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 Jul 26, 22:45 UTC
Flights observed
236
Distinct callsigns
11
Country
CH
Last broadcast
Jul 26, 22:45 UTC

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 11 distinct

Callsign Airline Flights Last seen
SWR54B Swiss International Air Lines 56 2026-07-26
SWR2V Swiss International Air Lines 55 2026-07-26
SWR123 Swiss International Air Lines 40 2026-07-25
SWR122 Swiss International Air Lines 40 2026-07-24
SWR4WF Swiss International Air Lines 12 2026-07-23
SWR3KH Swiss International Air Lines 12 2026-07-23
SWR52F Swiss International Air Lines 8 2026-06-15
SWR4WP Swiss International Air Lines 8 2026-06-15
SWR351E - 2 2026-07-15
SWR1T - 2 2026-07-15
SWR123D - 1 2026-05-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWR2V BOS → ZRH Jul 26, 21:45 UTCJul 26, 22:45 UTC1h 0m
2026-07-26 SWR54B ZRH → BOS Jul 26, 11:35 UTCJul 26, 19:05 UTC7h 30m
2026-07-25 SWR123 ICN → ZRH Jul 25, 02:25 UTCJul 25, 13:30 UTC11h 5m
2026-07-25 SWR123 ICN → ZRH Jul 25, 01:15 UTCJul 25, 01:40 UTC25m
2026-07-24 SWR122 ZRH → ICN Jul 24, 12:00 UTCJul 24, 22:40 UTC10h 40m
2026-07-23 SWR2V BOS → ZRH Jul 23, 21:35 UTCJul 24, 04:10 UTC6h 35m
2026-07-23 SWR54B ZRH → BOS Jul 23, 11:35 UTCJul 23, 18:50 UTC7h 15m
2026-07-23 SWR3KH PRG → ZRH Jul 23, 07:45 UTCJul 23, 08:45 UTC1h 0m
2026-07-23 SWR4WF ZRH → PRG Jul 23, 05:20 UTCJul 23, 06:15 UTC55m
2026-07-22 SWR123 ICN → ZRH Jul 22, 02:25 UTCJul 22, 13:40 UTC11h 15m
2026-07-22 SWR123 ICN → ZRH Jul 22, 01:05 UTCJul 22, 01:30 UTC25m
2026-07-21 SWR122 ZRH → ICN Jul 21, 12:15 UTCJul 21, 22:35 UTC10h 20m
2026-07-20 SWR2V BOS → ZRH Jul 20, 21:30 UTCJul 21, 04:05 UTC6h 34m
2026-07-20 SWR54B ZRH → BOS Jul 20, 11:25 UTCJul 20, 19:05 UTC7h 40m
2026-07-19 SWR2V BOS → ZRH Jul 19, 21:30 UTCJul 20, 04:10 UTC6h 40m
2026-07-19 SWR54B ZRH → BOS Jul 19, 11:30 UTCJul 19, 19:05 UTC7h 35m
2026-07-18 SWR123 ICN → ZRH Jul 18, 02:00 UTCJul 18, 13:30 UTC11h 31m
2026-07-18 SWR123 - Jul 18, 00:50 UTCJul 18, 01:10 UTC20m
2026-07-17 SWR122 ZRH → ICN Jul 17, 12:00 UTCJul 17, 22:10 UTC10h 10m
2026-07-16 SWR2V BOS → ZRH Jul 16, 21:50 UTCJul 17, 04:35 UTC6h 45m
2026-07-16 SWR54B ZRH → BOS Jul 16, 11:20 UTCJul 16, 18:59 UTC7h 40m
2026-07-16 SWR3KH PRG → ZRH Jul 16, 07:50 UTCJul 16, 08:55 UTC1h 5m
2026-07-16 SWR4WF ZRH → PRG Jul 16, 05:25 UTCJul 16, 06:20 UTC55m
2026-07-15 SWR1T NCE → ZRH Jul 15, 18:55 UTCJul 15, 19:45 UTC50m
2026-07-15 SWR351E ZRH → NCE Jul 15, 16:05 UTCJul 15, 16:55 UTC50m
2026-07-15 SWR123 - Jul 15, 00:55 UTCJul 15, 13:35 UTC12h 40m
2026-07-14 SWR122 - Jul 14, 22:00 UTCJul 14, 22:25 UTC25m
2026-07-14 SWR122 - Jul 14, 12:00 UTCJul 14, 21:20 UTC9h 20m
2026-07-13 SWR2V BOS → ZRH Jul 13, 21:30 UTCJul 14, 04:15 UTC6h 45m
2026-07-13 SWR54B ZRH → BOS Jul 13, 11:40 UTCJul 13, 19:00 UTC7h 20m
2026-07-12 SWR2V BOS → ZRH Jul 12, 21:35 UTCJul 13, 04:20 UTC6h 45m
2026-07-12 SWR54B ZRH → BOS Jul 12, 11:35 UTCJul 12, 19:01 UTC7h 25m
2026-07-11 SWR123 - Jul 11, 02:05 UTCJul 11, 13:30 UTC11h 25m
2026-07-11 SWR123 - Jul 11, 00:55 UTCJul 11, 01:10 UTC15m
2026-07-10 SWR122 ZRH → ICN Jul 10, 11:55 UTCJul 10, 22:15 UTC10h 20m
2026-07-09 SWR2V BOS → ZRH Jul 9, 21:50 UTCJul 10, 04:25 UTC6h 35m
2026-07-09 SWR54B ZRH → BOS Jul 9, 12:20 UTCJul 9, 19:50 UTC7h 30m
2026-07-08 SWR2V BOS → ZRH Jul 8, 21:55 UTCJul 9, 04:35 UTC6h 40m
2026-07-08 SWR54B ZRH → BOS Jul 8, 12:20 UTCJul 8, 19:40 UTC7h 20m
2026-07-07 SWR2V BOS → ZRH Jul 7, 21:35 UTCJul 8, 04:15 UTC6h 40m
2026-07-07 SWR54B ZRH → BOS Jul 7, 11:30 UTCJul 7, 18:50 UTC7h 20m
2026-07-06 SWR2V BOS → ZRH Jul 6, 22:15 UTCJul 7, 04:45 UTC6h 30m
2026-07-06 SWR54B ZRH → BOS Jul 6, 11:35 UTCJul 6, 19:10 UTC7h 35m
2026-07-05 SWR2V BOS → ZRH Jul 5, 22:15 UTCJul 6, 04:35 UTC6h 20m
2026-07-05 SWR54B ZRH → BOS Jul 5, 12:15 UTCJul 5, 19:55 UTC7h 40m
2026-07-04 SWR2V BOS → ZRH Jul 4, 21:50 UTCJul 5, 04:20 UTC6h 30m
2026-07-04 SWR54B ZRH → BOS Jul 4, 11:40 UTCJul 4, 19:30 UTC7h 50m
2026-07-03 SWR2V BOS → ZRH Jul 3, 22:25 UTCJul 4, 04:55 UTC6h 30m
2026-07-03 SWR54B ZRH → BOS Jul 3, 12:15 UTCJul 3, 19:55 UTC7h 40m
2026-07-02 SWR2V BOS → ZRH Jul 2, 21:50 UTCJul 3, 04:10 UTC6h 20m

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 Jul 26, 22:45 UTC.
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 11 distinct callsigns, including SWR54B, SWR2V, SWR123, SWR122, SWR4WF.