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
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
195
Distinct callsigns
20
Country
CH
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S 4B191B.

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 Swiss International Air Lines 26 2026-07-24
SWR139 Swiss International Air Lines 23 2026-07-25
SWR181 - 16 2026-07-22
SWR180 Swiss International Air Lines 15 2026-07-21
SWR40 Swiss International Air Lines 11 2026-07-26
SWR39 - 11 2026-07-21
SWR35G Swiss International Air Lines 10 2026-07-20
SWR64E Swiss International Air Lines 9 2026-05-30
SWR41G Swiss International Air Lines 9 2026-06-06
SWR9G - 8 2026-07-20
SWR8T - 8 2026-07-19
SWR93 - 7 2026-06-12
SWR92 Swiss International Air Lines 7 2026-06-11
SWR65 Swiss International Air Lines 7 2026-05-31
SWR177 Swiss International Air Lines 7 2026-07-23
SWR176 Swiss International Air Lines 7 2026-07-22
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
2026-07-26 SWR40 ZRH → LAX Jul 26, 11:35 UTCJul 26, 22:45 UTC11h 10m
2026-07-25 SWR139 HKG → ZRH Jul 25, 23:30 UTCJul 26, 04:05 UTC4h 35m
2026-07-25 SWR139 HKG → ZRH Jul 25, 15:10 UTCJul 25, 15:25 UTC15m
2026-07-24 SWR138 ZRH → HKG Jul 24, 21:00 UTCJul 25, 08:45 UTC11h 45m
2026-07-23 SWR177 SIN → ZRH Jul 23, 16:05 UTCJul 24, 04:25 UTC12h 20m
2026-07-22 SWR176 ZRH → SIN Jul 22, 20:55 UTCJul 23, 08:45 UTC11h 50m
2026-07-22 SWR181 - Jul 22, 10:20 UTCJul 22, 17:40 UTC7h 20m
2026-07-21 SWR180 ZRH → BKK Jul 21, 16:25 UTCJul 22, 02:25 UTC10h 0m
2026-07-21 SWR39 SFO → ZRH Jul 21, 03:05 UTCJul 21, 13:25 UTC10h 20m
2026-07-20 SWR35G ZRH → SFO Jul 20, 12:15 UTCJul 20, 23:45 UTC11h 30m
2026-07-20 SWR9G - Jul 20, 00:40 UTCJul 20, 08:45 UTC8h 5m
2026-07-19 SWR8T ZRH → ORD Jul 19, 12:10 UTCJul 19, 20:50 UTC8h 40m
2026-07-18 SWR139 HKG → ZRH Jul 18, 18:15 UTCJul 19, 04:10 UTC9h 55m
2026-07-18 SWR139 HKG → ZRH Jul 18, 16:00 UTCJul 18, 16:20 UTC20m
2026-07-17 SWR138 ZRH → HKG Jul 17, 21:10 UTCJul 18, 08:20 UTC11h 11m
2026-07-17 SWR39 SFO → ZRH Jul 17, 03:10 UTCJul 17, 13:35 UTC10h 25m
2026-07-16 SWR35G ZRH → SFO Jul 16, 12:00 UTCJul 16, 23:25 UTC11h 25m
2026-07-16 SWR9G - Jul 16, 00:40 UTCJul 16, 08:45 UTC8h 5m
2026-07-15 SWR8T ZRH → ORD Jul 15, 12:45 UTCJul 15, 21:15 UTC8h 30m
2026-07-15 SWR9G - Jul 15, 00:55 UTCJul 15, 09:05 UTC8h 10m
2026-07-14 SWR8T ZRH → ORD Jul 14, 11:40 UTCJul 14, 20:20 UTC8h 40m
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

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?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
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.