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sensors Mode-S transponder

4B1904

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-JMI · AIRBUS A-340-300

Hex
4B1904
Octal
22614404
Decimal
4,921,604
Country
CH
Tail
HB-JMI
Type
A343
No current signal · last broadcast 5h ago
Flights observed
119
Distinct callsigns
8
Country
CH
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S 4B1904.

Country allocation

The ICAO 24-bit address 4B1904 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 8 distinct

Callsign Airline Flights Last seen
SWR283 - 32 2026-07-10
SWR282 - 31 2026-07-13
SWR189 - 28 2026-07-09
SWR188 Swiss International Air Lines 18 2026-07-08
SWR9G Swiss International Air Lines 3 2026-05-12
SWR8T Swiss International Air Lines 3 2026-05-11
SWR189D - 2 2026-07-12
SWR188D - 2 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 SWR282 - Jul 13, 20:50 UTCJul 14, 06:40 UTC9h 50m
2026-07-12 SWR189D - Jul 12, 21:45 UTCJul 13, 16:10 UTC18h 25m
2026-07-12 SWR189D - Jul 12, 15:45 UTCJul 13, 15:00 UTC23h 15m
2026-07-12 SWR188D - Jul 12, 13:05 UTCJul 13, 13:00 UTC23h 55m
2026-07-12 SWR188D - Jul 12, 12:25 UTCJul 13, 04:40 UTC16h 15m
2026-07-10 SWR283 - Jul 10, 17:50 UTCJul 11, 04:05 UTC10h 15m
2026-07-09 SWR282 ZRH → JNB Jul 9, 20:55 UTCJul 10, 07:00 UTC10h 5m
2026-07-09 SWR189 - Jul 9, 06:20 UTCJul 9, 17:35 UTC11h 15m
2026-07-08 SWR189 - Jul 8, 17:55 UTCJul 9, 17:00 UTC23h 5m
2026-07-08 SWR189 - Jul 8, 15:05 UTCJul 9, 14:40 UTC23h 35m
2026-07-08 SWR188 ZRH → PVG Jul 8, 11:30 UTCJul 9, 06:45 UTC19h 15m
2026-07-06 SWR283 - Jul 6, 18:05 UTCJul 7, 04:10 UTC10h 5m
2026-07-05 SWR282 - Jul 5, 21:00 UTCJul 6, 07:25 UTC10h 25m
2026-07-04 SWR283 - Jul 4, 18:05 UTCJul 5, 04:15 UTC10h 10m
2026-07-03 SWR282 - Jul 3, 21:00 UTCJul 4, 07:15 UTC10h 15m
2026-07-02 SWR283 - Jul 2, 18:00 UTCJul 3, 04:15 UTC10h 15m
2026-07-01 SWR282 - Jul 1, 21:05 UTCJul 2, 07:25 UTC10h 20m
2026-06-28 SWR283 - Jun 28, 17:50 UTCJun 29, 04:14 UTC10h 25m
2026-06-27 SWR282 - Jun 27, 20:59 UTCJun 28, 06:59 UTC10h 0m
2026-06-26 SWR283 - Jun 26, 18:09 UTCJun 27, 04:29 UTC10h 20m
2026-06-25 SWR282 - Jun 25, 20:59 UTCJun 26, 07:05 UTC10h 5m
2026-06-25 SWR189 - Jun 25, 03:50 UTCJun 25, 15:34 UTC11h 45m
2026-06-24 SWR189 - Jun 24, 15:14 UTCJun 25, 14:59 UTC23h 45m
2026-06-24 SWR188 ZRH → PVG Jun 24, 13:05 UTCJun 25, 12:44 UTC23h 40m
2026-06-24 SWR188 ZRH → PVG Jun 24, 11:54 UTCJun 25, 04:10 UTC16h 15m
2026-06-20 SWR283 - Jun 20, 17:49 UTCJun 21, 04:10 UTC10h 20m
2026-06-19 SWR282 - Jun 19, 21:49 UTCJun 20, 07:49 UTC10h 0m
2026-06-18 SWR283 - Jun 18, 17:55 UTCJun 19, 04:10 UTC10h 14m
2026-06-17 SWR282 - Jun 17, 20:55 UTCJun 18, 06:50 UTC9h 55m
2026-06-16 SWR189 PVG → ZRH Jun 16, 11:15 UTCJun 16, 15:50 UTC4h 35m
2026-06-15 SWR189 PVG → ZRH Jun 15, 18:45 UTCJun 16, 15:50 UTC21h 5m
2026-06-15 SWR189 PVG → ZRH Jun 15, 15:04 UTCJun 16, 15:00 UTC23h 55m
2026-06-15 SWR188 ZRH → PVG Jun 15, 13:05 UTCJun 16, 12:39 UTC23h 35m
2026-06-15 SWR188 ZRH → PVG Jun 15, 12:15 UTCJun 15, 18:45 UTC6h 30m
2026-06-13 SWR283 - Jun 13, 18:00 UTCJun 14, 04:10 UTC10h 10m
2026-06-12 SWR282 - Jun 12, 20:55 UTCJun 13, 06:55 UTC9h 59m
2026-06-10 SWR283 JNB → ZRH Jun 10, 17:55 UTCJun 11, 04:15 UTC10h 20m
2026-06-09 SWR282 ZRH → JNB Jun 9, 20:45 UTCJun 10, 06:50 UTC10h 5m
2026-06-09 SWR189 PVG → ZRH Jun 9, 04:00 UTCJun 9, 15:50 UTC11h 50m
2026-06-08 SWR189 PVG → ZRH Jun 8, 17:55 UTCJun 9, 15:50 UTC21h 55m
2026-06-08 SWR189 PVG → ZRH Jun 8, 15:20 UTCJun 9, 15:00 UTC23h 40m
2026-06-08 SWR189 PVG → ZRH Jun 8, 13:05 UTCJun 9, 12:50 UTC23h 45m
2026-06-08 SWR188 ZRH → PVG Jun 8, 11:15 UTCJun 9, 04:20 UTC17h 5m
2026-06-07 SWR189 PVG → ZRH Jun 7, 04:05 UTCJun 7, 16:00 UTC11h 55m
2026-06-06 SWR189 PVG → ZRH Jun 6, 18:25 UTCJun 7, 16:00 UTC21h 35m
2026-06-06 SWR189 PVG → ZRH Jun 6, 15:05 UTCJun 7, 15:00 UTC23h 55m
2026-06-06 SWR188 ZRH → PVG Jun 6, 13:05 UTCJun 7, 12:55 UTC23h 50m
2026-06-06 SWR188 ZRH → PVG Jun 6, 11:55 UTCJun 7, 04:25 UTC16h 30m
2026-06-03 SWR283 JNB → ZRH Jun 3, 18:00 UTCJun 4, 04:15 UTC10h 15m
2026-06-02 SWR282 ZRH → JNB Jun 2, 21:15 UTCJun 3, 07:10 UTC9h 55m

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

Mode-S 4B1904 frequently asked

What is Mode-S code 4B1904?
4B1904 is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-JMI.
Where is Mode-S 4B1904 registered?
Mode-S code 4B1904 is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B1904 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B1904, octal 22614404, decimal 4,921,604.
What flights does 4B1904 operate?
Mode-S 4B1904 has broadcast 8 distinct callsigns, including SWR283, SWR282, SWR189, SWR188, SWR9G.