Apparatus

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sensors Mode-S transponder

4B15A2

ICAO 24-bit transponder address · allocated to Switzerland

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

Hex
4B15A2
Octal
22612642
Decimal
4,920,738
Country
CH
Tail
HB-IFA
Type
A359
Transponder active on ground
Flights observed
232
Distinct callsigns
10
Country
CH
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 4B15A2.

Country allocation

The ICAO 24-bit address 4B15A2 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 10 distinct

Callsign Airline Flights Last seen
SWR54B - 57 2026-07-11
SWR2V - 54 2026-07-11
SWR122 - 41 2026-07-12
SWR123 - 35 2026-07-13
SWR3KH - 10 2026-07-14
SWR52F Swiss International Air Lines 9 2026-06-24
SWR4WP Swiss International Air Lines 9 2026-06-24
SWR4WF - 8 2026-07-14
SWR351E - 4 2026-07-13
SWR1T - 4 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWR3KH PRG → ZRH Jul 14, 08:20 UTCJul 14, 09:20 UTC1h 0m
2026-07-14 SWR4WF ZRH → PRG Jul 14, 05:50 UTCJul 14, 06:45 UTC55m
2026-07-13 SWR1T NCE → ZRH Jul 13, 18:30 UTCJul 13, 19:20 UTC50m
2026-07-13 SWR351E ZRH → NCE Jul 13, 16:05 UTCJul 13, 17:00 UTC55m
2026-07-13 SWR123 - Jul 13, 02:15 UTCJul 13, 13:40 UTC11h 25m
2026-07-13 SWR123 - Jul 13, 01:01 UTCJul 13, 01:20 UTC20m
2026-07-12 SWR122 - Jul 12, 22:40 UTCJul 12, 23:00 UTC20m
2026-07-12 SWR122 - Jul 12, 12:40 UTCJul 12, 22:00 UTC9h 20m
2026-07-11 SWR2V BOS → ZRH Jul 11, 21:40 UTCJul 12, 04:15 UTC6h 35m
2026-07-11 SWR54B ZRH → BOS Jul 11, 11:35 UTCJul 11, 19:05 UTC7h 30m
2026-07-10 SWR2V BOS → ZRH Jul 10, 21:40 UTCJul 11, 04:15 UTC6h 35m
2026-07-10 SWR54B ZRH → BOS Jul 10, 11:30 UTCJul 10, 19:05 UTC7h 35m
2026-07-09 SWR3KH PRG → ZRH Jul 9, 08:00 UTCJul 9, 08:55 UTC55m
2026-07-09 SWR4WF ZRH → PRG Jul 9, 05:25 UTCJul 9, 06:25 UTC1h 0m
2026-07-08 SWR1T NCE → ZRH Jul 8, 18:15 UTCJul 8, 19:10 UTC55m
2026-07-08 SWR351E ZRH → NCE Jul 8, 16:00 UTCJul 8, 16:55 UTC55m
2026-07-08 SWR123 - Jul 8, 02:20 UTCJul 8, 13:55 UTC11h 35m
2026-07-08 SWR123 - Jul 8, 01:00 UTCJul 8, 01:20 UTC20m
2026-07-07 SWR122 - Jul 7, 22:25 UTCJul 7, 22:50 UTC25m
2026-07-07 SWR122 - Jul 7, 12:20 UTCJul 7, 21:45 UTC9h 25m
2026-07-07 SWR3KH PRG → ZRH Jul 7, 07:55 UTCJul 7, 08:50 UTC55m
2026-07-07 SWR4WF ZRH → PRG Jul 7, 05:35 UTCJul 7, 06:25 UTC50m
2026-07-06 SWR1T NCE → ZRH Jul 6, 19:00 UTCJul 6, 19:55 UTC55m
2026-07-06 SWR351E ZRH → NCE Jul 6, 16:40 UTCJul 6, 17:30 UTC50m
2026-07-06 SWR123 ICN → ZRH Jul 6, 01:30 UTCJul 6, 14:00 UTC12h 30m
2026-07-05 SWR122 - Jul 5, 22:45 UTCJul 5, 23:05 UTC20m
2026-07-05 SWR122 - Jul 5, 12:40 UTCJul 5, 22:05 UTC9h 25m
2026-07-04 SWR123 - Jul 4, 02:25 UTCJul 4, 13:50 UTC11h 25m
2026-07-04 SWR123 - Jul 4, 01:20 UTCJul 4, 01:35 UTC15m
2026-07-03 SWR122 - Jul 3, 22:40 UTCJul 3, 23:05 UTC25m
2026-07-03 SWR122 - Jul 3, 12:35 UTCJul 3, 22:00 UTC9h 25m
2026-07-02 SWR3KH PRG → ZRH Jul 2, 08:20 UTCJul 2, 09:15 UTC55m
2026-07-02 SWR4WF ZRH → PRG Jul 2, 05:25 UTCJul 2, 06:20 UTC55m
2026-07-01 SWR1T NCE → ZRH Jul 1, 18:50 UTCJul 1, 19:45 UTC55m
2026-07-01 SWR351E ZRH → NCE Jul 1, 16:10 UTCJul 1, 17:10 UTC1h 0m
2026-07-01 SWR123 - Jul 1, 03:05 UTCJul 1, 14:10 UTC11h 5m
2026-07-01 SWR123 - Jul 1, 01:50 UTCJul 1, 02:10 UTC20m
2026-06-30 SWR122 ZRH → ICN Jun 30, 12:55 UTCJun 30, 23:35 UTC10h 40m
2026-06-29 SWR2V BOS → ZRH Jun 29, 22:00 UTCJun 30, 04:20 UTC6h 21m
2026-06-29 SWR54B ZRH → BOS Jun 29, 11:35 UTCJun 29, 18:55 UTC7h 20m
2026-06-28 SWR2V BOS → ZRH Jun 28, 22:04 UTCJun 29, 04:25 UTC6h 20m
2026-06-28 SWR54B ZRH → BOS Jun 28, 12:25 UTCJun 28, 19:59 UTC7h 35m
2026-06-27 SWR123 - Jun 27, 01:54 UTCJun 27, 13:24 UTC11h 30m
2026-06-27 SWR123 - Jun 27, 00:44 UTCJun 27, 01:00 UTC15m
2026-06-26 SWR122 - Jun 26, 22:05 UTCJun 26, 22:29 UTC25m
2026-06-26 SWR122 - Jun 26, 11:55 UTCJun 26, 21:24 UTC9h 30m
2026-06-25 SWR3KH PRG → ZRH Jun 25, 07:54 UTCJun 25, 08:50 UTC55m
2026-06-25 SWR4WF ZRH → PRG Jun 25, 05:20 UTCJun 25, 06:20 UTC1h 0m
2026-06-24 SWR52F DUS → ZRH Jun 24, 18:05 UTCJun 24, 18:50 UTC45m
2026-06-24 SWR4WP ZRH → DUS Jun 24, 15:44 UTCJun 24, 16:40 UTC55m

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-IFA page for operator, model, and routing details .

Mode-S 4B15A2 frequently asked

What is Mode-S code 4B15A2?
4B15A2 is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-IFA.
Where is Mode-S 4B15A2 registered?
Mode-S code 4B15A2 is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B15A2 broadcasting right now?
Mode-S 4B15A2 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B15A2, octal 22612642, decimal 4,920,738.
What flights does 4B15A2 operate?
Mode-S 4B15A2 has broadcast 10 distinct callsigns, including SWR54B, SWR2V, SWR122, SWR123, SWR3KH.