Apparatus

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sensors Mode-S transponder

4B1903

ICAO 24-bit transponder address · allocated to Switzerland

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

Hex
4B1903
Octal
22614403
Decimal
4,921,603
Country
CH
Tail
HB-JMH
Type
A343
No current signal · last broadcast Jul 26, 18:25 UTC
Flights observed
153
Distinct callsigns
20
Country
CH
Last broadcast
Jul 26, 18:25 UTC

Last known position

Most recent position reported by Mode-S 4B1903.

Country allocation

The ICAO 24-bit address 4B1903 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
SWR189 Swiss International Air Lines 32 2026-07-22
SWR283 Swiss International Air Lines 28 2026-07-26
SWR282 Swiss International Air Lines 28 2026-07-25
SWR188 Swiss International Air Lines 25 2026-07-22
SWR9G Swiss International Air Lines 10 2026-05-13
SWR8T Swiss International Air Lines 7 2026-05-12
SWR3YX Swiss International Air Lines 5 2026-07-25
SWR1CZ Swiss International Air Lines 5 2026-07-25
SWR52 Swiss International Air Lines 2 2026-05-23
SWR87F Swiss International Air Lines 1 2026-07-24
SWR7C Swiss International Air Lines 1 2026-04-20
SWR6A Swiss International Air Lines 1 2026-04-20
SWR5182 Swiss International Air Lines 1 2026-07-11
SWR5181 - 1 2026-07-17
SWR4Y Swiss International Air Lines 1 2026-05-23
SWR3WL Swiss International Air Lines 1 2026-05-25
SWR2647 - 1 2026-06-25
SWR2646 - 1 2026-06-25
SWR262C Swiss International Air Lines 1 2026-05-25
SWR1LE - 1 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWR283 JNB → ZRH Jul 26, 17:55 UTCJul 26, 18:25 UTC30m
2026-07-25 SWR282 ZRH → JNB Jul 25, 20:50 UTCJul 26, 06:55 UTC10h 6m
2026-07-25 SWR1CZ ALC → ZRH Jul 25, 15:10 UTCJul 25, 16:55 UTC1h 45m
2026-07-25 SWR3YX ZRH → ALC Jul 25, 11:10 UTCJul 25, 13:05 UTC1h 55m
2026-07-24 SWR87F YUL → ZRH Jul 24, 21:20 UTCJul 25, 04:10 UTC6h 50m
2026-07-24 SWR1LE ZRH → YUL Jul 24, 11:30 UTCJul 24, 19:15 UTC7h 45m
2026-07-22 SWR189 PVG → ZRH Jul 22, 21:05 UTCJul 23, 16:05 UTC19h 0m
2026-07-22 SWR189 PVG → ZRH Jul 22, 14:50 UTCJul 23, 14:45 UTC23h 55m
2026-07-22 SWR188 ZRH → PVG Jul 22, 12:50 UTCJul 23, 12:45 UTC23h 55m
2026-07-22 SWR188 ZRH → PVG Jul 22, 11:40 UTCJul 23, 04:40 UTC17h 0m
2026-07-21 SWR283 JNB → ZRH Jul 21, 18:05 UTCJul 22, 04:20 UTC10h 15m
2026-07-21 SWR282 ZRH → JNB Jul 21, 06:40 UTCJul 21, 07:20 UTC40m
2026-07-20 SWR282 ZRH → JNB Jul 20, 21:05 UTCJul 20, 22:30 UTC1h 25m
2026-07-19 SWR283 JNB → ZRH Jul 19, 18:10 UTCJul 20, 04:05 UTC9h 55m
2026-07-18 SWR282 ZRH → JNB Jul 18, 21:05 UTCJul 19, 07:10 UTC10h 5m
2026-07-18 SWR1CZ ALC → ZRH Jul 18, 15:40 UTCJul 18, 17:20 UTC1h 40m
2026-07-18 SWR3YX ZRH → ALC Jul 18, 12:05 UTCJul 18, 14:00 UTC1h 55m
2026-07-17 SWR5181 - Jul 17, 14:04 UTCJul 17, 15:00 UTC55m
2026-07-11 SWR5182 ZRH → BTS Jul 11, 18:50 UTCJul 11, 19:35 UTC45m
2026-07-11 SWR1CZ ALC → ZRH Jul 11, 14:45 UTCJul 11, 16:30 UTC1h 45m
2026-07-11 SWR3YX ZRH → ALC Jul 11, 11:10 UTCJul 11, 13:05 UTC1h 55m
2026-07-09 SWR283 QRA → ZRH Jul 9, 18:00 UTCJul 10, 04:15 UTC10h 15m
2026-07-08 SWR282 ZRH → JNB Jul 8, 20:55 UTCJul 9, 06:55 UTC10h 0m
2026-07-07 SWR283 - Jul 7, 18:00 UTCJul 8, 04:10 UTC10h 10m
2026-07-06 SWR282 - Jul 6, 20:55 UTCJul 7, 06:55 UTC10h 0m
2026-07-05 SWR283 - Jul 5, 18:10 UTCJul 6, 04:20 UTC10h 10m
2026-07-04 SWR282 - Jul 4, 20:55 UTCJul 5, 07:05 UTC10h 10m
2026-07-04 SWR1CZ ALC → ZRH Jul 4, 14:50 UTCJul 4, 16:35 UTC1h 45m
2026-07-04 SWR3YX ZRH → ALC Jul 4, 11:10 UTCJul 4, 13:00 UTC1h 50m
2026-07-01 SWR189 - Jul 1, 21:55 UTCJul 2, 16:00 UTC18h 5m
2026-07-01 SWR189 - Jul 1, 15:50 UTCJul 2, 14:45 UTC22h 55m
2026-07-01 SWR188 ZRH → PVG Jul 1, 12:50 UTCJul 2, 12:45 UTC23h 55m
2026-07-01 SWR188 ZRH → PVG Jul 1, 12:25 UTCJul 2, 03:35 UTC15h 10m
2026-06-30 SWR189 - Jun 30, 05:10 UTCJun 30, 16:50 UTC11h 40m
2026-06-29 SWR189 - Jun 29, 15:19 UTCJun 30, 14:05 UTC22h 45m
2026-06-29 SWR188 ZRH → PVG Jun 29, 12:49 UTCJun 30, 12:45 UTC23h 56m
2026-06-29 SWR188 ZRH → PVG Jun 29, 11:45 UTCJun 30, 05:30 UTC17h 46m
2026-06-27 SWR283 WKF → ZRH Jun 27, 17:59 UTCJun 28, 04:20 UTC10h 20m
2026-06-26 SWR282 - Jun 26, 20:59 UTCJun 27, 07:04 UTC10h 5m
2026-06-25 SWR2647 DEL → ZRH Jun 25, 21:29 UTCJun 26, 05:19 UTC7h 50m
2026-06-25 SWR2646 ZRH → DEL Jun 25, 11:50 UTCJun 25, 18:55 UTC7h 5m
2026-06-23 SWR283 - Jun 23, 18:04 UTCJun 24, 04:10 UTC10h 5m
2026-06-22 SWR282 ZRH → JNB Jun 22, 21:00 UTCJun 23, 07:40 UTC10h 40m
2026-06-21 SWR283 - Jun 21, 18:04 UTCJun 22, 04:09 UTC10h 5m
2026-06-20 SWR282 - Jun 20, 21:10 UTCJun 21, 07:25 UTC10h 15m
2026-06-20 SWR1CZ ALC → ZRH Jun 20, 14:54 UTCJun 20, 16:39 UTC1h 45m
2026-06-20 SWR3YX ZRH → ALC Jun 20, 11:09 UTCJun 20, 12:54 UTC1h 45m
2026-06-18 SWR189 PVG → ZRH Jun 18, 11:10 UTCJun 18, 15:35 UTC4h 25m
2026-06-17 SWR189 PVG → ZRH Jun 17, 14:50 UTCJun 18, 14:45 UTC23h 55m
2026-06-17 SWR188 ZRH → PVG Jun 17, 12:50 UTCJun 18, 12:35 UTC23h 45m

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

Mode-S 4B1903 frequently asked

What is Mode-S code 4B1903?
4B1903 is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-JMH.
Where is Mode-S 4B1903 registered?
Mode-S code 4B1903 is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B1903 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B1903, octal 22614403, decimal 4,921,603.
What flights does 4B1903 operate?
Mode-S 4B1903 has broadcast 20 distinct callsigns, including SWR189, SWR283, SWR282, SWR188, SWR9G.