Apparatus

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sensors Mode-S transponder

4B1B2F

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-KHR · CIRRUS SR-22

Hex
4B1B2F
Octal
22615457
Decimal
4,922,159
Country
CH
Tail
HB-KHR
Type
SR22
No current signal · last broadcast 8h ago
Flights observed
53
Distinct callsigns
1
Country
CH
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S 4B1B2F.

Country allocation

The ICAO 24-bit address 4B1B2F 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
HBKHR - 53 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 HBKHR FDH → ZRH Jun 2, 10:10 UTCJun 2, 10:40 UTC30m
2026-06-02 HBKHR ZRH → FDH Jun 2, 06:45 UTCJun 2, 07:45 UTC1h 0m
2026-06-01 HBKHR - Jun 1, 14:05 UTCJun 1, 14:40 UTC35m
2026-06-01 HBKHR - Jun 1, 12:55 UTCJun 1, 13:30 UTC35m
2026-05-28 HBKHR - May 28, 14:55 UTCMay 28, 15:25 UTC30m
2026-05-28 HBKHR - May 28, 14:25 UTCMay 28, 14:35 UTC10m
2026-05-28 HBKHR - May 28, 13:00 UTCMay 28, 13:20 UTC20m
2026-05-28 HBKHR - May 28, 12:00 UTCMay 28, 12:40 UTC40m
2026-05-28 HBKHR - May 28, 09:05 UTCMay 28, 10:05 UTC1h 0m
2026-05-26 HBKHR - May 26, 12:10 UTCMay 26, 12:50 UTC40m
2026-05-26 HBKHR - May 26, 08:45 UTCMay 26, 09:55 UTC1h 10m
2026-05-25 HBKHR - May 25, 12:40 UTCMay 25, 14:55 UTC2h 15m
2026-05-23 HBKHR - May 23, 08:55 UTCMay 23, 10:50 UTC1h 55m
2026-05-22 HBKHR - May 22, 15:35 UTCMay 22, 16:35 UTC1h 0m
2026-05-22 HBKHR - May 22, 10:40 UTCMay 22, 14:10 UTC3h 30m
2026-05-18 HBKHR ZRH → IBZ May 18, 08:55 UTCMay 18, 13:45 UTC4h 50m
2026-05-17 HBKHR - May 17, 14:10 UTCMay 17, 16:25 UTC2h 15m
2026-05-17 HBKHR - May 17, 07:40 UTCMay 17, 09:10 UTC1h 30m
2026-05-16 HBKHR - May 16, 08:26 UTCMay 16, 09:51 UTC1h 25m
2026-05-15 HBKHR - May 15, 15:00 UTCMay 15, 15:45 UTC45m
2026-05-14 HBKHR - May 14, 12:35 UTCMay 14, 14:30 UTC1h 55m
2026-05-13 HBKHR FDH → ZRH May 13, 12:45 UTCMay 13, 13:15 UTC30m
2026-05-13 HBKHR - May 13, 11:20 UTCMay 13, 11:40 UTC20m
2026-05-13 HBKHR - May 13, 09:35 UTCMay 13, 10:35 UTC1h 0m
2026-05-10 HBKHR ACH → ZRH May 10, 09:50 UTCMay 10, 10:24 UTC35m
2026-05-10 HBKHR - May 10, 08:00 UTCMay 10, 09:10 UTC1h 10m
2026-05-08 HBKHR - May 8, 12:10 UTCMay 8, 13:40 UTC1h 30m
2026-05-08 HBKHR ZRH → ACH May 8, 09:34 UTCMay 8, 09:54 UTC20m
2026-05-07 HBKHR - May 7, 15:50 UTCMay 7, 16:25 UTC35m
2026-05-07 HBKHR ZRH → BRN May 7, 14:00 UTCMay 7, 15:15 UTC1h 15m
2026-05-04 HBKHR - May 4, 10:50 UTCMay 4, 11:50 UTC1h 0m
2026-05-04 HBKHR ZRH → GVA May 4, 06:35 UTCMay 4, 07:35 UTC1h 0m
2026-05-01 HBKHR - May 1, 15:05 UTCMay 1, 15:40 UTC35m
2026-05-01 HBKHR - May 1, 09:40 UTCMay 1, 10:10 UTC30m
2026-04-26 HBKHR RTM → ZRH Apr 26, 10:50 UTCApr 26, 13:00 UTC2h 10m
2026-04-26 HBKHR - Apr 26, 08:20 UTCApr 26, 09:40 UTC1h 20m
2026-04-25 HBKHR - Apr 25, 13:00 UTCApr 25, 15:10 UTC2h 10m
2026-04-25 HBKHR - Apr 25, 09:40 UTCApr 25, 11:05 UTC1h 25m
2026-04-23 HBKHR - Apr 23, 13:30 UTCApr 23, 15:55 UTC2h 25m
2026-04-23 HBKHR - Apr 23, 09:45 UTCApr 23, 11:15 UTC1h 30m
2026-04-22 HBKHR - Apr 22, 10:25 UTCApr 22, 11:45 UTC1h 20m
2026-04-22 HBKHR - Apr 22, 07:05 UTCApr 22, 08:10 UTC1h 5m
2026-04-18 HBKHR - Apr 18, 14:10 UTCApr 18, 15:05 UTC55m
2026-04-18 HBKHR - Apr 18, 12:00 UTCApr 18, 12:15 UTC15m
2026-04-18 HBKHR - Apr 18, 08:55 UTCApr 18, 09:40 UTC45m
2026-04-17 HBKHR - Apr 17, 12:35 UTCApr 17, 13:10 UTC35m
2026-04-17 HBKHR - Apr 17, 09:20 UTCApr 17, 09:45 UTC25m
2026-04-17 HBKHR - Apr 17, 08:45 UTCApr 17, 09:15 UTC30m
2026-04-15 HBKHR - Apr 15, 13:01 UTCApr 15, 13:15 UTC15m
2026-04-15 HBKHR - Apr 15, 11:00 UTCApr 15, 11:35 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-KHR page for operator, model, and routing details .

Mode-S 4B1B2F frequently asked

What is Mode-S code 4B1B2F?
4B1B2F is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-KHR.
Where is Mode-S 4B1B2F registered?
Mode-S code 4B1B2F is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B1B2F broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B1B2F, octal 22615457, decimal 4,922,159.
What flights does 4B1B2F operate?
Mode-S 4B1B2F has broadcast 1 distinct callsign, including HBKHR.