Apparatus

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sensors Mode-S transponder

4B1A2B

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-JXR · AIRBUS A-320

Hex
4B1A2B
Octal
22615053
Decimal
4,921,899
Country
CH
Tail
HB-JXR
Type
A320
Broadcasting now · callsign EZS51PA · 35,925 ft
Flights observed
598
Distinct callsigns
20
Country
CH
Last broadcast
Jul 26, 21:10 UTC

Current position

4B1A2B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4B1A2B 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
EZS49JR - 10 2026-07-16
EZS72YG - 9 2026-07-21
EZS78GR - 8 2026-07-14
EZS62KF - 8 2026-07-14
EZS42JW Easyjet Switzerland 8 2026-07-21
EZS16QR - 8 2026-07-14
EZS14EZ - 8 2026-07-14
EJU42GT - 8 2026-06-24
EZS91HZ - 7 2026-07-16
EZS51PA - 7 2026-07-23
EJU43TE - 7 2026-06-24
EZS94ZT Easyjet Switzerland 6 2026-06-05
EZS81AP Easyjet Switzerland 6 2026-06-24
EZS62TJ - 6 2026-06-24
EZS62HY Easyjet Switzerland 6 2026-07-19
EZS58KB Easyjet Switzerland 6 2026-05-30
EZS51JQ - 6 2026-07-15
EZS48AX - 6 2026-07-19
EZS41MA - 6 2026-06-24
EZS91PX - 5 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 EZS59MQ LGW → GVA Jul 26, 20:10 UTCJul 26, 21:10 UTC1h 0m
2026-07-26 EZS23YH GVA → LGW Jul 26, 17:20 UTCJul 26, 18:45 UTC1h 25m
2026-07-26 EZS37UG AMS → GVA Jul 26, 14:40 UTCJul 26, 15:40 UTC1h 0m
2026-07-26 EZS1517 GVA → AMS Jul 26, 12:20 UTCJul 26, 13:35 UTC1h 15m
2026-07-25 EZS68CN - Jul 25, 17:20 UTCJul 25, 20:05 UTC2h 45m
2026-07-25 EZS73GL - Jul 25, 13:50 UTCJul 25, 16:15 UTC2h 25m
2026-07-25 EZS14VF LGW → GVA Jul 25, 11:20 UTCJul 25, 12:25 UTC1h 5m
2026-07-25 EZS91ZE GVA → LGW Jul 25, 08:35 UTCJul 25, 09:45 UTC1h 10m
2026-07-25 EZS59XA NCE → GVA Jul 25, 06:55 UTCJul 25, 07:35 UTC40m
2026-07-25 EZS354V BSL → NCE Jul 25, 04:55 UTCJul 25, 05:50 UTC55m
2026-07-24 EJU36DT - Jul 24, 18:35 UTCJul 24, 20:30 UTC1h 55m
2026-07-24 EJU49VB BSL → SCQ Jul 24, 15:20 UTCJul 24, 17:25 UTC2h 5m
2026-07-24 EJU85DP IBZ → BSL Jul 24, 12:35 UTCJul 24, 14:10 UTC1h 35m
2026-07-24 EJU85HR BSL → IBZ Jul 24, 09:50 UTCJul 24, 11:25 UTC1h 35m
2026-07-24 EZS78RY SPU → BSL Jul 24, 07:30 UTCJul 24, 08:45 UTC1h 15m
2026-07-24 EZS69AF BSL → SPU Jul 24, 05:05 UTCJul 24, 06:05 UTC1h 0m
2026-07-23 EJU85DP IBZ → BSL Jul 23, 17:55 UTCJul 23, 19:40 UTC1h 45m
2026-07-23 EJU85HR BSL → IBZ Jul 23, 15:20 UTCJul 23, 16:55 UTC1h 35m
2026-07-23 EJU79WZ PMI → BSL Jul 23, 12:50 UTCJul 23, 14:25 UTC1h 35m
2026-07-23 EJU48PU - Jul 23, 10:05 UTCJul 23, 11:30 UTC1h 25m
2026-07-23 EZS68GC LGW → BSL Jul 23, 08:05 UTCJul 23, 09:20 UTC1h 15m
2026-07-23 EZS51PA GVA → LGW Jul 23, 05:00 UTCJul 23, 06:15 UTC1h 15m
2026-07-22 EZS81ZH TLS → GVA Jul 22, 20:30 UTCJul 22, 21:20 UTC50m
2026-07-22 EZS69UH GVA → TLS Jul 22, 18:55 UTCJul 22, 19:50 UTC55m
2026-07-22 EJU13UC BCN → GVA Jul 22, 16:40 UTCJul 22, 17:55 UTC1h 15m
2026-07-22 EJU7108 GVA → BCN Jul 22, 14:15 UTCJul 22, 15:30 UTC1h 15m
2026-07-22 EZS31QP - Jul 22, 11:10 UTCJul 22, 13:10 UTC2h 0m
2026-07-22 EZS49KC - Jul 22, 05:05 UTCJul 22, 05:25 UTC20m
2026-07-21 EZS25WG MLA → GVA Jul 21, 19:25 UTCJul 21, 21:35 UTC2h 10m
2026-07-21 EZS1573 GVA → MLA Jul 21, 16:50 UTCJul 21, 18:35 UTC1h 45m
2026-07-21 EZS42JW LGW → GVA Jul 21, 14:45 UTCJul 21, 15:50 UTC1h 5m
2026-07-21 EZS72YG GVA → LGW Jul 21, 12:10 UTCJul 21, 13:25 UTC1h 15m
2026-07-21 EZS82UP - Jul 21, 08:55 UTCJul 21, 10:55 UTC2h 0m
2026-07-21 EZS19CP GVA → CFU Jul 21, 05:45 UTCJul 21, 07:20 UTC1h 35m
2026-07-20 EZS68CN JMK → GVA Jul 20, 17:55 UTCJul 20, 20:45 UTC2h 50m
2026-07-20 EZS73GL GVA → JMK Jul 20, 14:40 UTCJul 20, 17:00 UTC2h 20m
2026-07-20 EZS18FL - Jul 20, 11:55 UTCJul 20, 12:55 UTC1h 0m
2026-07-20 EZS1343 - Jul 20, 10:05 UTCJul 20, 11:05 UTC1h 0m
2026-07-20 EJU95FD - Jul 20, 07:20 UTCJul 20, 09:00 UTC1h 40m
2026-07-20 EJU53LX GVA → ALC Jul 20, 04:45 UTCJul 20, 06:25 UTC1h 40m
2026-07-19 EZS79KV - Jul 19, 12:00 UTCJul 19, 13:00 UTC1h 0m
2026-07-19 EZS63KJ GVA → VCE Jul 19, 10:00 UTCJul 19, 10:50 UTC50m
2026-07-19 EZS48AX - Jul 19, 07:10 UTCJul 19, 09:05 UTC1h 55m
2026-07-19 EZS62HY PRG → BSL Jul 19, 04:20 UTCJul 19, 05:55 UTC1h 35m
2026-07-18 EJU85PK - Jul 18, 19:40 UTCJul 18, 21:15 UTC1h 35m
2026-07-18 EJU81HV - Jul 18, 16:35 UTCJul 18, 18:15 UTC1h 40m
2026-07-18 EZS1510 - Jul 18, 14:25 UTCJul 18, 15:35 UTC1h 10m
2026-07-18 EZS1509 - Jul 18, 12:05 UTCJul 18, 13:10 UTC1h 5m
2026-07-18 EZS59MN NCE → GVA Jul 18, 10:10 UTCJul 18, 10:50 UTC40m
2026-07-18 EZS1395 GVA → NCE Jul 18, 08:10 UTCJul 18, 08:45 UTC35m

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

Mode-S 4B1A2B frequently asked

What is Mode-S code 4B1A2B?
4B1A2B is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-JXR.
Where is Mode-S 4B1A2B registered?
Mode-S code 4B1A2B is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B1A2B broadcasting right now?
Yes. Mode-S 4B1A2B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B1A2B, octal 22615053, decimal 4,921,899.
What flights does 4B1A2B operate?
Mode-S 4B1A2B has broadcast 20 distinct callsigns, including EZS49JR, EZS72YG, EZS78GR, EZS62KF, EZS42JW.