Apparatus

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sensors Mode-S transponder

4B1C99

ICAO 24-bit transponder address · allocated to Switzerland

Hex
4B1C99
Octal
22616231
Decimal
4,922,521
Country
CH
No current signal · last broadcast Jul 25, 10:10 UTC
Flights observed
157
Distinct callsigns
1
Country
CH
Last broadcast
Jul 25, 10:10 UTC

Last known position

Most recent position reported by Mode-S 4B1C99.

Country allocation

The ICAO 24-bit address 4B1C99 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
HBKVP - 157 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 HBKVP - Jul 25, 09:40 UTCJul 25, 10:10 UTC30m
2026-07-25 HBKVP - Jul 25, 06:55 UTCJul 25, 07:20 UTC25m
2026-07-24 HBKVP - Jul 24, 13:25 UTCJul 24, 13:40 UTC15m
2026-07-24 HBKVP - Jul 24, 12:10 UTCJul 24, 13:10 UTC1h 0m
2026-07-24 HBKVP - Jul 24, 08:20 UTCJul 24, 09:15 UTC55m
2026-07-24 HBKVP - Jul 24, 06:20 UTCJul 24, 07:05 UTC45m
2026-07-21 HBKVP - Jul 21, 08:40 UTCJul 21, 09:30 UTC50m
2026-07-20 HBKVP - Jul 20, 12:20 UTCJul 20, 12:40 UTC20m
2026-07-20 HBKVP - Jul 20, 11:40 UTCJul 20, 12:15 UTC35m
2026-07-20 HBKVP - Jul 20, 10:40 UTCJul 20, 10:55 UTC15m
2026-07-17 HBKVP - Jul 17, 13:55 UTCJul 17, 15:15 UTC1h 20m
2026-07-17 HBKVP - Jul 17, 06:45 UTCJul 17, 07:44 UTC1h 0m
2026-07-16 HBKVP - Jul 16, 12:55 UTCJul 16, 13:45 UTC50m
2026-07-16 HBKVP - Jul 16, 11:45 UTCJul 16, 12:20 UTC35m
2026-07-16 HBKVP - Jul 16, 11:30 UTCJul 16, 11:40 UTC10m
2026-07-11 HBKVP - Jul 11, 09:00 UTCJul 11, 09:30 UTC30m
2026-07-11 HBKVP - Jul 11, 08:25 UTCJul 11, 08:40 UTC15m
2026-07-10 HBKVP - Jul 10, 14:10 UTCJul 10, 14:30 UTC20m
2026-07-10 HBKVP - Jul 10, 13:30 UTCJul 10, 14:05 UTC35m
2026-07-10 HBKVP - Jul 10, 11:40 UTCJul 10, 12:40 UTC1h 0m
2026-07-10 HBKVP - Jul 10, 10:15 UTCJul 10, 10:55 UTC40m
2026-07-09 HBKVP - Jul 9, 15:15 UTCJul 9, 16:25 UTC1h 10m
2026-07-09 HBKVP - Jul 9, 13:50 UTCJul 9, 14:15 UTC25m
2026-07-09 HBKVP - Jul 9, 12:10 UTCJul 9, 12:55 UTC45m
2026-07-09 HBKVP - Jul 9, 11:45 UTCJul 9, 11:55 UTC10m
2026-07-09 HBKVP - Jul 9, 09:30 UTCJul 9, 10:25 UTC55m
2026-07-09 HBKVP - Jul 9, 07:25 UTCJul 9, 08:25 UTC1h 0m
2026-07-08 HBKVP - Jul 8, 14:30 UTCJul 8, 14:45 UTC15m
2026-07-08 HBKVP - Jul 8, 13:45 UTCJul 8, 14:15 UTC30m
2026-07-08 HBKVP - Jul 8, 12:05 UTCJul 8, 12:55 UTC50m
2026-07-08 HBKVP - Jul 8, 09:30 UTCJul 8, 10:10 UTC40m
2026-07-08 HBKVP - Jul 8, 07:55 UTCJul 8, 08:40 UTC45m
2026-07-04 HBKVP - Jul 4, 15:25 UTCJul 4, 15:50 UTC25m
2026-07-04 HBKVP - Jul 4, 07:10 UTCJul 4, 08:00 UTC50m
2026-07-03 HBKVP - Jul 3, 06:05 UTCJul 3, 06:25 UTC20m
2026-06-18 HBKVP - Jun 18, 12:05 UTCJun 18, 12:55 UTC50m
2026-06-16 HBKVP - Jun 16, 17:30 UTCJun 16, 17:55 UTC25m
2026-06-15 HBKVP - Jun 15, 15:35 UTCJun 15, 15:59 UTC25m
2026-06-15 HBKVP - Jun 15, 12:35 UTCJun 15, 13:00 UTC25m
2026-06-14 HBKVP - Jun 14, 08:50 UTCJun 14, 10:00 UTC1h 10m
2026-06-13 HBKVP - Jun 13, 13:45 UTCJun 13, 14:40 UTC55m
2026-06-13 HBKVP - Jun 13, 11:55 UTCJun 13, 12:35 UTC40m
2026-06-12 HBKVP - Jun 12, 10:50 UTCJun 12, 11:45 UTC55m
2026-06-12 HBKVP - Jun 12, 08:45 UTCJun 12, 09:15 UTC30m
2026-06-12 HBKVP - Jun 12, 07:45 UTCJun 12, 08:15 UTC30m
2026-06-12 HBKVP - Jun 12, 07:15 UTCJun 12, 07:30 UTC15m
2026-06-12 HBKVP - Jun 12, 06:55 UTCJun 12, 07:10 UTC15m
2026-06-10 HBKVP - Jun 10, 09:45 UTCJun 10, 10:10 UTC25m
2026-06-10 HBKVP - Jun 10, 08:20 UTCJun 10, 09:05 UTC45m
2026-06-09 HBKVP - Jun 9, 10:35 UTCJun 9, 10:55 UTC20m

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.

Mode-S 4B1C99 frequently asked

What is Mode-S code 4B1C99?
4B1C99 is an ICAO 24-bit transponder address. Allocated to Switzerland.
Where is Mode-S 4B1C99 registered?
Mode-S code 4B1C99 is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B1C99 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 10:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B1C99, octal 22616231, decimal 4,922,521.
What flights does 4B1C99 operate?
Mode-S 4B1C99 has broadcast 1 distinct callsign, including HBKVP.