Apparatus

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sensors Mode-S transponder

4B1BFB

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-KPN · SOCATA TB-20 Trinidad

Hex
4B1BFB
Octal
22615773
Decimal
4,922,363
Country
CH
Tail
HB-KPN
Type
TB20
No current signal · last broadcast 16h ago
Flights observed
99
Distinct callsigns
1
Country
CH
Last broadcast
16h ago

Last known position

Most recent position reported by Mode-S 4B1BFB.

Country allocation

The ICAO 24-bit address 4B1BFB 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
HBKPN - 99 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 HBKPN - Jul 17, 09:45 UTCJul 17, 10:00 UTC15m
2026-07-14 HBKPN - Jul 14, 08:20 UTCJul 14, 08:35 UTC15m
2026-07-13 HBKPN - Jul 13, 12:40 UTCJul 13, 13:25 UTC45m
2026-07-13 HBKPN - Jul 13, 08:30 UTCJul 13, 09:10 UTC40m
2026-07-12 HBKPN - Jul 12, 16:25 UTCJul 12, 17:45 UTC1h 20m
2026-07-12 HBKPN - Jul 12, 14:15 UTCJul 12, 15:40 UTC1h 25m
2026-07-11 HBKPN - Jul 11, 09:50 UTCJul 11, 11:15 UTC1h 25m
2026-07-11 HBKPN - Jul 11, 07:30 UTCJul 11, 08:40 UTC1h 10m
2026-07-10 HBKPN - Jul 10, 07:15 UTCJul 10, 09:00 UTC1h 45m
2026-07-09 HBKPN - Jul 9, 17:45 UTCJul 9, 18:30 UTC45m
2026-07-06 HBKPN - Jul 6, 17:20 UTCJul 6, 17:30 UTC10m
2026-07-06 HBKPN - Jul 6, 09:10 UTCJul 6, 09:35 UTC25m
2026-07-05 HBKPN - Jul 5, 15:00 UTCJul 5, 15:45 UTC45m
2026-07-05 HBKPN - Jul 5, 14:10 UTCJul 5, 14:25 UTC15m
2026-07-05 HBKPN - Jul 5, 12:40 UTCJul 5, 13:25 UTC45m
2026-07-04 HBKPN - Jul 4, 14:30 UTCJul 4, 15:00 UTC30m
2026-06-28 HBKPN - Jun 28, 09:30 UTCJun 28, 10:15 UTC45m
2026-06-27 HBKPN - Jun 27, 06:09 UTCJun 27, 07:19 UTC1h 10m
2026-06-22 HBKPN - Jun 22, 08:25 UTCJun 22, 08:40 UTC15m
2026-06-22 HBKPN - Jun 22, 07:19 UTCJun 22, 07:54 UTC35m
2026-06-21 HBKPN - Jun 21, 16:59 UTCJun 21, 17:39 UTC40m
2026-06-21 HBKPN - Jun 21, 09:29 UTCJun 21, 09:44 UTC15m
2026-06-20 HBKPN - Jun 20, 09:34 UTCJun 20, 09:49 UTC15m
2026-06-19 HBKPN - Jun 19, 12:54 UTCJun 19, 13:09 UTC15m
2026-06-19 HBKPN - Jun 19, 11:24 UTCJun 19, 12:25 UTC1h 0m
2026-06-19 HBKPN - Jun 19, 07:09 UTCJun 19, 08:50 UTC1h 40m
2026-06-17 HBKPN - Jun 17, 14:15 UTCJun 17, 14:45 UTC30m
2026-06-17 HBKPN - Jun 17, 13:10 UTCJun 17, 13:25 UTC15m
2026-06-17 HBKPN - Jun 17, 06:10 UTCJun 17, 06:55 UTC45m
2026-06-15 HBKPN - Jun 15, 16:04 UTCJun 15, 16:30 UTC25m
2026-06-14 HBKPN - Jun 14, 12:05 UTCJun 14, 12:35 UTC30m
2026-06-14 HBKPN - Jun 14, 09:45 UTCJun 14, 10:15 UTC30m
2026-06-13 HBKPN - Jun 13, 14:15 UTCJun 13, 16:15 UTC2h 0m
2026-06-13 HBKPN - Jun 13, 07:10 UTCJun 13, 09:00 UTC1h 50m
2026-06-06 HBKPN - Jun 6, 09:15 UTCJun 6, 09:39 UTC25m
2026-06-06 HBKPN - Jun 6, 08:10 UTCJun 6, 08:35 UTC25m
2026-06-05 HBKPN - Jun 5, 15:35 UTCJun 5, 15:55 UTC20m
2026-06-05 HBKPN - Jun 5, 14:30 UTCJun 5, 15:00 UTC30m
2026-06-05 HBKPN - Jun 5, 12:50 UTCJun 5, 13:45 UTC55m
2026-06-03 HBKPN - Jun 3, 09:40 UTCJun 3, 10:15 UTC35m
2026-06-03 HBKPN - Jun 3, 07:15 UTCJun 3, 08:40 UTC1h 25m
2026-06-01 HBKPN - Jun 1, 07:35 UTCJun 1, 08:10 UTC35m
2026-06-01 HBKPN - Jun 1, 06:00 UTCJun 1, 06:55 UTC55m
2026-05-30 HBKPN - May 30, 07:25 UTCMay 30, 08:40 UTC1h 15m
2026-05-29 HBKPN - May 29, 18:20 UTCMay 29, 18:30 UTC10m
2026-05-29 HBKPN - May 29, 16:05 UTCMay 29, 16:35 UTC30m
2026-05-29 HBKPN - May 29, 13:50 UTCMay 29, 14:15 UTC25m
2026-05-29 HBKPN - May 29, 09:50 UTCMay 29, 10:05 UTC15m
2026-05-29 HBKPN - May 29, 07:35 UTCMay 29, 07:45 UTC10m
2026-05-28 HBKPN - May 28, 10:05 UTCMay 28, 10:15 UTC10m

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

Mode-S 4B1BFB frequently asked

What is Mode-S code 4B1BFB?
4B1BFB is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-KPN.
Where is Mode-S 4B1BFB registered?
Mode-S code 4B1BFB is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B1BFB broadcasting right now?
No active broadcast right now. Last signal was 16h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B1BFB, octal 22615773, decimal 4,922,363.
What flights does 4B1BFB operate?
Mode-S 4B1BFB has broadcast 1 distinct callsign, including HBKPN.