Apparatus

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sensors Mode-S transponder

4B31FF

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-SYH · PIPSTREL Virus

Hex
4B31FF
Octal
22630777
Decimal
4,927,999
Country
CH
Tail
HB-SYH
Type
PIVI
No current signal · last broadcast 12h ago
Flights observed
61
Distinct callsigns
1
Country
CH
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S 4B31FF.

Country allocation

The ICAO 24-bit address 4B31FF 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 1 distinct

Callsign Airline Flights Last seen
HBSYH - 61 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 HBSYH - Jul 25, 07:05 UTCJul 25, 07:30 UTC25m
2026-07-24 HBSYH - Jul 24, 17:35 UTCJul 24, 18:10 UTC35m
2026-07-23 HBSYH - Jul 23, 14:20 UTCJul 23, 14:50 UTC30m
2026-07-23 HBSYH - Jul 23, 12:15 UTCJul 23, 12:40 UTC25m
2026-07-23 HBSYH - Jul 23, 08:55 UTCJul 23, 09:35 UTC40m
2026-07-23 HBSYH - Jul 23, 07:00 UTCJul 23, 07:40 UTC40m
2026-07-22 HBSYH - Jul 22, 15:45 UTCJul 22, 16:10 UTC25m
2026-07-22 HBSYH - Jul 22, 14:30 UTCJul 22, 14:50 UTC20m
2026-07-22 HBSYH - Jul 22, 11:15 UTCJul 22, 11:50 UTC35m
2026-07-21 HBSYH - Jul 21, 13:35 UTCJul 21, 14:10 UTC35m
2026-07-21 HBSYH - Jul 21, 09:00 UTCJul 21, 09:35 UTC35m
2026-07-17 HBSYH - Jul 17, 08:10 UTCJul 17, 08:35 UTC25m
2026-07-16 HBSYH - Jul 16, 14:15 UTCJul 16, 14:50 UTC35m
2026-07-16 HBSYH - Jul 16, 12:25 UTCJul 16, 13:05 UTC40m
2026-07-16 HBSYH - Jul 16, 10:04 UTCJul 16, 10:35 UTC30m
2026-07-16 HBSYH - Jul 16, 07:35 UTCJul 16, 08:10 UTC35m
2026-07-15 HBSYH - Jul 15, 12:20 UTCJul 15, 12:45 UTC25m
2026-07-15 HBSYH - Jul 15, 11:05 UTCJul 15, 11:30 UTC25m
2026-07-15 HBSYH - Jul 15, 09:00 UTCJul 15, 09:40 UTC40m
2026-07-14 HBSYH - Jul 14, 09:20 UTCJul 14, 09:55 UTC35m
2026-07-13 HBSYH - Jul 13, 14:05 UTCJul 13, 14:50 UTC45m
2026-07-13 HBSYH - Jul 13, 12:20 UTCJul 13, 12:45 UTC25m
2026-07-13 HBSYH - Jul 13, 07:50 UTCJul 13, 08:20 UTC30m
2026-07-10 HBSYH - Jul 10, 16:55 UTCJul 10, 17:10 UTC15m
2026-07-08 HBSYH - Jul 8, 14:45 UTCJul 8, 14:55 UTC10m
2026-07-08 HBSYH - Jul 8, 13:50 UTCJul 8, 14:10 UTC20m
2026-07-08 HBSYH - Jul 8, 11:50 UTCJul 8, 12:25 UTC35m
2026-06-17 HBSYH - Jun 17, 16:00 UTCJun 17, 16:40 UTC40m
2026-06-13 HBSYH - Jun 13, 09:15 UTCJun 13, 09:45 UTC30m
2026-06-12 HBSYH - Jun 12, 15:45 UTCJun 12, 16:10 UTC25m
2026-06-12 HBSYH - Jun 12, 13:05 UTCJun 12, 13:25 UTC20m
2026-06-12 HBSYH - Jun 12, 06:50 UTCJun 12, 07:25 UTC35m
2026-06-11 HBSYH - Jun 11, 12:45 UTCJun 11, 13:05 UTC20m
2026-06-11 HBSYH - Jun 11, 07:40 UTCJun 11, 08:00 UTC20m
2026-05-25 HBSYH - May 25, 11:00 UTCMay 25, 11:25 UTC25m
2026-05-25 HBSYH - May 25, 08:50 UTCMay 25, 09:10 UTC20m
2026-05-23 HBSYH - May 23, 17:45 UTCMay 23, 18:05 UTC20m
2026-05-23 HBSYH - May 23, 15:35 UTCMay 23, 16:00 UTC25m
2026-05-23 HBSYH - May 23, 12:55 UTCMay 23, 13:05 UTC10m
2026-05-21 HBSYH - May 21, 07:50 UTCMay 21, 08:10 UTC20m
2026-05-15 HBSYH - May 15, 13:30 UTCMay 15, 13:50 UTC20m
2026-05-13 HBSYH - May 13, 09:15 UTCMay 13, 10:00 UTC45m
2026-05-13 HBSYH - May 13, 06:55 UTCMay 13, 07:35 UTC40m
2026-05-11 HBSYH - May 11, 13:10 UTCMay 11, 13:40 UTC30m
2026-05-09 HBSYH - May 9, 09:50 UTCMay 9, 10:35 UTC45m
2026-05-08 HBSYH - May 8, 11:05 UTCMay 8, 11:30 UTC25m
2026-05-08 HBSYH - May 8, 09:25 UTCMay 8, 09:44 UTC20m
2026-05-08 HBSYH - May 8, 06:59 UTCMay 8, 07:29 UTC30m
2026-05-07 HBSYH - May 7, 13:15 UTCMay 7, 13:50 UTC35m
2026-05-07 HBSYH - May 7, 11:35 UTCMay 7, 12:05 UTC30m

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

Mode-S 4B31FF frequently asked

What is Mode-S code 4B31FF?
4B31FF is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-SYH.
Where is Mode-S 4B31FF registered?
Mode-S code 4B31FF is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B31FF broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B31FF, octal 22630777, decimal 4,927,999.
What flights does 4B31FF operate?
Mode-S 4B31FF has broadcast 1 distinct callsign, including HBSYH.