Apparatus

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sensors Mode-S transponder

4B191B

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-JNF · BOEING 777-300ER

Hex
4B191B
Octal
22614433
Decimal
4,921,627
Country
CH
Tail
HB-JNF
Type
B77W
Broadcasting now · callsign SWR8T · 4,900 ft
Flights observed
174
Distinct callsigns
20
Country
CH
Last broadcast
2h ago

Current position

4B191B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4B191B 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
SWR138 - 24 2026-06-20
SWR139 - 19 2026-06-21
SWR181 - 15 2026-07-08
SWR180 - 14 2026-07-07
SWR40 Swiss International Air Lines 10 2026-06-05
SWR64E Swiss International Air Lines 9 2026-05-30
SWR41G Swiss International Air Lines 9 2026-06-06
SWR39 - 9 2026-07-07
SWR35G - 8 2026-07-06
SWR93 - 7 2026-06-12
SWR92 Swiss International Air Lines 7 2026-06-11
SWR65 Swiss International Air Lines 7 2026-05-31
SWR177 - 6 2026-07-12
SWR176 - 6 2026-07-11
SWR9G - 5 2026-07-14
SWR8T - 5 2026-07-13
SWR161 - 5 2026-07-11
SWR160 - 5 2026-07-10
SWR137 - 2 2026-07-02
SWR136 - 2 2026-06-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWR9G - Jul 14, 01:00 UTCJul 14, 09:10 UTC8h 10m
2026-07-13 SWR8T ZRH → ORD Jul 13, 13:25 UTCJul 13, 22:00 UTC8h 35m
2026-07-12 SWR177 - Jul 12, 16:05 UTCJul 13, 04:10 UTC12h 5m
2026-07-11 SWR176 - Jul 11, 21:10 UTCJul 12, 08:40 UTC11h 30m
2026-07-11 SWR161 - Jul 11, 02:35 UTCJul 11, 16:25 UTC13h 50m
2026-07-10 SWR160 ZRH → NRT Jul 10, 11:40 UTCJul 10, 23:40 UTC12h 0m
2026-07-09 SWR177 - Jul 9, 16:05 UTCJul 10, 04:15 UTC12h 10m
2026-07-08 SWR176 - Jul 8, 21:10 UTCJul 9, 09:05 UTC11h 55m
2026-07-08 SWR181 - Jul 8, 06:05 UTCJul 8, 17:15 UTC11h 10m
2026-07-07 SWR180 - Jul 7, 16:35 UTCJul 8, 02:40 UTC10h 5m
2026-07-07 SWR39 - Jul 7, 03:00 UTCJul 7, 13:15 UTC10h 15m
2026-07-06 SWR35G - Jul 6, 12:20 UTCJul 6, 23:45 UTC11h 25m
2026-07-05 SWR177 - Jul 5, 16:00 UTCJul 6, 04:15 UTC12h 15m
2026-07-04 SWR176 - Jul 4, 20:55 UTCJul 5, 08:40 UTC11h 45m
2026-07-04 SWR39 SFO → ZRH Jul 4, 03:00 UTCJul 4, 13:35 UTC10h 35m
2026-07-03 SWR35G - Jul 3, 12:40 UTCJul 4, 00:10 UTC11h 30m
2026-07-02 SWR137 - Jul 2, 18:50 UTCJul 3, 05:10 UTC10h 20m
2026-07-02 SWR137 - Jul 2, 16:40 UTCJul 2, 16:55 UTC15m
2026-06-22 SWR136 - Jun 22, 03:50 UTCJun 22, 04:24 UTC35m
2026-06-21 SWR136 - Jun 21, 16:54 UTCJun 22, 03:05 UTC10h 10m
2026-06-21 SWR139 - Jun 21, 00:14 UTCJun 21, 04:20 UTC4h 5m
2026-06-20 SWR139 - Jun 20, 16:09 UTCJun 20, 16:29 UTC20m
2026-06-20 SWR138 - Jun 20, 08:29 UTCJun 20, 08:59 UTC30m
2026-06-19 SWR138 - Jun 19, 21:49 UTCJun 20, 04:44 UTC6h 55m
2026-06-19 SWR39 SFO → ZRH Jun 19, 03:09 UTCJun 19, 13:59 UTC10h 50m
2026-06-18 SWR35G ZRH → SFO Jun 18, 12:10 UTCJun 18, 23:30 UTC11h 20m
2026-06-18 SWR9G - Jun 18, 01:05 UTCJun 18, 08:55 UTC7h 50m
2026-06-17 SWR8T ZRH → ORD Jun 17, 12:00 UTCJun 17, 20:45 UTC8h 45m
2026-06-16 SWR139 - Jun 16, 20:40 UTCJun 17, 04:10 UTC7h 30m
2026-06-16 SWR139 - Jun 16, 15:45 UTCJun 16, 16:05 UTC20m
2026-06-16 SWR138 - Jun 16, 07:45 UTCJun 16, 08:25 UTC40m
2026-06-15 SWR138 - Jun 15, 20:54 UTCJun 16, 07:05 UTC10h 10m
2026-06-15 SWR181 - Jun 15, 06:15 UTCJun 15, 17:34 UTC11h 20m
2026-06-14 SWR180 - Jun 14, 16:35 UTCJun 15, 02:39 UTC10h 5m
2026-06-14 SWR39 SFO → ZRH Jun 14, 07:45 UTCJun 14, 13:35 UTC5h 50m
2026-06-14 SWR39 SFO → ZRH Jun 14, 02:55 UTCJun 14, 07:40 UTC4h 45m
2026-06-13 SWR35G ZRH → SFO Jun 13, 12:20 UTCJun 13, 23:35 UTC11h 15m
2026-06-12 SWR93 - Jun 12, 22:05 UTCJun 13, 08:40 UTC10h 34m
2026-06-11 SWR92 ZRH → GRU Jun 11, 21:05 UTCJun 12, 08:25 UTC11h 21m
2026-06-11 SWR139 HKG → ZRH Jun 11, 00:05 UTCJun 11, 04:20 UTC4h 15m
2026-06-10 SWR139 HKG → ZRH Jun 10, 15:45 UTCJun 10, 16:00 UTC15m
2026-06-10 SWR138 ZRH → HKG Jun 10, 07:30 UTCJun 10, 07:55 UTC25m
2026-06-09 SWR138 ZRH → HKG Jun 9, 20:45 UTCJun 10, 05:15 UTC8h 30m
2026-06-09 SWR161 NRT → ZRH Jun 9, 02:30 UTCJun 9, 15:50 UTC13h 20m
2026-06-08 SWR160 ZRH → NRT Jun 8, 11:55 UTCJun 8, 23:55 UTC12h 0m
2026-06-08 SWR139 HKG → ZRH Jun 8, 00:05 UTCJun 8, 04:20 UTC4h 15m
2026-06-07 SWR139 HKG → ZRH Jun 7, 16:00 UTCJun 7, 16:15 UTC15m
2026-06-06 SWR138 ZRH → HKG Jun 6, 20:55 UTCJun 7, 08:15 UTC11h 20m
2026-06-06 SWR41G LAX → ZRH Jun 6, 02:55 UTCJun 6, 13:20 UTC10h 25m
2026-06-05 SWR40 ZRH → LAX Jun 5, 11:55 UTCJun 5, 23:05 UTC11h 10m

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

Mode-S 4B191B frequently asked

What is Mode-S code 4B191B?
4B191B is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-JNF.
Where is Mode-S 4B191B registered?
Mode-S code 4B191B is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B191B broadcasting right now?
Yes. Mode-S 4B191B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B191B, octal 22614433, decimal 4,921,627.
What flights does 4B191B operate?
Mode-S 4B191B has broadcast 20 distinct callsigns, including SWR138, SWR139, SWR181, SWR180, SWR40.