Apparatus

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sensors Mode-S transponder

4B1921

ICAO 24-bit transponder address · allocated to Switzerland

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

Hex
4B1921
Octal
22614441
Decimal
4,921,633
Country
CH
Tail
HB-JNL
Type
B77W
Broadcasting now · callsign SWR177 · 32,000 ft
Flights observed
196
Distinct callsigns
20
Country
CH
Last broadcast
Jul 26, 22:15 UTC

Current position

4B1921 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4B1921 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
SWR93 - 20 2026-07-16
SWR92 Swiss International Air Lines 15 2026-07-26
SWR40 Swiss International Air Lines 15 2026-07-24
SWR139 Swiss International Air Lines 15 2026-07-20
SWR138 - 15 2026-07-19
SWR160 - 13 2026-07-06
SWR41G Swiss International Air Lines 12 2026-07-25
SWR180 Swiss International Air Lines 12 2026-07-25
SWR181 Swiss International Air Lines 11 2026-07-26
SWR161 - 11 2026-07-07
SWR64E - 10 2026-07-21
SWR65 - 9 2026-07-22
SWR177 - 8 2026-07-08
SWR176 - 8 2026-07-07
SWR39 Swiss International Air Lines 7 2026-07-23
SWR35G Swiss International Air Lines 7 2026-07-22
SWR9G Swiss International Air Lines 3 2026-06-14
SWR8T Swiss International Air Lines 3 2026-06-13
SWR5573 - 1 2026-06-10
SWR5570 Swiss International Air Lines 1 2026-06-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWR92 ZRH → GRU Jul 26, 21:15 UTCJul 26, 22:15 UTC1h 0m
2026-07-26 SWR181 BKK → ZRH Jul 26, 06:05 UTCJul 26, 16:55 UTC10h 51m
2026-07-25 SWR180 ZRH → BKK Jul 25, 16:20 UTCJul 26, 02:35 UTC10h 15m
2026-07-25 SWR41G LAX → ZRH Jul 25, 02:55 UTCJul 25, 12:55 UTC10h 0m
2026-07-24 SWR40 ZRH → LAX Jul 24, 12:10 UTCJul 24, 23:40 UTC11h 30m
2026-07-23 SWR39 SFO → ZRH Jul 23, 03:05 UTCJul 23, 13:05 UTC10h 0m
2026-07-22 SWR35G ZRH → SFO Jul 22, 12:10 UTCJul 22, 23:30 UTC11h 20m
2026-07-22 SWR65 - Jul 22, 00:00 UTCJul 22, 00:30 UTC30m
2026-07-21 SWR64E - Jul 21, 12:25 UTCJul 21, 21:20 UTC8h 55m
2026-07-20 SWR139 HKG → ZRH Jul 20, 18:05 UTCJul 21, 04:10 UTC10h 5m
2026-07-20 SWR139 HKG → ZRH Jul 20, 15:50 UTCJul 20, 16:05 UTC15m
2026-07-19 SWR138 ZRH → HKG Jul 19, 21:20 UTCJul 20, 08:30 UTC11h 10m
2026-07-19 SWR181 - Jul 19, 06:20 UTCJul 19, 17:05 UTC10h 45m
2026-07-18 SWR180 ZRH → BKK Jul 18, 16:40 UTCJul 19, 03:00 UTC10h 20m
2026-07-18 SWR39 SFO → ZRH Jul 18, 02:55 UTCJul 18, 13:15 UTC10h 20m
2026-07-17 SWR35G - Jul 17, 12:15 UTCJul 17, 23:35 UTC11h 20m
2026-07-16 SWR93 - Jul 16, 21:45 UTCJul 17, 08:15 UTC10h 30m
2026-07-15 SWR92 - Jul 15, 21:20 UTCJul 16, 08:55 UTC11h 35m
2026-07-08 SWR177 - Jul 8, 20:25 UTCJul 9, 08:20 UTC11h 55m
2026-07-07 SWR176 - Jul 7, 21:05 UTCJul 8, 08:40 UTC11h 35m
2026-07-07 SWR161 - Jul 7, 02:20 UTCJul 7, 16:25 UTC14h 5m
2026-07-06 SWR160 - Jul 6, 11:50 UTCJul 7, 00:00 UTC12h 10m
2026-07-06 SWR65 - Jul 6, 01:00 UTCJul 6, 09:30 UTC8h 30m
2026-07-05 SWR64E - Jul 5, 11:50 UTCJul 5, 21:20 UTC9h 30m
2026-07-04 SWR139 - Jul 4, 18:10 UTCJul 5, 04:15 UTC10h 5m
2026-07-04 SWR139 - Jul 4, 15:55 UTCJul 4, 16:10 UTC15m
2026-07-04 SWR138 - Jul 4, 08:25 UTCJul 4, 08:30 UTC5m
2026-07-04 SWR138 - Jul 4, 07:40 UTCJul 4, 07:50 UTC10m
2026-07-03 SWR138 - Jul 3, 20:55 UTCJul 4, 06:00 UTC9h 5m
2026-07-03 SWR181 - Jul 3, 06:25 UTCJul 3, 17:35 UTC11h 10m
2026-07-02 SWR180 - Jul 2, 16:50 UTCJul 3, 03:05 UTC10h 15m
2026-07-02 SWR41G - Jul 2, 03:15 UTCJul 2, 13:10 UTC9h 55m
2026-07-01 SWR40 - Jul 1, 13:35 UTCJul 2, 00:55 UTC11h 20m
2026-06-30 SWR93 - Jun 30, 21:45 UTCJul 1, 08:50 UTC11h 5m
2026-06-29 SWR92 - Jun 29, 21:39 UTCJun 30, 08:55 UTC11h 15m
2026-06-29 SWR161 - Jun 29, 02:25 UTCJun 29, 16:29 UTC14h 5m
2026-06-28 SWR160 ZRH → NRT Jun 28, 12:05 UTCJun 29, 00:10 UTC12h 5m
2026-06-27 SWR139 - Jun 27, 18:24 UTCJun 28, 04:20 UTC9h 55m
2026-06-27 SWR139 - Jun 27, 16:00 UTCJun 27, 16:14 UTC15m
2026-06-27 SWR138 - Jun 27, 07:34 UTCJun 27, 08:10 UTC35m
2026-06-26 SWR138 - Jun 26, 20:50 UTCJun 27, 00:29 UTC3h 40m
2026-06-26 SWR41G - Jun 26, 03:00 UTCJun 26, 13:30 UTC10h 30m
2026-06-25 SWR40 - Jun 25, 12:15 UTCJun 25, 23:30 UTC11h 15m
2026-06-24 SWR93 - Jun 24, 22:14 UTCJun 25, 09:10 UTC10h 55m
2026-06-24 SWR93 - Jun 24, 16:54 UTCJun 24, 19:10 UTC2h 15m
2026-06-24 SWR92 - Jun 24, 12:20 UTCJun 24, 14:45 UTC2h 25m
2026-06-23 SWR92 - Jun 23, 21:10 UTCJun 24, 08:14 UTC11h 5m
2026-06-23 SWR161 - Jun 23, 02:29 UTCJun 23, 16:39 UTC14h 10m
2026-06-22 SWR160 - Jun 22, 11:35 UTCJun 22, 23:24 UTC11h 50m
2026-06-21 SWR139 - Jun 21, 18:54 UTCJun 22, 04:24 UTC9h 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-JNL page for operator, model, and routing details .

Mode-S 4B1921 frequently asked

What is Mode-S code 4B1921?
4B1921 is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-JNL.
Where is Mode-S 4B1921 registered?
Mode-S code 4B1921 is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B1921 broadcasting right now?
Yes. Mode-S 4B1921 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B1921, octal 22614441, decimal 4,921,633.
What flights does 4B1921 operate?
Mode-S 4B1921 has broadcast 20 distinct callsigns, including SWR93, SWR92, SWR40, SWR139, SWR138.