Apparatus

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sensors Mode-S transponder

4B1AF2

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-KFI · ROBIN DR-400

Hex
4B1AF2
Octal
22615362
Decimal
4,922,098
Country
CH
Tail
HB-KFI
Type
DR40
No current signal · last broadcast 1d ago
Flights observed
151
Distinct callsigns
1
Country
CH
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4B1AF2.

Country allocation

The ICAO 24-bit address 4B1AF2 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
HBKFI - 151 2026-06-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-01 HBKFI - Jun 1, 13:40 UTCJun 1, 14:05 UTC25m
2026-06-01 HBKFI - Jun 1, 09:45 UTCJun 1, 09:55 UTC10m
2026-05-31 HBKFI - May 31, 09:10 UTCMay 31, 09:45 UTC35m
2026-05-30 HBKFI - May 30, 13:40 UTCMay 30, 14:05 UTC25m
2026-05-30 HBKFI - May 30, 13:05 UTCMay 30, 13:25 UTC20m
2026-05-30 HBKFI - May 30, 12:30 UTCMay 30, 12:50 UTC20m
2026-05-30 HBKFI - May 30, 11:35 UTCMay 30, 11:55 UTC20m
2026-05-30 HBKFI - May 30, 10:55 UTCMay 30, 11:15 UTC20m
2026-05-30 HBKFI - May 30, 10:20 UTCMay 30, 10:40 UTC20m
2026-05-30 HBKFI - May 30, 09:40 UTCMay 30, 10:00 UTC20m
2026-05-30 HBKFI - May 30, 09:05 UTCMay 30, 09:25 UTC20m
2026-05-30 HBKFI - May 30, 08:15 UTCMay 30, 08:40 UTC25m
2026-05-29 HBKFI - May 29, 14:05 UTCMay 29, 14:40 UTC35m
2026-05-29 HBKFI - May 29, 09:50 UTCMay 29, 10:40 UTC50m
2026-05-29 HBKFI - May 29, 06:30 UTCMay 29, 08:10 UTC1h 40m
2026-05-28 HBKFI - May 28, 17:15 UTCMay 28, 17:50 UTC35m
2026-05-28 HBKFI - May 28, 16:05 UTCMay 28, 16:45 UTC40m
2026-05-28 HBKFI - May 28, 10:15 UTCMay 28, 11:00 UTC45m
2026-05-28 HBKFI - May 28, 09:20 UTCMay 28, 09:50 UTC30m
2026-05-28 HBKFI - May 28, 08:05 UTCMay 28, 08:20 UTC15m
2026-05-28 HBKFI - May 28, 07:50 UTCMay 28, 07:55 UTC5m
2026-05-28 HBKFI - May 28, 07:30 UTCMay 28, 07:40 UTC10m
2026-05-27 HBKFI - May 27, 14:50 UTCMay 27, 15:10 UTC20m
2026-05-26 HBKFI - May 26, 15:00 UTCMay 26, 15:09 UTC10m
2026-05-26 HBKFI - May 26, 13:29 UTCMay 26, 14:05 UTC35m
2026-05-26 HBKFI - May 26, 12:20 UTCMay 26, 12:50 UTC30m
2026-05-26 HBKFI - May 26, 08:50 UTCMay 26, 09:19 UTC30m
2026-05-26 HBKFI - May 26, 07:15 UTCMay 26, 08:04 UTC50m
2026-05-25 HBKFI - May 25, 14:50 UTCMay 25, 15:20 UTC30m
2026-05-25 HBKFI - May 25, 13:10 UTCMay 25, 13:30 UTC20m
2026-05-25 HBKFI - May 25, 12:05 UTCMay 25, 12:35 UTC30m
2026-05-25 HBKFI - May 25, 10:40 UTCMay 25, 10:55 UTC15m
2026-05-25 HBKFI - May 25, 07:50 UTCMay 25, 09:20 UTC1h 30m
2026-05-24 HBKFI - May 24, 16:05 UTCMay 24, 16:25 UTC20m
2026-05-24 HBKFI - May 24, 13:45 UTCMay 24, 14:15 UTC30m
2026-05-24 HBKFI - May 24, 11:30 UTCMay 24, 12:20 UTC50m
2026-05-24 HBKFI - May 24, 09:20 UTCMay 24, 09:45 UTC25m
2026-05-24 HBKFI - May 24, 08:30 UTCMay 24, 08:45 UTC15m
2026-05-24 HBKFI - May 24, 06:30 UTCMay 24, 07:45 UTC1h 15m
2026-05-23 HBKFI - May 23, 16:15 UTCMay 23, 17:00 UTC45m
2026-05-23 HBKFI - May 23, 15:05 UTCMay 23, 15:15 UTC10m
2026-05-23 HBKFI - May 23, 14:30 UTCMay 23, 15:00 UTC30m
2026-05-23 HBKFI - May 23, 11:20 UTCMay 23, 11:40 UTC20m
2026-05-23 HBKFI - May 23, 08:45 UTCMay 23, 09:40 UTC55m
2026-05-22 HBKFI - May 22, 16:20 UTCMay 22, 17:00 UTC40m
2026-05-22 HBKFI - May 22, 14:35 UTCMay 22, 15:20 UTC45m
2026-05-22 HBKFI - May 22, 11:35 UTCMay 22, 11:50 UTC15m
2026-05-22 HBKFI - May 22, 09:30 UTCMay 22, 09:35 UTC5m
2026-05-22 HBKFI - May 22, 09:15 UTCMay 22, 09:20 UTC5m
2026-05-21 HBKFI - May 21, 16:10 UTCMay 21, 17:00 UTC50m

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

Mode-S 4B1AF2 frequently asked

What is Mode-S code 4B1AF2?
4B1AF2 is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-KFI.
Where is Mode-S 4B1AF2 registered?
Mode-S code 4B1AF2 is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B1AF2 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B1AF2, octal 22615362, decimal 4,922,098.
What flights does 4B1AF2 operate?
Mode-S 4B1AF2 has broadcast 1 distinct callsign, including HBKFI.