Apparatus

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sensors Mode-S transponder

4CAF16

ICAO 24-bit transponder address · allocated to Ireland

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

Hex
4CAF16
Octal
23127426
Decimal
5,025,558
Country
IE
Tail
EI-HSF
Type
CRJ9
Broadcasting now · callsign SAS41T · 35,000 ft
Flights observed
308
Distinct callsigns
20
Country
IE
Last broadcast
8h ago

Current position

4CAF16 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CAF16 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
SAS662 Scandinavian Airlines System 6 2026-05-22
SAS661 Scandinavian Airlines System 6 2026-05-22
SAS2987 Scandinavian Airlines System 6 2026-04-30
SAS2986 Scandinavian Airlines System 6 2026-04-30
SAS696 Scandinavian Airlines System 5 2026-05-18
SAS695 Scandinavian Airlines System 5 2026-05-18
SAS648 Scandinavian Airlines System 5 2026-05-23
SAS2892 Scandinavian Airlines System 5 2026-05-25
SAS99A Scandinavian Airlines System 4 2026-05-24
SAS86P - 4 2026-05-22
SAS766 Scandinavian Airlines System 4 2026-05-03
SAS740 Scandinavian Airlines System 4 2026-05-29
SAS68H Scandinavian Airlines System 4 2026-05-24
SAS668 Scandinavian Airlines System 4 2026-05-22
SAS647 Scandinavian Airlines System 4 2026-05-22
SAS57F Scandinavian Airlines System 4 2026-04-16
SAS41T Scandinavian Airlines System 4 2026-05-29
SAS29Z Scandinavian Airlines System 4 2026-05-28
SAS2645 Scandinavian Airlines System 4 2026-05-28
SAS2582 Scandinavian Airlines System 4 2026-04-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 SAS1740 ARN → VNO May 29, 18:40 UTCMay 29, 19:40 UTC1h 0m
2026-05-29 SAS739 VNO → ARN May 29, 15:10 UTCMay 29, 16:25 UTC1h 15m
2026-05-29 SAS740 ARN → VNO May 29, 13:20 UTCMay 29, 14:20 UTC1h 0m
2026-05-29 SAS84B UME → ARN May 29, 11:30 UTCMay 29, 12:10 UTC40m
2026-05-29 SAS2026 ARN → UME May 29, 09:55 UTCMay 29, 10:30 UTC35m
2026-05-29 SAS81C SFT → ARN May 29, 08:10 UTCMay 29, 09:00 UTC50m
2026-05-29 SAS69N ARN → SFT May 29, 06:25 UTCMay 29, 07:20 UTC55m
2026-05-29 SAS41T VNO → ARN May 29, 03:55 UTCMay 29, 05:20 UTC1h 25m
2026-05-28 SAS1740 ARN → VNO May 28, 18:45 UTCMay 28, 19:45 UTC1h 0m
2026-05-28 SAS184 AGH → ARN May 28, 16:05 UTCMay 28, 16:55 UTC50m
2026-05-28 SAS183 AGH → ARN May 28, 14:35 UTCMay 28, 15:20 UTC45m
2026-05-28 SAS29Z HAM → ARN May 28, 11:50 UTCMay 28, 13:10 UTC1h 20m
2026-05-28 SAS2645 ARN → HAM May 28, 09:45 UTCMay 28, 10:55 UTC1h 10m
2026-05-28 SAS073 OSD → ARN May 28, 07:55 UTCMay 28, 08:40 UTC45m
2026-05-28 SAS066 ARN → OSD May 28, 06:35 UTCMay 28, 07:20 UTC45m
2026-05-28 SAS1771 TLL → ARN May 28, 04:10 UTCMay 28, 04:55 UTC45m
2026-05-27 SAS1772 ARN → TLL May 27, 20:10 UTCMay 27, 21:00 UTC50m
2026-05-27 SAS1498 BLL → ARN May 27, 17:50 UTCMay 27, 19:00 UTC1h 10m
2026-05-27 SAS1497 ARN → BLL May 27, 16:00 UTCMay 27, 17:05 UTC1h 5m
2026-05-27 SAS82T TLL → ARN May 27, 13:05 UTCMay 27, 13:55 UTC50m
2026-05-27 SAS40L ARN → TLL May 27, 11:25 UTCMay 27, 12:10 UTC45m
2026-05-27 SAS2498 BLL → ARN May 27, 08:20 UTCMay 27, 09:35 UTC1h 15m
2026-05-27 SAS2497 ARN → BLL May 27, 06:34 UTCMay 27, 07:35 UTC1h 0m
2026-05-27 SAS41T VNO → ARN May 27, 03:54 UTCMay 27, 05:14 UTC1h 20m
2026-05-26 SAS1740 ARN → VNO May 26, 18:40 UTCMay 26, 19:40 UTC1h 0m
2026-05-26 SAS739 VNO → ARN May 26, 15:09 UTCMay 26, 16:40 UTC1h 30m
2026-05-26 SAS740 ARN → VNO May 26, 13:24 UTCMay 26, 14:24 UTC1h 0m
2026-05-26 SAS898 BGO → ARN May 26, 11:34 UTCMay 26, 12:30 UTC55m
2026-05-26 SAS899 ARN → BGO May 26, 09:35 UTCMay 26, 10:54 UTC1h 20m
2026-05-26 SAS073 OSD → ARN May 26, 07:40 UTCMay 26, 08:19 UTC40m
2026-05-26 SAS066 ARN → OSD May 26, 06:20 UTCMay 26, 07:10 UTC50m
2026-05-26 SAS41T VNO → ARN May 26, 04:00 UTCMay 26, 05:20 UTC1h 20m
2026-05-25 SAS742 CPH → VNO May 25, 21:04 UTCMay 25, 22:10 UTC1h 5m
2026-05-25 SAS2584 LUX → CPH May 25, 17:55 UTCMay 25, 19:10 UTC1h 15m
2026-05-25 SAS2583 CPH → LUX May 25, 16:00 UTCMay 25, 17:15 UTC1h 15m
2026-05-25 SAS2892 CPH → AES May 25, 13:05 UTCMay 25, 14:10 UTC1h 5m
2026-05-25 SAS2892 CPH → AES May 25, 10:55 UTCMay 25, 12:05 UTC1h 10m
2026-05-25 SAS684 CPH → MXP May 25, 07:30 UTCMay 25, 09:20 UTC1h 50m
2026-05-25 SAS683 MXP → CPH May 25, 04:30 UTCMay 25, 06:15 UTC1h 45m
2026-05-24 SAS57R MUC → CPH May 24, 18:35 UTCMay 24, 19:50 UTC1h 15m
2026-05-24 SAS2657 CPH → MUC May 24, 16:25 UTCMay 24, 17:35 UTC1h 10m
2026-05-24 SAS87R VNO → CPH May 24, 13:00 UTCMay 24, 14:25 UTC1h 25m
2026-05-24 SAS34J CPH → VNO May 24, 11:00 UTCMay 24, 12:10 UTC1h 10m
2026-05-24 SAS99A TRD → CPH May 24, 08:15 UTCMay 24, 09:30 UTC1h 15m
2026-05-24 SAS68H CPH → TRD May 24, 06:10 UTCMay 24, 07:35 UTC1h 25m
2026-05-23 SAS762 BUD → CPH May 23, 17:50 UTCMay 23, 19:25 UTC1h 35m
2026-05-23 SAS55N CPH → BUD May 23, 15:30 UTCMay 23, 17:00 UTC1h 30m
2026-05-23 SAS1248 AAR → CPH May 23, 12:25 UTCMay 23, 12:45 UTC20m
2026-05-23 SAS1247 CPH → AAR May 23, 11:20 UTCMay 23, 11:40 UTC20m
2026-05-23 SAS1609 RIX → CPH May 23, 08:50 UTCMay 23, 10:00 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.

Prefer a tail-number view? See the EI-HSF page for operator, model, and routing details .

Mode-S 4CAF16 frequently asked

What is Mode-S code 4CAF16?
4CAF16 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-HSF.
Where is Mode-S 4CAF16 registered?
Mode-S code 4CAF16 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAF16 broadcasting right now?
Yes. Mode-S 4CAF16 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAF16, octal 23127426, decimal 5,025,558.
What flights does 4CAF16 operate?
Mode-S 4CAF16 has broadcast 20 distinct callsigns, including SAS662, SAS661, SAS2987, SAS2986, SAS696.