
20
Country
IE
Last broadcast
Jul 25, 07:10 UTC

Current position

4CAF24 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CAF24 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
SAS684 Scandinavian Airlines System 5 2026-07-20
SAS683 - 5 2026-07-20
SAS82T - 4 2026-07-21
SAS40L - 4 2026-07-21
SAS1772 Scandinavian Airlines System 4 2026-07-22
SAS1771 Scandinavian Airlines System 4 2026-07-23
SAS1713 - 4 2026-07-15
SAS1712 - 4 2026-07-15
SAS026 Scandinavian Airlines System 4 2026-07-24
SAS007 - 4 2026-07-22
SAS99A - 3 2026-07-14
SAS864 - 3 2026-07-11
SAS73C - 3 2026-07-14
SAS68H - 3 2026-07-14
SAS560 - 3 2026-07-14
SAS55P - 3 2026-07-11
SAS36F - 3 2026-07-20
SAS30U - 3 2026-07-20
SAS1790 Scandinavian Airlines System 3 2026-07-20
SAS1482 - 3 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 SAS1004 ARN → LLA Jul 25, 06:15 UTCJul 25, 07:00 UTC45m
2026-07-24 SAS026 ARN → UME Jul 24, 18:50 UTCJul 24, 19:30 UTC40m
2026-07-23 SAS1771 TLL → ARN Jul 23, 03:50 UTCJul 23, 04:40 UTC50m
2026-07-22 SAS1772 ARN → TLL Jul 22, 20:45 UTCJul 22, 21:30 UTC45m
2026-07-22 SAS019 LLA → ARN Jul 22, 16:25 UTCJul 22, 17:35 UTC1h 10m
2026-07-22 SAS016 ARN → LLA Jul 22, 14:45 UTCJul 22, 15:35 UTC50m
2026-07-22 SAS007 - Jul 22, 12:30 UTCJul 22, 13:35 UTC1h 5m
2026-07-22 SAS2050 LLA → GOT Jul 22, 11:10 UTCJul 22, 11:40 UTC30m
2026-07-22 SAS025 UME → ARN Jul 22, 04:00 UTCJul 22, 04:40 UTC40m
2026-07-21 SAS026 - Jul 21, 19:40 UTCJul 21, 20:15 UTC35m
2026-07-21 SAS1021 - Jul 21, 17:55 UTCJul 21, 18:45 UTC50m
2026-07-21 SAS59K - Jul 21, 16:15 UTCJul 21, 17:10 UTC55m
2026-07-21 SAS82T - Jul 21, 14:15 UTCJul 21, 14:55 UTC40m
2026-07-21 SAS40L ARN → TLL Jul 21, 12:55 UTCJul 21, 13:35 UTC40m
2026-07-21 SAS007 - Jul 21, 10:45 UTCJul 21, 11:45 UTC1h 0m
2026-07-21 SAS006 - Jul 21, 08:55 UTCJul 21, 09:55 UTC1h 0m
2026-07-21 SAS2023 UME → ARN Jul 21, 07:15 UTCJul 21, 08:00 UTC45m
2026-07-21 SAS024 ARN → UME Jul 21, 05:35 UTCJul 21, 06:10 UTC35m
2026-07-21 SAS1771 TLL → ARN Jul 21, 03:45 UTCJul 21, 04:20 UTC35m
2026-07-20 SAS1790 CPH → TLL Jul 20, 21:35 UTCJul 20, 22:15 UTC40m
2026-07-20 SAS1790 CPH → TLL Jul 20, 21:05 UTCJul 20, 21:25 UTC20m
2026-07-20 SAS2883 - Jul 20, 17:55 UTCJul 20, 19:10 UTC1h 15m
2026-07-20 SAS2886 - Jul 20, 15:50 UTCJul 20, 17:10 UTC1h 20m
2026-07-20 SAS30U TLL → CPH Jul 20, 13:20 UTCJul 20, 14:40 UTC1h 20m
2026-07-20 SAS36F CPH → TLL Jul 20, 10:55 UTCJul 20, 12:05 UTC1h 10m
2026-07-20 SAS684 CPH → MXP Jul 20, 07:25 UTCJul 20, 09:10 UTC1h 45m
2026-07-20 SAS683 CPH → MXP Jul 20, 04:30 UTCJul 20, 06:10 UTC1h 40m
2026-07-19 SAS2877 BGO → CPH Jul 19, 20:00 UTCJul 19, 21:10 UTC1h 10m
2026-07-19 SAS2876 CPH → BGO Jul 19, 18:05 UTCJul 19, 19:05 UTC1h 0m
2026-07-19 SAS48D AMS → CPH Jul 19, 15:55 UTCJul 19, 16:55 UTC1h 0m
2026-07-19 SAS1549 CPH → AMS Jul 19, 13:35 UTCJul 19, 14:35 UTC1h 0m
2026-07-19 SAS1869 - Jul 19, 11:20 UTCJul 19, 12:15 UTC55m
2026-07-19 SAS1868 - Jul 19, 09:40 UTCJul 19, 10:35 UTC55m
2026-07-19 SAS21M HAM → CPH Jul 19, 08:00 UTCJul 19, 08:35 UTC35m
2026-07-19 SAS1641 CPH → HAM Jul 19, 06:25 UTCJul 19, 06:55 UTC30m
2026-07-18 SAS42R - Jul 18, 13:10 UTCJul 18, 14:10 UTC1h 0m
2026-07-18 SAS87Y - Jul 18, 10:45 UTCJul 18, 11:50 UTC1h 5m
2026-07-18 SAS594 - Jul 18, 08:30 UTCJul 18, 09:35 UTC1h 5m
2026-07-18 SAS57B - Jul 18, 06:25 UTCJul 18, 07:35 UTC1h 10m
2026-07-18 SAS84P TLL → CPH Jul 18, 03:15 UTCJul 18, 04:30 UTC1h 15m
2026-07-17 SAS1772 ARN → TLL Jul 17, 21:20 UTCJul 17, 22:00 UTC40m
2026-07-17 SAS1482 BGO → ARN Jul 17, 18:00 UTCJul 17, 19:05 UTC1h 5m
2026-07-17 SAS1481 ARN → BGO Jul 17, 16:10 UTCJul 17, 17:20 UTC1h 10m
2026-07-17 SAS82T TLL → ARN Jul 17, 14:35 UTCJul 17, 15:20 UTC45m
2026-07-17 SAS40L ARN → TLL Jul 17, 12:55 UTCJul 17, 13:40 UTC45m
2026-07-17 SAS72C AMS → ARN Jul 17, 09:25 UTCJul 17, 10:55 UTC1h 30m
2026-07-17 SAS1553 - Jul 17, 06:25 UTCJul 17, 08:10 UTC1h 45m
2026-07-17 SAS025 - Jul 17, 04:35 UTCJul 17, 05:15 UTC40m
2026-07-16 SAS026 - Jul 16, 18:59 UTCJul 16, 19:40 UTC40m
2026-07-16 SAS1482 BGO → ARN Jul 16, 17:00 UTCJul 16, 18:05 UTC1h 5m

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 EI-HSD page for operator, model, and routing details .

Mode-S 4CAF24 frequently asked

What is Mode-S code 4CAF24?
4CAF24 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-HSD.
Where is Mode-S 4CAF24 registered?
Mode-S code 4CAF24 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAF24 broadcasting right now?
Yes. Mode-S 4CAF24 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAF24, octal 23127444, decimal 5,025,572.
What flights does 4CAF24 operate?
Mode-S 4CAF24 has broadcast 20 distinct callsigns, including SAS684, SAS683, SAS82T, SAS40L, SAS1772.