Apparatus

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sensors Mode-S transponder

4B1BC9

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-KNP · TECNAM P-2008

Hex
4B1BC9
Octal
22615711
Decimal
4,922,313
Country
CH
Tail
HB-KNP
Type
P208
No current signal · last broadcast 12h ago
Flights observed
240
Distinct callsigns
1
Country
CH
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S 4B1BC9.

Country allocation

The ICAO 24-bit address 4B1BC9 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
HBKNP - 240 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 HBKNP - Jul 13, 13:20 UTCJul 13, 14:00 UTC40m
2026-07-13 HBKNP - Jul 13, 11:30 UTCJul 13, 11:55 UTC25m
2026-07-13 HBKNP - Jul 13, 10:40 UTCJul 13, 10:50 UTC10m
2026-07-13 HBKNP - Jul 13, 07:25 UTCJul 13, 08:15 UTC50m
2026-07-12 HBKNP - Jul 12, 11:50 UTCJul 12, 14:55 UTC3h 5m
2026-07-12 HBKNP - Jul 12, 08:25 UTCJul 12, 11:15 UTC2h 50m
2026-07-12 HBKNP - Jul 12, 07:15 UTCJul 12, 07:55 UTC40m
2026-07-11 HBKNP - Jul 11, 13:35 UTCJul 11, 14:45 UTC1h 10m
2026-07-11 HBKNP - Jul 11, 10:15 UTCJul 11, 12:15 UTC2h 0m
2026-07-11 HBKNP - Jul 11, 08:30 UTCJul 11, 09:30 UTC1h 0m
2026-07-11 HBKNP - Jul 11, 07:30 UTCJul 11, 07:45 UTC15m
2026-07-10 HBKNP - Jul 10, 12:25 UTCJul 10, 12:45 UTC20m
2026-07-10 HBKNP - Jul 10, 07:40 UTCJul 10, 09:25 UTC1h 45m
2026-07-08 HBKNP - Jul 8, 13:45 UTCJul 8, 14:20 UTC35m
2026-07-08 HBKNP - Jul 8, 12:50 UTCJul 8, 13:20 UTC30m
2026-07-08 HBKNP - Jul 8, 08:20 UTCJul 8, 12:10 UTC3h 50m
2026-06-30 HBKNP - Jun 30, 11:20 UTCJun 30, 11:50 UTC30m
2026-06-30 HBKNP - Jun 30, 08:55 UTCJun 30, 09:35 UTC40m
2026-06-29 HBKNP - Jun 29, 12:34 UTCJun 29, 13:30 UTC55m
2026-06-29 HBKNP - Jun 29, 10:59 UTCJun 29, 11:39 UTC40m
2026-06-29 HBKNP - Jun 29, 09:25 UTCJun 29, 10:00 UTC35m
2026-06-29 HBKNP - Jun 29, 08:09 UTCJun 29, 08:24 UTC15m
2026-06-29 HBKNP - Jun 29, 07:09 UTCJun 29, 07:30 UTC20m
2026-06-28 HBKNP - Jun 28, 07:20 UTCJun 28, 11:14 UTC3h 55m
2026-06-27 HBKNP - Jun 27, 15:34 UTCJun 27, 16:14 UTC40m
2026-06-27 HBKNP - Jun 27, 15:00 UTCJun 27, 15:10 UTC10m
2026-06-27 HBKNP - Jun 27, 13:44 UTCJun 27, 14:29 UTC45m
2026-06-27 HBKNP - Jun 27, 12:29 UTCJun 27, 13:04 UTC35m
2026-06-27 HBKNP - Jun 27, 09:15 UTCJun 27, 10:00 UTC45m
2026-06-27 HBKNP - Jun 27, 07:55 UTCJun 27, 08:39 UTC45m
2026-06-26 HBKNP - Jun 26, 14:35 UTCJun 26, 14:44 UTC10m
2026-06-26 HBKNP - Jun 26, 09:24 UTCJun 26, 09:45 UTC20m
2026-06-25 HBKNP - Jun 25, 16:20 UTCJun 25, 16:55 UTC35m
2026-06-25 HBKNP - Jun 25, 15:24 UTCJun 25, 15:59 UTC35m
2026-06-25 HBKNP - Jun 25, 13:55 UTCJun 25, 14:34 UTC40m
2026-06-25 HBKNP - Jun 25, 11:54 UTCJun 25, 12:30 UTC35m
2026-06-25 HBKNP - Jun 25, 07:34 UTCJun 25, 08:24 UTC50m
2026-06-24 HBKNP - Jun 24, 15:59 UTCJun 24, 17:45 UTC1h 45m
2026-06-24 HBKNP - Jun 24, 13:50 UTCJun 24, 14:24 UTC35m
2026-06-24 HBKNP - Jun 24, 12:30 UTCJun 24, 13:20 UTC50m
2026-06-24 HBKNP - Jun 24, 09:05 UTCJun 24, 09:15 UTC10m
2026-06-24 HBKNP - Jun 24, 07:10 UTCJun 24, 07:50 UTC40m
2026-06-23 HBKNP - Jun 23, 15:15 UTCJun 23, 16:14 UTC1h 0m
2026-06-23 HBKNP - Jun 23, 13:09 UTCJun 23, 13:50 UTC40m
2026-06-23 HBKNP - Jun 23, 10:10 UTCJun 23, 10:19 UTC10m
2026-06-23 HBKNP - Jun 23, 08:45 UTCJun 23, 09:09 UTC25m
2026-06-23 HBKNP - Jun 23, 07:09 UTCJun 23, 07:35 UTC25m
2026-06-22 HBKNP - Jun 22, 16:50 UTCJun 22, 17:00 UTC10m
2026-06-22 HBKNP - Jun 22, 15:50 UTCJun 22, 16:14 UTC25m
2026-06-22 HBKNP - Jun 22, 14:19 UTCJun 22, 14:59 UTC40m

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

Mode-S 4B1BC9 frequently asked

What is Mode-S code 4B1BC9?
4B1BC9 is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-KNP.
Where is Mode-S 4B1BC9 registered?
Mode-S code 4B1BC9 is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B1BC9 broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B1BC9, octal 22615711, decimal 4,922,313.
What flights does 4B1BC9 operate?
Mode-S 4B1BC9 has broadcast 1 distinct callsign, including HBKNP.