Apparatus

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sensors Mode-S transponder

4B1A00

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-JWA · BOMBARDIER CL-600 Challenger

Hex
4B1A00
Octal
22615000
Decimal
4,921,856
Country
CH
Tail
HB-JWA
Type
CL60
Broadcasting now · callsign SAZ71 · 38,975 ft
Flights observed
235
Distinct callsigns
12
Country
CH
Last broadcast
16m ago

Current position

4B1A00 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4B1A00 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 12 distinct

Callsign Airline Flights Last seen
SAZ51 - 63 2026-07-16
SAZ52 - 61 2026-07-17
SAZ53 - 44 2026-07-17
SAZ54 - 28 2026-07-16
SAZ55 - 15 2026-07-08
SAZ56 - 9 2026-06-30
SAZ57 - 6 2026-06-30
SAZ71 - 3 2026-07-18
SAZ72 - 2 2026-06-21
SAZ58 - 2 2026-06-30
SAZ76 - 1 2026-06-08
SAZ74 - 1 2026-06-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 SAZ71 - Jul 18, 07:30 UTCJul 18, 08:00 UTC30m
2026-07-17 SAZ53 - Jul 17, 18:34 UTCJul 17, 19:05 UTC30m
2026-07-17 SAZ52 BCN → GVA Jul 17, 08:49 UTCJul 17, 17:50 UTC9h 0m
2026-07-16 SAZ54 - Jul 16, 16:00 UTCJul 16, 18:05 UTC2h 5m
2026-07-16 SAZ53 - Jul 16, 13:10 UTCJul 16, 14:20 UTC1h 10m
2026-07-16 SAZ52 - Jul 16, 10:10 UTCJul 16, 11:45 UTC1h 35m
2026-07-16 SAZ51 - Jul 16, 05:05 UTCJul 16, 06:20 UTC1h 15m
2026-07-15 SAZ52 - Jul 15, 11:15 UTCJul 15, 12:55 UTC1h 40m
2026-07-15 SAZ51 - Jul 15, 08:25 UTCJul 15, 09:50 UTC1h 25m
2026-07-13 SAZ51 - Jul 13, 10:30 UTCJul 13, 11:40 UTC1h 10m
2026-07-09 SAZ54 ZRH → BQH Jul 9, 16:10 UTCJul 9, 17:30 UTC1h 20m
2026-07-09 SAZ53 - Jul 9, 12:00 UTCJul 9, 13:40 UTC1h 40m
2026-07-09 SAZ52 - Jul 9, 08:00 UTCJul 9, 08:55 UTC55m
2026-07-09 SAZ51 - Jul 9, 06:05 UTCJul 9, 07:20 UTC1h 15m
2026-07-08 SAZ55 - Jul 8, 14:35 UTCJul 8, 15:05 UTC30m
2026-07-08 SAZ54 - Jul 8, 13:00 UTCJul 8, 13:55 UTC55m
2026-07-08 SAZ53 - Jul 8, 11:05 UTCJul 8, 11:55 UTC50m
2026-07-08 SAZ52 FCN → ZRH Jul 8, 09:10 UTCJul 8, 10:10 UTC1h 0m
2026-07-08 SAZ51 ZRH → FCN Jul 8, 07:00 UTCJul 8, 08:15 UTC1h 15m
2026-07-07 SAZ53 - Jul 7, 08:15 UTCJul 7, 09:00 UTC45m
2026-07-07 SAZ52 - Jul 7, 06:55 UTCJul 7, 07:35 UTC40m
2026-07-07 SAZ51 - Jul 7, 05:00 UTCJul 7, 05:55 UTC55m
2026-07-06 SAZ54 - Jul 6, 11:00 UTCJul 6, 11:30 UTC30m
2026-07-06 SAZ53 - Jul 6, 08:55 UTCJul 6, 10:05 UTC1h 10m
2026-07-06 SAZ52 - Jul 6, 07:50 UTCJul 6, 08:20 UTC30m
2026-07-06 SAZ51 ZRH → VLC Jul 6, 05:30 UTCJul 6, 07:05 UTC1h 35m
2026-07-05 SAZ54 - Jul 5, 14:15 UTCJul 5, 16:05 UTC1h 50m
2026-07-05 SAZ53 - Jul 5, 12:55 UTCJul 5, 13:20 UTC25m
2026-07-05 SAZ51 - Jul 5, 06:30 UTCJul 5, 11:55 UTC5h 25m
2026-07-04 SAZ52 EDI → ZRH Jul 4, 13:05 UTCJul 4, 14:45 UTC1h 40m
2026-07-04 SAZ51 ZRH → EDI Jul 4, 08:00 UTCJul 4, 10:05 UTC2h 5m
2026-07-03 SAZ51 ZRH → ZRH Jul 3, 06:55 UTCJul 3, 16:55 UTC10h 0m
2026-07-02 SAZ54 BRN → ZRH Jul 2, 16:00 UTCJul 2, 16:20 UTC20m
2026-07-02 SAZ53 - Jul 2, 14:10 UTCJul 2, 15:20 UTC1h 10m
2026-07-02 SAZ52 - Jul 2, 10:20 UTCJul 2, 13:20 UTC3h 0m
2026-07-02 SAZ51 - Jul 2, 08:05 UTCJul 2, 09:15 UTC1h 10m
2026-07-02 SAZ51 - Jul 2, 05:25 UTCJul 2, 08:00 UTC2h 35m
2026-07-01 SAZ53 GVA → ZRH Jul 1, 11:45 UTCJul 1, 12:15 UTC30m
2026-07-01 SAZ52 - Jul 1, 09:20 UTCJul 1, 11:00 UTC1h 40m
2026-07-01 SAZ51 - Jul 1, 07:00 UTCJul 1, 07:55 UTC55m
2026-06-30 SAZ58 - Jun 30, 22:30 UTCJun 30, 23:00 UTC30m
2026-06-30 SAZ57 - Jun 30, 19:25 UTCJun 30, 21:45 UTC2h 20m
2026-06-30 SAZ56 - Jun 30, 18:05 UTCJun 30, 18:35 UTC30m
2026-06-30 SAZ55 - Jun 30, 15:15 UTCJun 30, 16:45 UTC1h 30m
2026-06-30 SAZ54 GRZ → ZRH Jun 30, 13:25 UTCJun 30, 14:20 UTC55m
2026-06-30 SAZ53 - Jun 30, 10:10 UTCJun 30, 11:10 UTC1h 0m
2026-06-30 SAZ52 - Jun 30, 08:00 UTCJun 30, 09:05 UTC1h 5m
2026-06-30 SAZ51 - Jun 30, 05:50 UTCJun 30, 07:15 UTC1h 25m
2026-06-29 SAZ56 ATH → ZRH Jun 29, 17:34 UTCJun 29, 19:49 UTC2h 15m
2026-06-29 SAZ55 - Jun 29, 16:00 UTCJun 29, 16:29 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-JWA page for operator, model, and routing details .

Mode-S 4B1A00 frequently asked

What is Mode-S code 4B1A00?
4B1A00 is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-JWA.
Where is Mode-S 4B1A00 registered?
Mode-S code 4B1A00 is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B1A00 broadcasting right now?
Yes. Mode-S 4B1A00 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B1A00, octal 22615000, decimal 4,921,856.
What flights does 4B1A00 operate?
Mode-S 4B1A00 has broadcast 12 distinct callsigns, including SAZ51, SAZ52, SAZ53, SAZ54, SAZ55.