Apparatus

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sensors Mode-S transponder

4B1A1B

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-JXB · AIRBUS A-320

Hex
4B1A1B
Octal
22615033
Decimal
4,921,883
Country
CH
Tail
HB-JXB
Type
A320
Broadcasting now · callsign EJU34HV · 34,000 ft
Flights observed
485
Distinct callsigns
20
Country
CH
Last broadcast
1h ago

Current position

4B1A1B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4B1A1B 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
EJU85QE - 8 2026-07-11
EJU79CA - 8 2026-07-11
EZS72YG - 6 2026-07-11
EZS63WG - 6 2026-07-03
EZS62HY - 6 2026-06-30
EZS31QP - 6 2026-07-11
EZS17GH - 6 2026-07-03
EZS79YP - 5 2026-07-05
EZS75KZ Easyjet Switzerland 5 2026-06-16
EZS63BD - 5 2026-07-05
EZS48AX - 5 2026-06-30
EZS42JW Easyjet Switzerland 5 2026-07-02
EZS26DT Easyjet Switzerland 5 2026-06-16
EZS91YN - 4 2026-07-06
EZS91PX - 4 2026-07-14
EZS91HZ - 4 2026-06-30
EZS91DA - 4 2026-07-14
EZS81ZH - 4 2026-07-06
EZS69UH - 4 2026-07-06
EZS63KJ - 4 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 EJU1317 - Jul 15, 04:25 UTCJul 15, 06:35 UTC2h 10m
2026-07-14 EZS91PX CPH → GVA Jul 14, 19:20 UTCJul 14, 20:50 UTC1h 30m
2026-07-14 EZS41MU GVA → CPH Jul 14, 16:45 UTCJul 14, 18:20 UTC1h 35m
2026-07-14 EZS48DL - Jul 14, 14:40 UTCJul 14, 15:20 UTC40m
2026-07-14 EZS1397 - Jul 14, 12:40 UTCJul 14, 13:25 UTC45m
2026-07-14 EZS47HC - Jul 14, 10:20 UTCJul 14, 11:30 UTC1h 10m
2026-07-14 EZS91DA - Jul 14, 07:50 UTCJul 14, 08:55 UTC1h 5m
2026-07-14 EZS1386 - Jul 14, 05:55 UTCJul 14, 06:40 UTC45m
2026-07-14 EZS12VL GVA → NCE Jul 14, 04:20 UTCJul 14, 05:00 UTC40m
2026-07-13 EZS48NQ - Jul 13, 18:50 UTCJul 13, 20:50 UTC2h 0m
2026-07-13 EZS21WG - Jul 13, 15:55 UTCJul 13, 17:30 UTC1h 35m
2026-07-13 EZS49HP CPH → GVA Jul 13, 12:40 UTCJul 13, 14:20 UTC1h 40m
2026-07-13 EZS1537 - Jul 13, 10:10 UTCJul 13, 11:50 UTC1h 40m
2026-07-13 EZS51JQ LGW → GVA Jul 13, 07:55 UTCJul 13, 09:00 UTC1h 5m
2026-07-13 EZS51PA GVA → LGW Jul 13, 05:05 UTCJul 13, 06:15 UTC1h 10m
2026-07-12 EZS18GT BUD → GVA Jul 12, 18:45 UTCJul 12, 20:25 UTC1h 40m
2026-07-12 EZS83JY GVA → BUD Jul 12, 16:35 UTCJul 12, 18:01 UTC1h 25m
2026-07-12 EZS54RD OPO → GVA Jul 12, 13:45 UTCJul 12, 15:25 UTC1h 40m
2026-07-12 EZS74RG GVA → OPO Jul 12, 10:40 UTCJul 12, 12:45 UTC2h 5m
2026-07-12 EJU17TF SVQ → GVA Jul 12, 07:25 UTCJul 12, 09:15 UTC1h 50m
2026-07-12 EJU91PC GVA → SVQ Jul 12, 04:30 UTCJul 12, 06:40 UTC2h 10m
2026-07-11 - - Jul 11, 21:20 UTCJul 11, 21:30 UTC10m
2026-07-11 EJU79CA IBZ → GVA Jul 11, 19:40 UTCJul 11, 21:05 UTC1h 25m
2026-07-11 EJU85QE GVA → IBZ Jul 11, 17:15 UTCJul 11, 18:50 UTC1h 35m
2026-07-11 EZS32AW LGW → GVA Jul 11, 15:05 UTCJul 11, 16:15 UTC1h 10m
2026-07-11 EZS72YG GVA → LGW Jul 11, 12:20 UTCJul 11, 13:35 UTC1h 15m
2026-07-11 EZS31QP ATH → GVA Jul 11, 08:45 UTCJul 11, 11:10 UTC2h 25m
2026-07-11 EZS49KC - Jul 11, 05:15 UTCJul 11, 07:40 UTC2h 25m
2026-07-10 EJU79UM BCN → GVA Jul 10, 17:00 UTCJul 10, 18:10 UTC1h 10m
2026-07-10 EJU96NR - Jul 10, 13:25 UTCJul 10, 15:50 UTC2h 25m
2026-07-10 EJU76WF BCN → BFS Jul 10, 10:00 UTCJul 10, 12:20 UTC2h 20m
2026-07-10 EJU49XA - Jul 10, 07:15 UTCJul 10, 08:35 UTC1h 20m
2026-07-10 EJU62QN BCN → BSL Jul 10, 04:55 UTCJul 10, 06:15 UTC1h 20m
2026-07-09 EJU47PT GVA → BCN Jul 9, 20:00 UTCJul 9, 21:05 UTC1h 5m
2026-07-09 EZS83TQ - Jul 9, 17:35 UTCJul 9, 18:50 UTC1h 15m
2026-07-09 EZS58ZV - Jul 9, 15:35 UTCJul 9, 16:40 UTC1h 5m
2026-07-09 EZS48DL NCE → GVA Jul 9, 14:00 UTCJul 9, 14:45 UTC45m
2026-07-09 EZS1397 GVA → NCE Jul 9, 12:05 UTCJul 9, 12:50 UTC45m
2026-07-09 EZS54RD OPO → GVA Jul 9, 08:40 UTCJul 9, 10:30 UTC1h 50m
2026-07-09 EZS74RG GVA → OPO Jul 9, 05:45 UTCJul 9, 07:40 UTC1h 55m
2026-07-07 EZS87ML - Jul 7, 20:30 UTCJul 7, 22:05 UTC1h 35m
2026-07-07 EZS1435 - Jul 7, 18:00 UTCJul 7, 19:35 UTC1h 35m
2026-07-07 EZS24HA LUX → BER Jul 7, 15:00 UTCJul 7, 16:45 UTC1h 45m
2026-07-07 EZS32QW - Jul 7, 12:20 UTCJul 7, 14:00 UTC1h 40m
2026-07-07 EZS52HV GVA → GVA Jul 7, 04:25 UTCJul 7, 11:15 UTC6h 50m
2026-07-06 EZS78GR VLC → GVA Jul 6, 20:30 UTCJul 6, 22:00 UTC1h 30m
2026-07-06 EZS14EZ GVA → VLC Jul 6, 18:00 UTCJul 6, 19:30 UTC1h 30m
2026-07-06 EZS62GR OLB → GVA Jul 6, 16:00 UTCJul 6, 17:05 UTC1h 5m
2026-07-06 EZS91YN - Jul 6, 13:30 UTCJul 6, 14:35 UTC1h 5m
2026-07-06 EZS34AF PRG → GVA Jul 6, 11:10 UTCJul 6, 12:30 UTC1h 20m

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

Mode-S 4B1A1B frequently asked

What is Mode-S code 4B1A1B?
4B1A1B is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-JXB.
Where is Mode-S 4B1A1B registered?
Mode-S code 4B1A1B is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B1A1B broadcasting right now?
Yes. Mode-S 4B1A1B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B1A1B, octal 22615033, decimal 4,921,883.
What flights does 4B1A1B operate?
Mode-S 4B1A1B has broadcast 20 distinct callsigns, including EJU85QE, EJU79CA, EZS72YG, EZS63WG, EZS62HY.