Apparatus

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sensors Mode-S transponder

4B0291

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-AZH · EMBRAER ERJ-190-300

Hex
4B0291
Octal
22601221
Decimal
4,915,857
Country
CH
Tail
HB-AZH
Type
E290
No current signal · last broadcast 8d ago
Flights observed
294
Distinct callsigns
20
Country
CH
Last broadcast
8d ago

Last known position

Most recent position reported by Mode-S 4B0291.

Country allocation

The ICAO 24-bit address 4B0291 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 20 distinct

Callsign Airline Flights Last seen
OAW223 - 23 2026-07-19
OAW222 - 23 2026-07-19
OAW303 - 15 2026-07-18
OAW302 - 15 2026-07-18
OAW701 Helvetic Airways 8 2026-07-17
OAW5227 Helvetic Airways 8 2026-07-16
OAW5226 Helvetic Airways 8 2026-07-16
OAW323 - 8 2026-07-19
OAW322 Helvetic Airways 8 2026-07-19
OAW700 Helvetic Airways 7 2026-07-17
OAW313 - 7 2026-07-13
OAW312 - 7 2026-07-13
OAW707 Helvetic Airways 6 2026-07-17
OAW706 Helvetic Airways 6 2026-07-17
SWR4AH Swiss International Air Lines 5 2026-05-20
SWR457 Swiss International Air Lines 5 2026-05-20
SWR7PW - 4 2026-06-23
SWR478V Swiss International Air Lines 4 2026-05-19
SWR3F Swiss International Air Lines 4 2026-05-19
SWR166M Swiss International Air Lines 4 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 OAW9223 - Jul 26, 17:00 UTCJul 26, 18:40 UTC1h 40m
2026-07-19 OAW223 - Jul 19, 18:35 UTCJul 19, 19:20 UTC45m
2026-07-19 OAW222 - Jul 19, 15:55 UTCJul 19, 17:15 UTC1h 20m
2026-07-19 OAW323 - Jul 19, 11:55 UTCJul 19, 14:50 UTC2h 55m
2026-07-19 OAW322 BRN → RHO Jul 19, 07:55 UTCJul 19, 10:25 UTC2h 30m
2026-07-18 OAW303 - Jul 18, 18:05 UTCJul 18, 20:50 UTC2h 45m
2026-07-18 OAW302 - Jul 18, 14:10 UTCJul 18, 16:35 UTC2h 25m
2026-07-17 OAW701 DJE → BRN Jul 17, 16:34 UTCJul 17, 18:40 UTC2h 5m
2026-07-17 OAW700 BRN → DJE Jul 17, 13:05 UTCJul 17, 14:55 UTC1h 50m
2026-07-17 OAW707 MIR → BRN Jul 17, 10:20 UTCJul 17, 11:55 UTC1h 35m
2026-07-17 OAW706 BRN → MIR Jul 17, 06:54 UTCJul 17, 08:35 UTC1h 40m
2026-07-16 OAW223 - Jul 16, 16:44 UTCJul 16, 18:05 UTC1h 20m
2026-07-16 OAW5226 SIR → PMI Jul 16, 14:10 UTCJul 16, 15:25 UTC1h 15m
2026-07-16 OAW5227 PMI → SIR Jul 16, 11:50 UTCJul 16, 13:10 UTC1h 20m
2026-07-16 OAW222 - Jul 16, 09:00 UTCJul 16, 10:20 UTC1h 20m
2026-07-15 OAW303 - Jul 15, 10:50 UTCJul 15, 13:35 UTC2h 45m
2026-07-15 OAW302 - Jul 15, 07:00 UTCJul 15, 09:25 UTC2h 25m
2026-07-13 OAW223 - Jul 13, 16:50 UTCJul 13, 18:05 UTC1h 15m
2026-07-13 OAW222 - Jul 13, 14:05 UTCJul 13, 15:30 UTC1h 25m
2026-07-13 OAW313 - Jul 13, 10:15 UTCJul 13, 13:15 UTC3h 0m
2026-07-13 OAW312 BRN → KGS Jul 13, 05:55 UTCJul 13, 08:25 UTC2h 30m
2026-07-12 OAW223 - Jul 12, 18:45 UTCJul 12, 20:05 UTC1h 20m
2026-07-12 OAW222 - Jul 12, 15:55 UTCJul 12, 17:25 UTC1h 30m
2026-07-12 OAW323 RHO → BRN Jul 12, 12:01 UTCJul 12, 14:50 UTC2h 50m
2026-07-12 OAW322 BRN → RHO Jul 12, 07:40 UTCJul 12, 10:25 UTC2h 45m
2026-07-11 OAW303 - Jul 11, 18:05 UTCJul 11, 20:40 UTC2h 35m
2026-07-11 OAW302 - Jul 11, 14:10 UTCJul 11, 16:35 UTC2h 25m
2026-07-10 OAW701 DJE → BRN Jul 10, 16:35 UTCJul 10, 18:35 UTC2h 0m
2026-07-10 OAW700 BRN → DJE Jul 10, 13:10 UTCJul 10, 15:10 UTC2h 0m
2026-07-10 OAW707 - Jul 10, 10:00 UTCJul 10, 11:40 UTC1h 40m
2026-07-10 OAW706 - Jul 10, 06:50 UTCJul 10, 08:35 UTC1h 45m
2026-07-09 OAW223 - Jul 9, 17:00 UTCJul 9, 18:20 UTC1h 20m
2026-07-09 OAW5226 SIR → PMI Jul 9, 14:15 UTCJul 9, 15:25 UTC1h 10m
2026-07-09 OAW5227 PMI → SIR Jul 9, 11:55 UTCJul 9, 13:15 UTC1h 20m
2026-07-09 OAW222 - Jul 9, 09:05 UTCJul 9, 10:20 UTC1h 15m
2026-07-08 OAW303 - Jul 8, 10:45 UTCJul 8, 13:25 UTC2h 40m
2026-07-08 OAW302 - Jul 8, 06:55 UTCJul 8, 09:15 UTC2h 20m
2026-07-06 OAW223 - Jul 6, 16:35 UTCJul 6, 18:00 UTC1h 25m
2026-07-06 OAW222 - Jul 6, 14:00 UTCJul 6, 15:15 UTC1h 15m
2026-07-06 OAW313 - Jul 6, 10:15 UTCJul 6, 13:00 UTC2h 45m
2026-07-06 OAW312 BRN → KGS Jul 6, 06:00 UTCJul 6, 08:30 UTC2h 30m
2026-07-05 OAW223 - Jul 5, 18:55 UTCJul 5, 20:20 UTC1h 25m
2026-07-05 OAW222 - Jul 5, 16:15 UTCJul 5, 17:35 UTC1h 20m
2026-07-05 OAW323 RHO → BRN Jul 5, 12:35 UTCJul 5, 15:25 UTC2h 50m
2026-07-05 OAW322 BRN → RHO Jul 5, 08:40 UTCJul 5, 11:10 UTC2h 30m
2026-07-04 OAW303 - Jul 4, 18:35 UTCJul 4, 21:15 UTC2h 40m
2026-07-04 OAW302 - Jul 4, 14:55 UTCJul 4, 17:10 UTC2h 15m
2026-07-04 OAW1321 - Jul 4, 11:00 UTCJul 4, 11:25 UTC25m
2026-07-04 OAW8320 - Jul 4, 08:45 UTCJul 4, 10:00 UTC1h 15m
2026-07-04 OAW1320 BRN → PEG Jul 4, 06:00 UTCJul 4, 06:55 UTC55m

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

Mode-S 4B0291 frequently asked

What is Mode-S code 4B0291?
4B0291 is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-AZH.
Where is Mode-S 4B0291 registered?
Mode-S code 4B0291 is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B0291 broadcasting right now?
No active broadcast right now. Last signal was 8d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B0291, octal 22601221, decimal 4,915,857.
What flights does 4B0291 operate?
Mode-S 4B0291 has broadcast 20 distinct callsigns, including OAW223, OAW222, OAW303, OAW302, OAW701.