Apparatus

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sensors Mode-S transponder

4B44A1

ICAO 24-bit transponder address · allocated to Switzerland

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

Hex
4B44A1
Octal
22642241
Decimal
4,932,769
Country
CH
Tail
HB-ZZT
Type
AS50
No current signal · last broadcast 5d ago
Flights observed
115
Distinct callsigns
1
Country
CH
Last broadcast
5d ago

Last known position

Most recent position reported by Mode-S 4B44A1.

Country allocation

The ICAO 24-bit address 4B44A1 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
HBZZT - 115 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 HBZZT - Jul 25, 06:00 UTCJul 25, 09:55 UTC3h 55m
2026-07-23 HBZZT - Jul 23, 11:25 UTCJul 23, 12:25 UTC1h 0m
2026-07-23 HBZZT - Jul 23, 07:50 UTCJul 23, 08:55 UTC1h 5m
2026-07-23 HBZZT - Jul 23, 05:20 UTCJul 23, 06:30 UTC1h 10m
2026-07-21 HBZZT - Jul 21, 09:20 UTCJul 21, 09:35 UTC15m
2026-07-20 HBZZT - Jul 20, 14:50 UTCJul 20, 15:15 UTC25m
2026-07-20 HBZZT - Jul 20, 12:05 UTCJul 20, 13:40 UTC1h 35m
2026-07-20 HBZZT - Jul 20, 08:50 UTCJul 20, 09:10 UTC20m
2026-07-20 HBZZT - Jul 20, 05:05 UTCJul 20, 05:25 UTC20m
2026-07-18 HBZZT - Jul 18, 12:55 UTCJul 18, 13:05 UTC10m
2026-07-18 HBZZT - Jul 18, 09:20 UTCJul 18, 09:40 UTC20m
2026-07-14 HBZZT - Jul 14, 14:10 UTCJul 14, 15:00 UTC50m
2026-07-14 HBZZT - Jul 14, 11:50 UTCJul 14, 13:25 UTC1h 35m
2026-07-14 HBZZT - Jul 14, 05:15 UTCJul 14, 05:45 UTC30m
2026-07-13 HBZZT - Jul 13, 14:15 UTCJul 13, 14:50 UTC35m
2026-07-13 HBZZT - Jul 13, 11:30 UTCJul 13, 13:00 UTC1h 30m
2026-07-13 HBZZT - Jul 13, 08:05 UTCJul 13, 09:30 UTC1h 25m
2026-07-13 HBZZT - Jul 13, 05:20 UTCJul 13, 05:40 UTC20m
2026-07-08 HBZZT - Jul 8, 11:25 UTCJul 8, 13:15 UTC1h 50m
2026-07-08 HBZZT - Jul 8, 08:40 UTCJul 8, 09:20 UTC40m
2026-07-08 HBZZT - Jul 8, 05:40 UTCJul 8, 07:50 UTC2h 10m
2026-07-04 HBZZT - Jul 4, 13:20 UTCJul 4, 13:45 UTC25m
2026-07-04 HBZZT - Jul 4, 06:50 UTCJul 4, 09:40 UTC2h 50m
2026-07-01 HBZZT - Jul 1, 13:15 UTCJul 1, 13:40 UTC25m
2026-07-01 HBZZT - Jul 1, 06:25 UTCJul 1, 06:40 UTC15m
2026-07-01 HBZZT - Jul 1, 05:30 UTCJul 1, 05:45 UTC15m
2026-06-27 HBZZT - Jun 27, 10:05 UTCJun 27, 10:14 UTC10m
2026-06-27 HBZZT - Jun 27, 07:34 UTCJun 27, 08:25 UTC50m
2026-06-27 HBZZT - Jun 27, 06:05 UTCJun 27, 06:54 UTC50m
2026-06-23 HBZZT - Jun 23, 14:59 UTCJun 23, 15:09 UTC10m
2026-06-23 HBZZT - Jun 23, 11:29 UTCJun 23, 13:45 UTC2h 15m
2026-06-23 HBZZT - Jun 23, 08:39 UTCJun 23, 09:14 UTC35m
2026-06-23 HBZZT - Jun 23, 05:29 UTCJun 23, 07:35 UTC2h 5m
2026-06-22 HBZZT - Jun 22, 14:55 UTCJun 22, 15:29 UTC35m
2026-06-22 HBZZT - Jun 22, 11:39 UTCJun 22, 11:54 UTC15m
2026-06-22 HBZZT - Jun 22, 08:19 UTCJun 22, 09:00 UTC40m
2026-06-20 HBZZT - Jun 20, 08:19 UTCJun 20, 08:49 UTC30m
2026-06-20 HBZZT - Jun 20, 05:34 UTCJun 20, 06:14 UTC40m
2026-06-19 HBZZT - Jun 19, 15:34 UTCJun 19, 16:09 UTC35m
2026-06-19 HBZZT - Jun 19, 05:54 UTCJun 19, 09:30 UTC3h 35m
2026-06-18 HBZZT - Jun 18, 12:50 UTCJun 18, 13:15 UTC25m
2026-06-18 HBZZT - Jun 18, 09:45 UTCJun 18, 10:00 UTC15m
2026-06-17 HBZZT - Jun 17, 07:25 UTCJun 17, 08:55 UTC1h 30m
2026-06-17 HBZZT - Jun 17, 06:00 UTCJun 17, 06:50 UTC50m
2026-06-15 HBZZT - Jun 15, 15:04 UTCJun 15, 15:15 UTC10m
2026-06-15 HBZZT - Jun 15, 05:35 UTCJun 15, 06:04 UTC30m
2026-06-13 HBZZT - Jun 13, 07:25 UTCJun 13, 09:40 UTC2h 15m
2026-06-13 HBZZT - Jun 13, 05:40 UTCJun 13, 06:10 UTC30m
2026-06-12 HBZZT - Jun 12, 06:05 UTCJun 12, 06:35 UTC30m
2026-06-11 HBZZT - Jun 11, 11:50 UTCJun 11, 12:05 UTC15m

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

Mode-S 4B44A1 frequently asked

What is Mode-S code 4B44A1?
4B44A1 is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-ZZT.
Where is Mode-S 4B44A1 registered?
Mode-S code 4B44A1 is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B44A1 broadcasting right now?
No active broadcast right now. Last signal was 5d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B44A1, octal 22642241, decimal 4,932,769.
What flights does 4B44A1 operate?
Mode-S 4B44A1 has broadcast 1 distinct callsign, including HBZZT.