Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4B1A23

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-JXJ · AIRBUS A-320

Hex
4B1A23
Octal
22615043
Decimal
4,921,891
Country
CH
Tail
HB-JXJ
Type
A320
No current signal · last broadcast 5h ago
Flights observed
229
Distinct callsigns
20
Country
CH
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S 4B1A23.

Country allocation

The ICAO 24-bit address 4B1A23 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
EZS735X Easyjet Switzerland 8 2026-05-19
EZS683R Easyjet Switzerland 8 2026-05-19
EZS35JU Easyjet Switzerland 5 2026-05-21
EZS46MW Easyjet Switzerland 4 2026-05-14
EZS27FR Easyjet Switzerland 4 2026-05-21
EZS9071 Easyjet Switzerland 3 2026-05-19
EZS72MD Easyjet Switzerland 3 2026-05-28
EZS61HE Easyjet Switzerland 3 2026-05-28
EZS45RN Easyjet Switzerland 3 2026-04-16
EZS37YZ - 3 2026-04-13
EZS34ML Easyjet Switzerland 3 2026-05-14
EZS31WH - 3 2026-05-14
EZS25QK Easyjet Switzerland 3 2026-05-28
EZS1523 - 3 2026-04-13
EJU43TE easyJet Europe 3 2026-05-27
EJU42GT easyJet Europe 3 2026-05-27
EZS94HE Easyjet Switzerland 2 2026-05-02
EZS91HZ Easyjet Switzerland 2 2026-05-21
EZS91GN Easyjet Switzerland 2 2026-05-04
EZS9072 Easyjet Switzerland 2 2026-05-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 EZS73GL - May 30, 13:10 UTCMay 30, 14:45 UTC1h 35m
2026-05-30 EJU9047 BSL → TLS May 30, 11:10 UTCMay 30, 11:55 UTC45m
2026-05-29 EJU67HR LIN → ORY May 29, 19:40 UTCMay 29, 20:40 UTC1h 0m
2026-05-29 EJU94UE ORY → LIN May 29, 17:30 UTCMay 29, 18:35 UTC1h 5m
2026-05-29 EJU9070 TLS → BSL May 29, 15:45 UTCMay 29, 16:25 UTC40m
2026-05-28 EZS89PM FCO → GVA May 28, 19:10 UTCMay 28, 20:25 UTC1h 15m
2026-05-28 EZS61HE GVA → FCO May 28, 16:55 UTCMay 28, 18:00 UTC1h 5m
2026-05-28 EZS24ZQ OPO → GVA May 28, 14:00 UTCMay 28, 15:50 UTC1h 50m
2026-05-28 EZS42WF GVA → OPO May 28, 10:45 UTCMay 28, 12:35 UTC1h 50m
2026-05-28 EZS72MD OPO → GVA May 28, 07:10 UTCMay 28, 09:00 UTC1h 50m
2026-05-28 EZS25QK GVA → OPO May 28, 04:15 UTCMay 28, 06:10 UTC1h 55m
2026-05-27 EZS35WT OPO → GVA May 27, 18:25 UTCMay 27, 20:15 UTC1h 50m
2026-05-27 EZS76KB GVA → OPO May 27, 15:25 UTCMay 27, 17:25 UTC2h 0m
2026-05-27 EJU43TE BCN → GVA May 27, 12:55 UTCMay 27, 14:05 UTC1h 10m
2026-05-27 EJU42GT GVA → BCN May 27, 10:40 UTCMay 27, 11:45 UTC1h 5m
2026-05-27 EJU95FD ALC → GVA May 27, 07:45 UTCMay 27, 09:25 UTC1h 40m
2026-05-27 EJU53LX GVA → ALC May 27, 04:19 UTCMay 27, 05:59 UTC1h 40m
2026-05-26 EJU79CA IBZ → GVA May 26, 19:20 UTCMay 26, 20:50 UTC1h 30m
2026-05-26 EJU85QE GVA → IBZ May 26, 16:55 UTCMay 26, 18:24 UTC1h 30m
2026-05-26 EZS48DL NCE → GVA May 26, 14:35 UTCMay 26, 15:14 UTC40m
2026-05-26 EZS1397 GVA → NCE May 26, 12:50 UTCMay 26, 13:40 UTC50m
2026-05-26 EZS68LG JTR → GVA May 26, 08:50 UTCMay 26, 11:20 UTC2h 30m
2026-05-26 EZS84CQ GVA → JTR May 26, 04:45 UTCMay 26, 07:34 UTC2h 50m
2026-05-25 EZS13PH LIL → GVA May 25, 19:54 UTCMay 25, 20:55 UTC1h 0m
2026-05-25 EZS49PV GVA → LIL May 25, 18:00 UTCMay 25, 18:55 UTC55m
2026-05-25 EZS81GY NAP → GVA May 25, 15:45 UTCMay 25, 17:05 UTC1h 20m
2026-05-25 EZS86DT GVA → NAP May 25, 13:10 UTCMay 25, 14:35 UTC1h 25m
2026-05-25 EZS59MN NCE → GVA May 25, 11:35 UTCMay 25, 12:20 UTC45m
2026-05-25 EZS1395 GVA → NCE May 25, 09:55 UTCMay 25, 10:40 UTC45m
2026-05-25 EJU95FD ALC → GVA May 25, 07:00 UTCMay 25, 08:45 UTC1h 45m
2026-05-25 EJU53LX GVA → ALC May 25, 04:15 UTCMay 25, 05:50 UTC1h 35m
2026-05-24 EZS91PX CPH → GVA May 24, 19:30 UTCMay 24, 21:15 UTC1h 45m
2026-05-24 EZS41MU GVA → CPH May 24, 16:50 UTCMay 24, 18:35 UTC1h 45m
2026-05-24 EZS54RD OPO → GVA May 24, 13:35 UTCMay 24, 15:30 UTC1h 55m
2026-05-24 EZS74RG GVA → OPO May 24, 10:40 UTCMay 24, 12:30 UTC1h 50m
2026-05-24 EJU17TF SVQ → GVA May 24, 07:25 UTCMay 24, 09:30 UTC2h 5m
2026-05-24 EJU91PC GVA → SVQ May 24, 04:30 UTCMay 24, 06:35 UTC2h 5m
2026-05-23 EZS75JQ BDS → GVA May 23, 19:25 UTCMay 23, 21:10 UTC1h 45m
2026-05-23 EZS78KD GVA → BDS May 23, 16:55 UTCMay 23, 18:35 UTC1h 41m
2026-05-23 EZS32AW LGW → GVA May 23, 14:55 UTCMay 23, 16:00 UTC1h 5m
2026-05-23 EZS72YG GVA → LGW May 23, 12:20 UTCMay 23, 13:35 UTC1h 15m
2026-05-23 EZS31QP ATH → GVA May 23, 08:35 UTCMay 23, 11:00 UTC2h 25m
2026-05-23 EZS68GV GVA → ATH May 23, 04:50 UTCMay 23, 07:15 UTC2h 25m
2026-05-22 EZS81AP OLB → GVA May 22, 19:45 UTCMay 22, 20:50 UTC1h 5m
2026-05-22 EZS79ER - May 22, 17:55 UTCMay 22, 18:55 UTC1h 0m
2026-05-22 EJU43TE BCN → GVA May 22, 15:50 UTCMay 22, 17:05 UTC1h 15m
2026-05-22 EJU42GT GVA → BCN May 22, 13:35 UTCMay 22, 14:40 UTC1h 5m
2026-05-22 EJU79CA IBZ → GVA May 22, 10:55 UTCMay 22, 12:30 UTC1h 35m
2026-05-22 EJU85QE - May 22, 08:25 UTCMay 22, 09:55 UTC1h 30m
2026-05-22 EZS59XA NCE → GVA May 22, 06:30 UTCMay 22, 07:15 UTC45m

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

Mode-S 4B1A23 frequently asked

What is Mode-S code 4B1A23?
4B1A23 is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-JXJ.
Where is Mode-S 4B1A23 registered?
Mode-S code 4B1A23 is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B1A23 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 4B1A23, octal 22615043, decimal 4,921,891.
What flights does 4B1A23 operate?
Mode-S 4B1A23 has broadcast 20 distinct callsigns, including EZS735X, EZS683R, EZS35JU, EZS46MW, EZS27FR.