Apparatus

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sensors Mode-S transponder

4B1B4A

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-KIS · BRM AERO Bristell B23

Hex
4B1B4A
Octal
22615512
Decimal
4,922,186
Country
CH
Tail
HB-KIS
Type
BR23
No current signal · last broadcast 6d ago
Flights observed
143
Distinct callsigns
1
Country
CH
Last broadcast
6d ago

Last known position

Most recent position reported by Mode-S 4B1B4A.

Country allocation

The ICAO 24-bit address 4B1B4A 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
HBKIS - 143 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-08 HBKIS - Jul 8, 17:35 UTCJul 8, 18:25 UTC50m
2026-07-07 HBKIS - Jul 7, 11:20 UTCJul 7, 12:15 UTC55m
2026-07-07 HBKIS - Jul 7, 08:40 UTCJul 7, 09:10 UTC30m
2026-07-07 HBKIS - Jul 7, 07:25 UTCJul 7, 08:00 UTC35m
2026-07-02 HBKIS - Jul 2, 17:40 UTCJul 2, 18:05 UTC25m
2026-07-02 HBKIS - Jul 2, 15:55 UTCJul 2, 16:20 UTC25m
2026-07-02 HBKIS - Jul 2, 15:15 UTCJul 2, 15:20 UTC5m
2026-06-30 HBKIS - Jun 30, 16:40 UTCJun 30, 16:55 UTC15m
2026-06-29 HBKIS - Jun 29, 06:14 UTCJun 29, 06:29 UTC15m
2026-06-27 HBKIS - Jun 27, 09:09 UTCJun 27, 09:34 UTC25m
2026-06-27 HBKIS - Jun 27, 08:14 UTCJun 27, 09:00 UTC45m
2026-06-26 HBKIS - Jun 26, 15:54 UTCJun 26, 16:49 UTC55m
2026-06-26 HBKIS - Jun 26, 08:10 UTCJun 26, 08:50 UTC40m
2026-06-25 HBKIS - Jun 25, 08:55 UTCJun 25, 09:40 UTC45m
2026-06-25 HBKIS - Jun 25, 07:15 UTCJun 25, 08:09 UTC55m
2026-06-24 HBKIS - Jun 24, 10:39 UTCJun 24, 11:20 UTC40m
2026-06-24 HBKIS - Jun 24, 09:34 UTCJun 24, 10:19 UTC45m
2026-06-24 HBKIS - Jun 24, 08:20 UTCJun 24, 09:05 UTC45m
2026-06-23 HBKIS - Jun 23, 15:04 UTCJun 23, 15:50 UTC45m
2026-06-23 HBKIS - Jun 23, 13:29 UTCJun 23, 14:25 UTC55m
2026-06-22 HBKIS - Jun 22, 08:15 UTCJun 22, 09:19 UTC1h 5m
2026-06-20 HBKIS - Jun 20, 05:44 UTCJun 20, 06:39 UTC55m
2026-06-19 HBKIS - Jun 19, 14:39 UTCJun 19, 15:19 UTC40m
2026-06-19 HBKIS - Jun 19, 13:14 UTCJun 19, 13:59 UTC45m
2026-06-19 HBKIS - Jun 19, 11:54 UTCJun 19, 12:39 UTC45m
2026-06-19 HBKIS - Jun 19, 06:20 UTCJun 19, 07:09 UTC50m
2026-06-18 HBKIS - Jun 18, 15:50 UTCJun 18, 16:25 UTC35m
2026-06-18 HBKIS - Jun 18, 13:50 UTCJun 18, 14:30 UTC40m
2026-06-18 HBKIS - Jun 18, 09:50 UTCJun 18, 10:00 UTC10m
2026-06-18 HBKIS - Jun 18, 08:50 UTCJun 18, 09:35 UTC45m
2026-06-18 HBKIS - Jun 18, 07:30 UTCJun 18, 08:00 UTC30m
2026-06-17 HBKIS - Jun 17, 14:45 UTCJun 17, 15:10 UTC25m
2026-06-17 HBKIS - Jun 17, 12:45 UTCJun 17, 13:40 UTC55m
2026-06-16 HBKIS - Jun 16, 10:09 UTCJun 16, 10:30 UTC20m
2026-06-16 HBKIS - Jun 16, 07:40 UTCJun 16, 08:25 UTC45m
2026-06-15 HBKIS - Jun 15, 08:45 UTCJun 15, 09:30 UTC45m
2026-06-15 HBKIS - Jun 15, 06:49 UTCJun 15, 07:55 UTC1h 5m
2026-06-13 HBKIS - Jun 13, 13:10 UTCJun 13, 13:35 UTC25m
2026-06-13 HBKIS - Jun 13, 09:40 UTCJun 13, 10:35 UTC55m
2026-06-11 HBKIS - Jun 11, 15:20 UTCJun 11, 15:50 UTC30m
2026-06-11 HBKIS - Jun 11, 13:55 UTCJun 11, 14:45 UTC50m
2026-06-11 HBKIS - Jun 11, 12:10 UTCJun 11, 13:05 UTC55m
2026-06-11 HBKIS - Jun 11, 10:40 UTCJun 11, 11:25 UTC45m
2026-06-10 HBKIS - Jun 10, 09:05 UTCJun 10, 09:50 UTC45m
2026-06-10 HBKIS - Jun 10, 07:30 UTCJun 10, 08:10 UTC40m
2026-06-07 HBKIS - Jun 7, 07:45 UTCJun 7, 09:00 UTC1h 15m
2026-06-05 HBKIS - Jun 5, 09:45 UTCJun 5, 10:05 UTC20m
2026-06-05 HBKIS - Jun 5, 07:50 UTCJun 5, 08:45 UTC55m
2026-06-03 HBKIS - Jun 3, 13:10 UTCJun 3, 13:25 UTC15m
2026-06-03 HBKIS - Jun 3, 11:50 UTCJun 3, 12:30 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-KIS page for operator, model, and routing details .

Mode-S 4B1B4A frequently asked

What is Mode-S code 4B1B4A?
4B1B4A is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-KIS.
Where is Mode-S 4B1B4A registered?
Mode-S code 4B1B4A is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B1B4A broadcasting right now?
No active broadcast right now. Last signal was 6d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B1B4A, octal 22615512, decimal 4,922,186.
What flights does 4B1B4A operate?
Mode-S 4B1B4A has broadcast 1 distinct callsign, including HBKIS.