Apparatus

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sensors Mode-S transponder

4B3F31

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-XYF · ROBINSON R-44 Raven

Hex
4B3F31
Octal
22637461
Decimal
4,931,377
Country
CH
Tail
HB-XYF
Type
R44
No current signal · last broadcast 18h ago
Flights observed
75
Distinct callsigns
1
Country
CH
Last broadcast
18h ago

Last known position

Most recent position reported by Mode-S 4B3F31.

Country allocation

The ICAO 24-bit address 4B3F31 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
HBXYF - 75 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 HBXYF - Jul 17, 06:54 UTCJul 17, 07:50 UTC55m
2026-07-17 HBXYF - Jul 17, 06:35 UTCJul 17, 06:45 UTC10m
2026-07-14 HBXYF - Jul 14, 07:35 UTCJul 14, 08:30 UTC55m
2026-07-13 HBXYF - Jul 13, 16:35 UTCJul 13, 17:40 UTC1h 5m
2026-07-10 HBXYF - Jul 10, 09:15 UTCJul 10, 09:20 UTC5m
2026-07-10 HBXYF - Jul 10, 09:00 UTCJul 10, 09:10 UTC10m
2026-07-10 HBXYF - Jul 10, 08:40 UTCJul 10, 08:55 UTC15m
2026-07-09 HBXYF - Jul 9, 12:20 UTCJul 9, 12:35 UTC15m
2026-07-09 HBXYF - Jul 9, 12:05 UTCJul 9, 12:15 UTC10m
2026-07-09 HBXYF - Jul 9, 11:45 UTCJul 9, 11:55 UTC10m
2026-07-07 HBXYF - Jul 7, 14:40 UTCJul 7, 15:00 UTC20m
2026-07-07 HBXYF - Jul 7, 13:10 UTCJul 7, 13:35 UTC25m
2026-07-07 HBXYF - Jul 7, 11:35 UTCJul 7, 12:05 UTC30m
2026-07-07 HBXYF - Jul 7, 09:40 UTCJul 7, 10:05 UTC25m
2026-07-07 HBXYF - Jul 7, 08:25 UTCJul 7, 08:35 UTC10m
2026-07-07 HBXYF - Jul 7, 07:15 UTCJul 7, 08:20 UTC1h 5m
2026-07-06 HBXYF - Jul 6, 07:00 UTCJul 6, 07:40 UTC40m
2026-07-06 HBXYF - Jul 6, 06:25 UTCJul 6, 06:50 UTC25m
2026-07-03 HBXYF - Jul 3, 15:50 UTCJul 3, 16:00 UTC10m
2026-07-03 HBXYF - Jul 3, 15:20 UTCJul 3, 15:30 UTC10m
2026-07-03 HBXYF - Jul 3, 12:40 UTCJul 3, 13:40 UTC1h 0m
2026-07-03 HBXYF - Jul 3, 12:00 UTCJul 3, 12:15 UTC15m
2026-07-02 HBXYF - Jul 2, 16:25 UTCJul 2, 16:35 UTC10m
2026-07-02 HBXYF - Jul 2, 15:55 UTCJul 2, 16:15 UTC20m
2026-07-02 HBXYF - Jul 2, 14:05 UTCJul 2, 14:10 UTC5m
2026-07-02 HBXYF - Jul 2, 12:35 UTCJul 2, 13:55 UTC1h 20m
2026-06-20 HBXYF - Jun 20, 11:40 UTCJun 20, 12:09 UTC30m
2026-06-20 HBXYF - Jun 20, 05:59 UTCJun 20, 07:19 UTC1h 20m
2026-06-19 HBXYF - Jun 19, 11:14 UTCJun 19, 12:09 UTC55m
2026-06-19 HBXYF - Jun 19, 09:30 UTCJun 19, 09:55 UTC25m
2026-06-19 HBXYF - Jun 19, 09:14 UTCJun 19, 09:24 UTC10m
2026-06-19 HBXYF - Jun 19, 08:59 UTCJun 19, 09:09 UTC10m
2026-06-19 HBXYF - Jun 19, 07:04 UTCJun 19, 08:04 UTC1h 0m
2026-06-18 HBXYF - Jun 18, 17:25 UTCJun 18, 17:35 UTC10m
2026-06-18 HBXYF - Jun 18, 16:55 UTCJun 18, 17:15 UTC20m
2026-06-18 HBXYF - Jun 18, 16:35 UTCJun 18, 16:50 UTC15m
2026-06-18 HBXYF - Jun 18, 16:15 UTCJun 18, 16:20 UTC5m
2026-06-17 HBXYF - Jun 17, 08:30 UTCJun 17, 08:50 UTC20m
2026-06-17 HBXYF - Jun 17, 07:55 UTCJun 17, 08:25 UTC30m
2026-06-17 HBXYF - Jun 17, 07:10 UTCJun 17, 07:50 UTC40m
2026-06-16 HBXYF - Jun 16, 13:15 UTCJun 16, 13:55 UTC40m
2026-06-11 HBXYF - Jun 11, 17:25 UTCJun 11, 17:45 UTC20m
2026-06-11 HBXYF - Jun 11, 16:55 UTCJun 11, 17:20 UTC25m
2026-06-11 HBXYF - Jun 11, 11:25 UTCJun 11, 11:35 UTC10m
2026-06-11 HBXYF - Jun 11, 09:35 UTCJun 11, 09:45 UTC10m
2026-06-08 HBXYF - Jun 8, 12:25 UTCJun 8, 12:40 UTC15m
2026-06-08 HBXYF - Jun 8, 11:50 UTCJun 8, 12:20 UTC30m
2026-06-08 HBXYF - Jun 8, 11:35 UTCJun 8, 11:45 UTC10m
2026-05-30 HBXYF - May 30, 09:30 UTCMay 30, 09:35 UTC5m
2026-05-30 HBXYF - May 30, 08:55 UTCMay 30, 09:20 UTC25m

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

Mode-S 4B3F31 frequently asked

What is Mode-S code 4B3F31?
4B3F31 is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-XYF.
Where is Mode-S 4B3F31 registered?
Mode-S code 4B3F31 is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B3F31 broadcasting right now?
No active broadcast right now. Last signal was 18h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B3F31, octal 22637461, decimal 4,931,377.
What flights does 4B3F31 operate?
Mode-S 4B3F31 has broadcast 1 distinct callsign, including HBXYF.