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 5d ago
Flights observed
218
Distinct callsigns
1
Country
CH
Last broadcast
5d 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 - 218 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 HBKFI - Jul 12, 14:40 UTCJul 12, 14:55 UTC15m
2026-06-23 HBKFI - Jun 23, 06:34 UTCJun 23, 07:35 UTC1h 0m
2026-06-22 HBKFI - Jun 22, 16:20 UTCJun 22, 16:40 UTC20m
2026-06-22 HBKFI - Jun 22, 10:19 UTCJun 22, 10:49 UTC30m
2026-06-22 HBKFI - Jun 22, 09:00 UTCJun 22, 09:10 UTC10m
2026-06-22 HBKFI - Jun 22, 08:35 UTCJun 22, 08:54 UTC20m
2026-06-22 HBKFI - Jun 22, 07:30 UTCJun 22, 07:49 UTC20m
2026-06-22 HBKFI - Jun 22, 07:04 UTCJun 22, 07:25 UTC20m
2026-06-21 HBKFI - Jun 21, 14:10 UTCJun 21, 14:50 UTC40m
2026-06-21 HBKFI - Jun 21, 12:49 UTCJun 21, 13:24 UTC35m
2026-06-21 HBKFI - Jun 21, 11:20 UTCJun 21, 12:04 UTC45m
2026-06-21 HBKFI - Jun 21, 09:55 UTCJun 21, 10:14 UTC20m
2026-06-21 HBKFI - Jun 21, 08:49 UTCJun 21, 09:20 UTC30m
2026-06-20 HBKFI - Jun 20, 11:59 UTCJun 20, 12:39 UTC40m
2026-06-20 HBKFI - Jun 20, 08:39 UTCJun 20, 09:29 UTC50m
2026-06-20 HBKFI - Jun 20, 06:45 UTCJun 20, 07:34 UTC50m
2026-06-19 HBKFI - Jun 19, 15:14 UTCJun 19, 15:39 UTC25m
2026-06-19 HBKFI - Jun 19, 13:50 UTCJun 19, 14:19 UTC30m
2026-06-19 HBKFI - Jun 19, 13:34 UTCJun 19, 13:44 UTC10m
2026-06-19 HBKFI - Jun 19, 13:14 UTCJun 19, 13:29 UTC15m
2026-06-19 HBKFI - Jun 19, 11:14 UTCJun 19, 11:54 UTC40m
2026-06-19 HBKFI - Jun 19, 08:44 UTCJun 19, 09:34 UTC50m
2026-06-19 HBKFI - Jun 19, 06:54 UTCJun 19, 07:34 UTC40m
2026-06-18 HBKFI - Jun 18, 13:30 UTCJun 18, 14:35 UTC1h 5m
2026-06-18 HBKFI - Jun 18, 10:50 UTCJun 18, 11:45 UTC55m
2026-06-18 HBKFI - Jun 18, 08:15 UTCJun 18, 09:15 UTC1h 0m
2026-06-18 HBKFI - Jun 18, 07:25 UTCJun 18, 07:30 UTC5m
2026-06-14 HBKFI - Jun 14, 15:00 UTCJun 14, 15:25 UTC25m
2026-06-14 HBKFI - Jun 14, 13:15 UTCJun 14, 13:40 UTC25m
2026-06-14 HBKFI - Jun 14, 11:45 UTCJun 14, 12:00 UTC15m
2026-06-14 HBKFI - Jun 14, 09:25 UTCJun 14, 09:45 UTC20m
2026-06-14 HBKFI - Jun 14, 07:00 UTCJun 14, 08:10 UTC1h 10m
2026-06-13 HBKFI - Jun 13, 12:10 UTCJun 13, 13:10 UTC1h 0m
2026-06-12 HBKFI - Jun 12, 16:25 UTCJun 12, 16:45 UTC20m
2026-06-12 HBKFI - Jun 12, 16:10 UTCJun 12, 16:20 UTC10m
2026-06-12 HBKFI - Jun 12, 15:30 UTCJun 12, 15:45 UTC15m
2026-06-12 HBKFI - Jun 12, 13:25 UTCJun 12, 13:50 UTC25m
2026-06-12 HBKFI - Jun 12, 11:55 UTCJun 12, 12:15 UTC20m
2026-06-11 HBKFI - Jun 11, 10:05 UTCJun 11, 10:50 UTC45m
2026-06-11 HBKFI - Jun 11, 08:50 UTCJun 11, 09:15 UTC25m
2026-06-11 HBKFI - Jun 11, 07:55 UTCJun 11, 08:10 UTC15m
2026-06-11 HBKFI - Jun 11, 07:40 UTCJun 11, 07:50 UTC10m
2026-06-10 HBKFI - Jun 10, 16:25 UTCJun 10, 17:20 UTC55m
2026-06-09 HBKFI - Jun 9, 17:05 UTCJun 9, 17:30 UTC25m
2026-06-09 HBKFI - Jun 9, 13:45 UTCJun 9, 14:50 UTC1h 5m
2026-06-09 HBKFI - Jun 9, 06:35 UTCJun 9, 07:15 UTC40m
2026-06-08 HBKFI - Jun 8, 08:40 UTCJun 8, 08:55 UTC15m
2026-06-08 HBKFI - Jun 8, 07:15 UTCJun 8, 07:30 UTC15m
2026-06-08 HBKFI - Jun 8, 06:30 UTCJun 8, 07:10 UTC40m
2026-06-07 HBKFI - Jun 7, 16:40 UTCJun 7, 17:15 UTC35m

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 5d 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.