Apparatus

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sensors Mode-S transponder

4B435D

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-ZNH · AEROSPATIALE AS-350 Ecureuil

Hex
4B435D
Octal
22641535
Decimal
4,932,445
Country
CH
Tail
HB-ZNH
Type
AS50
No current signal · last broadcast 22h ago
Flights observed
148
Distinct callsigns
1
Country
CH
Last broadcast
22h ago

Last known position

Most recent position reported by Mode-S 4B435D.

Country allocation

The ICAO 24-bit address 4B435D 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
HBZNH - 148 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 HBZNH - Jul 13, 13:10 UTCJul 13, 13:30 UTC20m
2026-07-10 HBZNH - Jul 10, 14:20 UTCJul 10, 14:45 UTC25m
2026-07-09 HBZNH - Jul 9, 11:50 UTCJul 9, 12:10 UTC20m
2026-07-09 HBZNH - Jul 9, 09:05 UTCJul 9, 09:25 UTC20m
2026-07-09 HBZNH - Jul 9, 07:45 UTCJul 9, 07:55 UTC10m
2026-07-09 HBZNH - Jul 9, 05:50 UTCJul 9, 06:35 UTC45m
2026-07-08 HBZNH - Jul 8, 08:15 UTCJul 8, 08:20 UTC5m
2026-07-08 HBZNH - Jul 8, 05:25 UTCJul 8, 05:55 UTC30m
2026-07-07 HBZNH - Jul 7, 08:30 UTCJul 7, 09:10 UTC40m
2026-07-07 HBZNH - Jul 7, 07:40 UTCJul 7, 07:50 UTC10m
2026-07-07 HBZNH - Jul 7, 05:45 UTCJul 7, 07:05 UTC1h 20m
2026-07-06 HBZNH - Jul 6, 14:25 UTCJul 6, 15:05 UTC40m
2026-07-06 HBZNH - Jul 6, 08:40 UTCJul 6, 08:50 UTC10m
2026-07-06 HBZNH - Jul 6, 05:10 UTCJul 6, 06:45 UTC1h 35m
2026-07-05 HBZNH - Jul 5, 08:25 UTCJul 5, 09:00 UTC35m
2026-07-03 HBZNH - Jul 3, 08:45 UTCJul 3, 14:35 UTC5h 50m
2026-07-03 HBZNH - Jul 3, 07:30 UTCJul 3, 08:05 UTC35m
2026-07-02 HBZNH - Jul 2, 12:15 UTCJul 2, 13:50 UTC1h 35m
2026-07-02 HBZNH - Jul 2, 10:35 UTCJul 2, 11:05 UTC30m
2026-07-02 HBZNH - Jul 2, 09:15 UTCJul 2, 09:35 UTC20m
2026-07-02 HBZNH - Jul 2, 08:10 UTCJul 2, 08:30 UTC20m
2026-07-02 HBZNH - Jul 2, 07:25 UTCJul 2, 07:35 UTC10m
2026-07-02 HBZNH - Jul 2, 05:45 UTCJul 2, 06:15 UTC30m
2026-07-01 HBZNH - Jul 1, 12:05 UTCJul 1, 13:25 UTC1h 20m
2026-07-01 HBZNH - Jul 1, 11:00 UTCJul 1, 11:10 UTC10m
2026-07-01 HBZNH - Jul 1, 07:00 UTCJul 1, 07:15 UTC15m
2026-06-30 HBZNH - Jun 30, 11:50 UTCJun 30, 12:40 UTC50m
2026-06-30 HBZNH - Jun 30, 05:00 UTCJun 30, 05:25 UTC25m
2026-06-29 HBZNH - Jun 29, 06:24 UTCJun 29, 07:05 UTC40m
2026-06-26 HBZNH - Jun 26, 11:05 UTCJun 26, 12:34 UTC1h 30m
2026-06-26 HBZNH - Jun 26, 07:00 UTCJun 26, 07:39 UTC40m
2026-06-25 HBZNH - Jun 25, 12:04 UTCJun 25, 13:29 UTC1h 25m
2026-06-25 HBZNH - Jun 25, 09:20 UTCJun 25, 09:50 UTC30m
2026-06-25 HBZNH - Jun 25, 06:00 UTCJun 25, 07:59 UTC2h 0m
2026-06-24 HBZNH - Jun 24, 10:55 UTCJun 24, 11:14 UTC20m
2026-06-24 HBZNH - Jun 24, 06:59 UTCJun 24, 08:09 UTC1h 10m
2026-06-24 HBZNH - Jun 24, 05:05 UTCJun 24, 06:20 UTC1h 15m
2026-06-23 HBZNH - Jun 23, 17:39 UTCJun 23, 18:34 UTC55m
2026-06-23 HBZNH - Jun 23, 16:09 UTCJun 23, 16:54 UTC45m
2026-06-23 HBZNH - Jun 23, 12:40 UTCJun 23, 15:15 UTC2h 35m
2026-06-23 HBZNH - Jun 23, 11:19 UTCJun 23, 11:54 UTC35m
2026-06-22 HBZNH - Jun 22, 11:30 UTCJun 22, 12:00 UTC30m
2026-06-22 HBZNH - Jun 22, 08:44 UTCJun 22, 09:10 UTC25m
2026-06-22 HBZNH - Jun 22, 05:54 UTCJun 22, 08:10 UTC2h 15m
2026-06-19 HBZNH - Jun 19, 10:59 UTCJun 19, 13:14 UTC2h 15m
2026-06-19 HBZNH - Jun 19, 05:00 UTCJun 19, 10:14 UTC5h 15m
2026-06-18 HBZNH - Jun 18, 11:05 UTCJun 18, 13:05 UTC2h 0m
2026-06-18 HBZNH - Jun 18, 09:15 UTCJun 18, 09:55 UTC40m
2026-06-18 HBZNH - Jun 18, 07:45 UTCJun 18, 08:00 UTC15m
2026-06-18 HBZNH - Jun 18, 06:35 UTCJun 18, 07:05 UTC30m

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

Mode-S 4B435D frequently asked

What is Mode-S code 4B435D?
4B435D is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-ZNH.
Where is Mode-S 4B435D registered?
Mode-S code 4B435D is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B435D broadcasting right now?
No active broadcast right now. Last signal was 22h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B435D, octal 22641535, decimal 4,932,445.
What flights does 4B435D operate?
Mode-S 4B435D has broadcast 1 distinct callsign, including HBZNH.