Apparatus

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sensors Mode-S transponder

4B1339

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-HHH · PILATUS PC-7 Astra

Hex
4B1339
Octal
22611471
Decimal
4,920,121
Country
CH
Tail
HB-HHH
Type
PC7
No current signal · last broadcast 2d ago
Flights observed
64
Distinct callsigns
1
Country
CH
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 4B1339.

Country allocation

The ICAO 24-bit address 4B1339 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
HBHHH - 64 2026-06-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-25 HBHHH - Jun 25, 08:04 UTCJun 25, 08:55 UTC50m
2026-06-25 HBHHH - Jun 25, 06:50 UTCJun 25, 07:19 UTC30m
2026-06-24 HBHHH - Jun 24, 10:45 UTCJun 24, 11:59 UTC1h 15m
2026-06-24 HBHHH BXO → BXO Jun 24, 07:50 UTCJun 24, 08:55 UTC1h 5m
2026-06-24 HBHHH BXO → BXO Jun 24, 06:20 UTCJun 24, 06:50 UTC30m
2026-06-23 HBHHH BXO → BXO Jun 23, 13:55 UTCJun 23, 14:49 UTC55m
2026-06-23 HBHHH BXO → BXO Jun 23, 10:10 UTCJun 23, 11:45 UTC1h 35m
2026-06-23 HBHHH BXO → BXO Jun 23, 07:15 UTCJun 23, 08:09 UTC55m
2026-06-18 HBHHH BXO → BXO Jun 18, 08:30 UTCJun 18, 08:45 UTC15m
2026-06-18 HBHHH BXO → BXO Jun 18, 07:00 UTCJun 18, 07:25 UTC25m
2026-06-17 HBHHH BXO → BXO Jun 17, 13:00 UTCJun 17, 14:45 UTC1h 45m
2026-06-17 HBHHH BXO → BXO Jun 17, 08:55 UTCJun 17, 09:55 UTC1h 0m
2026-06-17 HBHHH BXO → BXO Jun 17, 05:50 UTCJun 17, 06:50 UTC1h 0m
2026-06-16 HBHHH BXO → BXO Jun 16, 11:35 UTCJun 16, 12:55 UTC1h 20m
2026-06-16 HBHHH BXO → BXO Jun 16, 08:39 UTCJun 16, 09:50 UTC1h 10m
2026-06-16 HBHHH BXO → BXO Jun 16, 05:45 UTCJun 16, 07:25 UTC1h 40m
2026-06-15 HBHHH - Jun 15, 13:20 UTCJun 15, 15:04 UTC1h 45m
2026-06-15 HBHHH - Jun 15, 11:19 UTCJun 15, 12:30 UTC1h 10m
2026-06-15 HBHHH - Jun 15, 05:55 UTCJun 15, 06:55 UTC1h 0m
2026-06-12 HBHHH - Jun 12, 13:25 UTCJun 12, 14:50 UTC1h 25m
2026-06-12 HBHHH - Jun 12, 11:15 UTCJun 12, 12:25 UTC1h 10m
2026-06-12 HBHHH BXO → BXO Jun 12, 08:30 UTCJun 12, 10:05 UTC1h 35m
2026-06-12 HBHHH BXO → BXO Jun 12, 05:40 UTCJun 12, 07:05 UTC1h 25m
2026-06-09 HBHHH - Jun 9, 07:25 UTCJun 9, 08:00 UTC35m
2026-06-08 HBHHH BXO → BXO Jun 8, 12:50 UTCJun 8, 14:35 UTC1h 45m
2026-06-08 HBHHH BXO → BXO Jun 8, 11:05 UTCJun 8, 12:00 UTC55m
2026-06-08 HBHHH - Jun 8, 07:50 UTCJun 8, 09:35 UTC1h 45m
2026-06-08 HBHHH BXO → BXO Jun 8, 05:40 UTCJun 8, 06:45 UTC1h 5m
2026-06-05 HBHHH - Jun 5, 11:45 UTCJun 5, 12:50 UTC1h 5m
2026-06-05 HBHHH - Jun 5, 07:50 UTCJun 5, 09:40 UTC1h 50m
2026-06-05 HBHHH - Jun 5, 06:20 UTCJun 5, 07:00 UTC40m
2026-06-03 HBHHH - Jun 3, 13:05 UTCJun 3, 14:25 UTC1h 20m
2026-06-03 HBHHH - Jun 3, 11:15 UTCJun 3, 12:20 UTC1h 5m
2026-06-03 HBHHH - Jun 3, 05:55 UTCJun 3, 07:00 UTC1h 5m
2026-06-02 HBHHH - Jun 2, 11:50 UTCJun 2, 13:10 UTC1h 20m
2026-06-02 HBHHH BXO → BXO Jun 2, 07:50 UTCJun 2, 09:50 UTC2h 0m
2026-06-02 HBHHH BXO → BXO Jun 2, 05:45 UTCJun 2, 06:50 UTC1h 5m
2026-06-01 HBHHH BXO → BXO Jun 1, 12:25 UTCJun 1, 14:35 UTC2h 10m
2026-06-01 HBHHH - Jun 1, 07:05 UTCJun 1, 08:40 UTC1h 35m
2026-05-29 HBHHH - May 29, 06:05 UTCMay 29, 08:15 UTC2h 10m
2026-05-28 HBHHH - May 28, 07:20 UTCMay 28, 09:10 UTC1h 50m
2026-05-28 HBHHH BXO → BXO May 28, 05:20 UTCMay 28, 06:40 UTC1h 20m
2026-05-27 HBHHH BXO → BXO May 27, 12:50 UTCMay 27, 14:30 UTC1h 40m
2026-05-27 HBHHH BXO → BXO May 27, 11:05 UTCMay 27, 11:55 UTC50m
2026-05-27 HBHHH - May 27, 08:00 UTCMay 27, 09:45 UTC1h 45m
2026-05-27 HBHHH BXO → BXO May 27, 05:40 UTCMay 27, 07:00 UTC1h 21m
2026-05-26 HBHHH BXO → BXO May 26, 13:10 UTCMay 26, 15:00 UTC1h 50m
2026-05-26 HBHHH BXO → BXO May 26, 11:34 UTCMay 26, 12:14 UTC40m
2026-05-26 HBHHH - May 26, 07:49 UTCMay 26, 09:35 UTC1h 45m
2026-05-26 HBHHH BXO → BXO May 26, 05:59 UTCMay 26, 06:59 UTC1h 0m

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

Mode-S 4B1339 frequently asked

What is Mode-S code 4B1339?
4B1339 is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-HHH.
Where is Mode-S 4B1339 registered?
Mode-S code 4B1339 is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B1339 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B1339, octal 22611471, decimal 4,920,121.
What flights does 4B1339 operate?
Mode-S 4B1339 has broadcast 1 distinct callsign, including HBHHH.