Apparatus

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sensors Mode-S transponder

4B15A3

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-IFB · AIRBUS A-350-900

Hex
4B15A3
Octal
22612643
Decimal
4,920,739
Country
CH
Tail
HB-IFB
Type
A359
No current signal · last broadcast 5h ago
Flights observed
117
Distinct callsigns
9
Country
CH
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S 4B15A3.

Country allocation

The ICAO 24-bit address 4B15A3 falls within the block assigned to Switzerland (CH) by ICAO Annex 10, Volume III. Every aircraft registered in Switzerland 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 9 distinct

Callsign Airline Flights Last seen
SWR123 Swiss International Air Lines 24 2026-05-30
SWR122 Swiss International Air Lines 24 2026-05-29
SWR54B Swiss International Air Lines 18 2026-05-27
SWR2V Swiss International Air Lines 18 2026-05-27
SWR4WF Swiss International Air Lines 9 2026-05-21
SWR3KH Swiss International Air Lines 9 2026-05-21
SWR52F Swiss International Air Lines 7 2026-05-20
SWR4WP Swiss International Air Lines 7 2026-05-20
SWR123D - 1 2026-05-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 SWR123 ICN → ZRH May 30, 00:50 UTCMay 30, 01:15 UTC25m
2026-05-29 SWR122 ZRH → ICN May 29, 22:05 UTCMay 29, 22:25 UTC20m
2026-05-29 SWR122 ZRH → ICN May 29, 11:45 UTCMay 29, 21:25 UTC9h 40m
2026-05-27 SWR2V BOS → ZRH May 27, 21:45 UTCMay 28, 04:30 UTC6h 45m
2026-05-27 SWR54B ZRH → BOS May 27, 11:30 UTCMay 27, 18:35 UTC7h 5m
2026-05-26 SWR2V BOS → ZRH May 26, 22:05 UTCMay 27, 04:49 UTC6h 45m
2026-05-26 SWR54B ZRH → BOS May 26, 11:24 UTCMay 26, 18:40 UTC7h 15m
2026-05-25 SWR2V BOS → ZRH May 25, 21:54 UTCMay 26, 04:39 UTC6h 45m
2026-05-25 SWR54B ZRH → BOS May 25, 11:25 UTCMay 25, 18:40 UTC7h 15m
2026-05-24 SWR2V BOS → ZRH May 24, 23:00 UTCMay 25, 04:35 UTC5h 35m
2026-05-24 SWR2V BOS → ZRH May 24, 21:45 UTCMay 24, 21:51 UTC6m
2026-05-24 SWR54B ZRH → BOS May 24, 11:40 UTCMay 24, 19:05 UTC7h 25m
2026-05-23 SWR123 ICN → ZRH May 23, 06:45 UTCMay 23, 13:45 UTC7h 0m
2026-05-23 SWR123 ICN → ZRH May 23, 01:15 UTCMay 23, 01:35 UTC20m
2026-05-22 SWR122 ZRH → ICN May 22, 22:50 UTCMay 22, 23:05 UTC15m
2026-05-22 SWR122 ZRH → ICN May 22, 12:15 UTCMay 22, 16:05 UTC3h 50m
2026-05-21 SWR3KH PRG → ZRH May 21, 07:50 UTCMay 21, 08:45 UTC55m
2026-05-21 SWR4WF ZRH → PRG May 21, 05:25 UTCMay 21, 06:25 UTC1h 0m
2026-05-20 SWR52F DUS → ZRH May 20, 18:15 UTCMay 20, 19:00 UTC45m
2026-05-20 SWR4WP ZRH → DUS May 20, 15:35 UTCMay 20, 16:40 UTC1h 5m
2026-05-20 SWR123 ICN → ZRH May 20, 01:05 UTCMay 20, 13:30 UTC12h 26m
2026-05-19 SWR122 ZRH → ICN May 19, 22:30 UTCMay 19, 22:50 UTC20m
2026-05-19 SWR122 ZRH → ICN May 19, 11:55 UTCMay 19, 21:45 UTC9h 50m
2026-05-19 SWR3KH PRG → ZRH May 19, 07:45 UTCMay 19, 08:45 UTC1h 0m
2026-05-19 SWR4WF ZRH → PRG May 19, 05:25 UTCMay 19, 06:25 UTC1h 0m
2026-05-18 SWR52F DUS → ZRH May 18, 18:25 UTCMay 18, 19:15 UTC49m
2026-05-18 SWR4WP ZRH → DUS May 18, 16:00 UTCMay 18, 16:50 UTC50m
2026-05-18 SWR123 ICN → ZRH May 18, 01:00 UTCMay 18, 13:35 UTC12h 35m
2026-05-17 SWR122 ZRH → ICN May 17, 22:35 UTCMay 17, 22:55 UTC20m
2026-05-17 SWR122 ZRH → ICN May 17, 12:05 UTCMay 17, 21:50 UTC9h 45m
2026-05-16 SWR2V BOS → ZRH May 16, 21:55 UTCMay 17, 04:30 UTC6h 35m
2026-05-16 SWR54B ZRH → BOS May 16, 11:25 UTCMay 16, 19:00 UTC7h 35m
2026-05-15 SWR2V BOS → ZRH May 15, 21:50 UTCMay 16, 04:15 UTC6h 25m
2026-05-15 SWR54B ZRH → BOS May 15, 11:35 UTCMay 15, 19:20 UTC7h 44m
2026-05-14 SWR3KH PRG → ZRH May 14, 07:45 UTCMay 14, 08:50 UTC1h 5m
2026-05-14 SWR4WF ZRH → PRG May 14, 05:20 UTCMay 14, 06:20 UTC1h 0m
2026-05-13 SWR52F DUS → ZRH May 13, 18:25 UTCMay 13, 19:15 UTC50m
2026-05-13 SWR4WP ZRH → DUS May 13, 16:00 UTCMay 13, 16:50 UTC50m
2026-05-13 SWR123 ICN → ZRH May 13, 06:00 UTCMay 13, 13:31 UTC7h 30m
2026-05-12 SWR122 ZRH → ICN May 12, 11:45 UTCMay 12, 15:20 UTC3h 35m
2026-05-12 SWR3KH PRG → ZRH May 12, 07:55 UTCMay 12, 08:50 UTC55m
2026-05-12 SWR4WF ZRH → PRG May 12, 05:30 UTCMay 12, 06:20 UTC50m
2026-05-11 SWR52F DUS → ZRH May 11, 18:40 UTCMay 11, 19:35 UTC55m
2026-05-11 SWR4WP ZRH → DUS May 11, 16:15 UTCMay 11, 17:05 UTC51m
2026-05-11 SWR123 ICN → ZRH May 11, 06:20 UTCMay 11, 13:40 UTC7h 20m
2026-05-11 SWR123 ICN → ZRH May 11, 01:15 UTCMay 11, 01:25 UTC10m
2026-05-10 SWR122 ZRH → ICN May 10, 12:10 UTCMay 10, 18:29 UTC6h 20m
2026-05-09 SWR123 ICN → ZRH May 9, 02:15 UTCMay 9, 13:45 UTC11h 30m
2026-05-08 SWR122 ZRH → ICN May 8, 22:30 UTCMay 8, 22:40 UTC10m
2026-05-08 SWR122 ZRH → ICN May 8, 11:55 UTCMay 8, 21:40 UTC9h 45m

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 HB-IFB page for operator, model, and routing details .

Mode-S 4B15A3 frequently asked

What is Mode-S code 4B15A3?
4B15A3 is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-IFB.
Where is Mode-S 4B15A3 registered?
Mode-S code 4B15A3 is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B15A3 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B15A3, octal 22612643, decimal 4,920,739.
What flights does 4B15A3 operate?
Mode-S 4B15A3 has broadcast 9 distinct callsigns, including SWR123, SWR122, SWR54B, SWR2V, SWR4WF.