Apparatus

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sensors Mode-S transponder

4B1BC5

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-KNL · TECNAM P-2008

Hex
4B1BC5
Octal
22615705
Decimal
4,922,309
Country
CH
Tail
HB-KNL
Type
P208
No current signal · last broadcast 8h ago
Flights observed
261
Distinct callsigns
1
Country
CH
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S 4B1BC5.

Country allocation

The ICAO 24-bit address 4B1BC5 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
HBKNL - 261 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 HBKNL - Jul 17, 17:15 UTCJul 17, 18:05 UTC50m
2026-07-17 HBKNL - Jul 17, 14:44 UTCJul 17, 15:44 UTC1h 0m
2026-07-17 HBKNL - Jul 17, 12:40 UTCJul 17, 13:00 UTC20m
2026-07-17 HBKNL - Jul 17, 10:50 UTCJul 17, 11:00 UTC10m
2026-07-17 HBKNL - Jul 17, 08:25 UTCJul 17, 09:50 UTC1h 25m
2026-07-17 HBKNL - Jul 17, 07:14 UTCJul 17, 07:44 UTC30m
2026-07-16 HBKNL - Jul 16, 14:15 UTCJul 16, 14:45 UTC30m
2026-07-16 HBKNL - Jul 16, 12:44 UTCJul 16, 12:55 UTC10m
2026-07-16 HBKNL - Jul 16, 08:30 UTCJul 16, 08:45 UTC15m
2026-07-16 HBKNL - Jul 16, 07:35 UTCJul 16, 08:10 UTC35m
2026-07-15 HBKNL - Jul 15, 08:55 UTCJul 15, 09:15 UTC20m
2026-07-15 HBKNL - Jul 15, 07:25 UTCJul 15, 07:50 UTC25m
2026-07-14 HBKNL - Jul 14, 17:00 UTCJul 14, 17:35 UTC35m
2026-07-14 HBKNL - Jul 14, 15:20 UTCJul 14, 15:55 UTC35m
2026-07-14 HBKNL - Jul 14, 13:55 UTCJul 14, 14:25 UTC30m
2026-07-14 HBKNL - Jul 14, 12:20 UTCJul 14, 13:05 UTC45m
2026-07-14 HBKNL - Jul 14, 09:50 UTCJul 14, 10:10 UTC20m
2026-07-12 HBKNL - Jul 12, 14:15 UTCJul 12, 17:35 UTC3h 20m
2026-07-12 HBKNL - Jul 12, 13:01 UTCJul 12, 13:50 UTC50m
2026-07-12 HBKNL - Jul 12, 11:45 UTCJul 12, 12:10 UTC25m
2026-07-12 HBKNL - Jul 12, 09:05 UTCJul 12, 10:20 UTC1h 15m
2026-07-11 HBKNL - Jul 11, 13:45 UTCJul 11, 14:35 UTC50m
2026-07-11 HBKNL - Jul 11, 09:45 UTCJul 11, 10:10 UTC25m
2026-07-10 HBKNL - Jul 10, 08:25 UTCJul 10, 08:55 UTC30m
2026-07-10 HBKNL - Jul 10, 07:00 UTCJul 10, 07:35 UTC35m
2026-07-09 HBKNL - Jul 9, 14:10 UTCJul 9, 14:30 UTC20m
2026-07-09 HBKNL - Jul 9, 13:00 UTCJul 9, 13:25 UTC25m
2026-07-09 HBKNL - Jul 9, 08:30 UTCJul 9, 09:00 UTC30m
2026-07-09 HBKNL - Jul 9, 07:00 UTCJul 9, 07:35 UTC35m
2026-07-08 HBKNL - Jul 8, 08:25 UTCJul 8, 09:20 UTC55m
2026-07-08 HBKNL - Jul 8, 06:50 UTCJul 8, 07:35 UTC45m
2026-07-07 HBKNL - Jul 7, 07:55 UTCJul 7, 09:55 UTC2h 0m
2026-07-06 HBKNL - Jul 6, 13:15 UTCJul 6, 14:00 UTC45m
2026-07-06 HBKNL - Jul 6, 11:50 UTCJul 6, 12:25 UTC35m
2026-07-05 HBKNL - Jul 5, 15:20 UTCJul 5, 15:40 UTC20m
2026-07-05 HBKNL - Jul 5, 12:30 UTCJul 5, 14:10 UTC1h 40m
2026-07-05 HBKNL - Jul 5, 11:30 UTCJul 5, 11:55 UTC25m
2026-07-05 HBKNL - Jul 5, 10:20 UTCJul 5, 10:50 UTC30m
2026-07-05 HBKNL - Jul 5, 06:35 UTCJul 5, 09:30 UTC2h 55m
2026-07-04 HBKNL - Jul 4, 16:35 UTCJul 4, 17:10 UTC35m
2026-07-04 HBKNL - Jul 4, 13:50 UTCJul 4, 15:40 UTC1h 50m
2026-07-04 HBKNL - Jul 4, 09:05 UTCJul 4, 09:45 UTC40m
2026-07-03 HBKNL - Jul 3, 16:35 UTCJul 3, 17:45 UTC1h 10m
2026-07-03 HBKNL - Jul 3, 15:05 UTCJul 3, 15:30 UTC25m
2026-07-03 HBKNL - Jul 3, 14:05 UTCJul 3, 14:30 UTC25m
2026-07-03 HBKNL - Jul 3, 07:15 UTCJul 3, 09:30 UTC2h 15m
2026-06-26 HBKNL - Jun 26, 15:05 UTCJun 26, 15:34 UTC30m
2026-06-25 HBKNL - Jun 25, 16:14 UTCJun 25, 16:45 UTC30m
2026-06-25 HBKNL - Jun 25, 15:20 UTCJun 25, 15:54 UTC35m
2026-06-25 HBKNL - Jun 25, 12:25 UTCJun 25, 14:29 UTC2h 5m

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

Mode-S 4B1BC5 frequently asked

What is Mode-S code 4B1BC5?
4B1BC5 is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-KNL.
Where is Mode-S 4B1BC5 registered?
Mode-S code 4B1BC5 is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B1BC5 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 4B1BC5, octal 22615705, decimal 4,922,309.
What flights does 4B1BC5 operate?
Mode-S 4B1BC5 has broadcast 1 distinct callsign, including HBKNL.