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 8h ago
Flights observed
79
Distinct callsigns
12
Country
CH
Last broadcast
8h ago

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 12 distinct

Callsign Airline Flights Last seen
SWR189 Swiss International Air Lines 19 2026-05-17
SWR188 Swiss International Air Lines 13 2026-05-16
SWR283 Swiss International Air Lines 12 2026-05-29
SWR282 Swiss International Air Lines 11 2026-05-28
SWR9G Swiss International Air Lines 10 2026-05-13
SWR8T Swiss International Air Lines 7 2026-05-12
SWR52 Swiss International Air Lines 2 2026-05-23
SWR7C Swiss International Air Lines 1 2026-04-20
SWR6A Swiss International Air Lines 1 2026-04-20
SWR4Y Swiss International Air Lines 1 2026-05-23
SWR3WL Swiss International Air Lines 1 2026-05-25
SWR262C Swiss International Air Lines 1 2026-05-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 SWR283 JNB → ZRH May 29, 17:55 UTCMay 29, 18:25 UTC30m
2026-05-28 SWR282 ZRH → JNB May 28, 20:45 UTCMay 29, 07:00 UTC10h 15m
2026-05-27 SWR283 JNB → ZRH May 27, 18:00 UTCMay 28, 04:05 UTC10h 5m
2026-05-26 SWR282 ZRH → JNB May 26, 20:50 UTCMay 27, 07:05 UTC10h 15m
2026-05-25 SWR262C AGP → ZRH May 25, 15:15 UTCMay 25, 17:25 UTC2h 10m
2026-05-25 SWR3WL ZRH → ZRH May 25, 11:40 UTCMay 25, 13:45 UTC2h 5m
2026-05-24 SWR283 JNB → ZRH May 24, 17:55 UTCMay 25, 04:15 UTC10h 20m
2026-05-23 SWR282 ZRH → JNB May 23, 20:55 UTCMay 24, 07:00 UTC10h 5m
2026-05-23 SWR4Y BOS → ZRH May 23, 04:45 UTCMay 23, 11:15 UTC6h 30m
2026-05-23 SWR52 ZRH → BOS May 23, 01:30 UTCMay 23, 02:35 UTC1h 5m
2026-05-22 SWR52 ZRH → BOS May 22, 19:05 UTCMay 23, 01:25 UTC6h 20m
2026-05-18 SWR283 JNB → ZRH May 18, 17:40 UTCMay 19, 04:15 UTC10h 34m
2026-05-17 SWR282 ZRH → JNB May 17, 20:40 UTCMay 18, 06:50 UTC10h 10m
2026-05-17 SWR189 PVG → ZRH May 17, 08:25 UTCMay 17, 15:50 UTC7h 25m
2026-05-16 SWR189 PVG → ZRH May 16, 18:40 UTCMay 17, 15:50 UTC21h 10m
2026-05-16 SWR189 PVG → ZRH May 16, 14:51 UTCMay 17, 14:45 UTC23h 55m
2026-05-16 SWR188 ZRH → PVG May 16, 12:50 UTCMay 17, 12:45 UTC23h 55m
2026-05-16 SWR188 ZRH → PVG May 16, 11:51 UTCMay 17, 08:25 UTC20h 35m
2026-05-14 SWR189 PVG → ZRH May 14, 08:10 UTCMay 14, 15:45 UTC7h 35m
2026-05-13 SWR189 PVG → ZRH May 13, 18:15 UTCMay 14, 15:45 UTC21h 30m
2026-05-13 SWR189 PVG → ZRH May 13, 12:50 UTCMay 14, 12:45 UTC23h 55m
2026-05-13 SWR188 ZRH → PVG May 13, 11:30 UTCMay 14, 08:10 UTC20h 40m
2026-05-13 SWR9G ORD → ZRH May 13, 00:40 UTCMay 13, 08:50 UTC8h 10m
2026-05-12 SWR8T ZRH → ORD May 12, 11:55 UTCMay 12, 22:01 UTC10h 5m
2026-05-11 SWR283 JNB → ZRH May 11, 18:10 UTCMay 12, 04:20 UTC10h 10m
2026-05-10 SWR282 ZRH → JNB May 10, 20:50 UTCMay 11, 06:45 UTC9h 55m
2026-05-10 SWR189 PVG → ZRH May 10, 11:55 UTCMay 10, 16:20 UTC4h 25m
2026-05-09 SWR189 PVG → ZRH May 9, 15:25 UTCMay 10, 14:45 UTC23h 20m
2026-05-09 SWR188 ZRH → PVG May 9, 12:50 UTCMay 10, 12:44 UTC23h 55m
2026-05-09 SWR188 ZRH → PVG May 9, 12:25 UTCMay 9, 16:15 UTC3h 50m
2026-05-08 SWR9G ORD → ZRH May 8, 00:34 UTCMay 8, 08:29 UTC7h 55m
2026-05-07 SWR8T ZRH → ORD May 7, 11:35 UTCMay 7, 21:00 UTC9h 25m
2026-05-07 SWR9G ORD → ZRH May 7, 01:00 UTCMay 7, 09:05 UTC8h 5m
2026-05-06 SWR8T ZRH → ORD May 6, 11:35 UTCMay 6, 21:10 UTC9h 34m
2026-05-06 SWR9G ORD → ZRH May 6, 00:35 UTCMay 6, 08:45 UTC8h 10m
2026-05-05 SWR8T ZRH → ORD May 5, 11:55 UTCMay 5, 21:01 UTC9h 5m
2026-05-04 SWR283 JNB → ZRH May 4, 17:45 UTCMay 5, 04:10 UTC10h 26m
2026-05-03 SWR282 ZRH → JNB May 3, 20:55 UTCMay 4, 07:10 UTC10h 15m
2026-05-03 SWR189 PVG → ZRH May 3, 03:45 UTCMay 3, 15:15 UTC11h 30m
2026-05-02 SWR189 PVG → ZRH May 2, 18:05 UTCMay 3, 15:15 UTC21h 9m
2026-05-02 SWR189 PVG → ZRH May 2, 14:50 UTCMay 3, 14:45 UTC23h 54m
2026-05-02 SWR189 PVG → ZRH May 2, 12:50 UTCMay 3, 12:25 UTC23h 34m
2026-05-02 SWR188 ZRH → PVG May 2, 11:20 UTCMay 3, 07:50 UTC20h 29m
2026-05-02 SWR9G ORD → ZRH May 2, 00:35 UTCMay 2, 08:50 UTC8h 15m
2026-05-01 SWR8T ZRH → ORD May 1, 11:40 UTCMay 1, 20:45 UTC9h 5m
2026-05-01 SWR9G ORD → ZRH May 1, 00:30 UTCMay 1, 09:00 UTC8h 31m
2026-04-30 SWR8T ZRH → ORD Apr 30, 12:00 UTCApr 30, 20:50 UTC8h 50m
2026-04-29 SWR283 JNB → ZRH Apr 29, 17:45 UTCApr 30, 04:10 UTC10h 24m
2026-04-28 SWR282 ZRH → JNB Apr 28, 20:50 UTCApr 29, 07:05 UTC10h 15m
2026-04-28 SWR189 PVG → ZRH Apr 28, 04:10 UTCApr 28, 16:00 UTC11h 50m

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 8h ago.
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 12 distinct callsigns, including SWR189, SWR188, SWR283, SWR282, SWR9G.