Apparatus

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sensors Mode-S transponder

4B1A27

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-JXN · AIRBUS A-320

Hex
4B1A27
Octal
22615047
Decimal
4,921,895
Country
CH
Tail
HB-JXN
Type
A320
Broadcasting now · callsign EZS63KJ · 23,000 ft
Flights observed
554
Distinct callsigns
20
Country
CH
Last broadcast
15m ago

Current position

4B1A27 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4B1A27 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
EZS43HQ - 10 2026-07-12
EZS34AF - 10 2026-07-12
EZS51BG - 7 2026-07-13
EZS84LU - 6 2026-06-24
EZS72YG - 6 2026-06-30
EZS53VN - 6 2026-07-13
EJU91PC - 6 2026-07-09
EJU42GT - 6 2026-07-03
EJU17TF - 6 2026-07-09
EZS82UP - 5 2026-07-04
EZS73RT - 5 2026-07-11
EZS68GV - 5 2026-06-27
EZS58KB - 5 2026-06-20
EZS52HV Easyjet Switzerland 5 2026-05-21
EZS42JW Easyjet Switzerland 5 2026-06-30
EZS31QP - 5 2026-07-09
EZS19WQ - 5 2026-07-11
EZS19CP - 5 2026-07-04
EZS14LH - 5 2026-06-26
EZS12XR - 5 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 EZS63KJ - Jul 15, 07:30 UTCJul 15, 07:45 UTC15m
2026-07-15 EZS48DL - Jul 15, 05:50 UTCJul 15, 06:30 UTC40m
2026-07-15 EZS1397 GVA → NCE Jul 15, 04:10 UTCJul 15, 04:50 UTC40m
2026-07-14 EZS59MQ LGW → GVA Jul 14, 20:45 UTCJul 14, 21:50 UTC1h 5m
2026-07-14 EZS23YH - Jul 14, 18:25 UTCJul 14, 19:35 UTC1h 10m
2026-07-14 EZS27QG - Jul 14, 16:35 UTCJul 14, 17:30 UTC55m
2026-07-14 EZS29UW - Jul 14, 14:30 UTCJul 14, 15:20 UTC50m
2026-07-14 EZS43JB RHO → GVA Jul 14, 10:10 UTCJul 14, 13:20 UTC3h 10m
2026-07-14 EZS62AV GVA → RHO Jul 14, 05:15 UTCJul 14, 07:55 UTC2h 40m
2026-07-13 EZS51BG - Jul 13, 20:05 UTCJul 13, 20:40 UTC35m
2026-07-13 EZS53VN - Jul 13, 18:30 UTCJul 13, 19:15 UTC45m
2026-07-13 EZS83TQ - Jul 13, 16:00 UTCJul 13, 17:10 UTC1h 10m
2026-07-13 EZS58ZV - Jul 13, 13:40 UTCJul 13, 14:45 UTC1h 5m
2026-07-13 EZS81AP - Jul 13, 11:40 UTCJul 13, 12:45 UTC1h 5m
2026-07-13 EZS79ER - Jul 13, 09:20 UTCJul 13, 10:30 UTC1h 10m
2026-07-13 EZS47HC - Jul 13, 06:45 UTCJul 13, 08:05 UTC1h 20m
2026-07-13 EZS91DA - Jul 13, 04:20 UTCJul 13, 05:25 UTC1h 5m
2026-07-12 EZS34AF - Jul 12, 20:25 UTCJul 12, 21:35 UTC1h 10m
2026-07-12 EZS43HQ GVA → PRG Jul 12, 18:10 UTCJul 12, 19:20 UTC1h 10m
2026-07-12 EZS75KZ TLS → GVA Jul 12, 16:15 UTCJul 12, 17:01 UTC45m
2026-07-12 EZS26DT GVA → TLS Jul 12, 14:30 UTCJul 12, 15:25 UTC55m
2026-07-12 EZS79KV - Jul 12, 12:30 UTCJul 12, 13:20 UTC50m
2026-07-12 EZS63KJ - Jul 12, 10:10 UTCJul 12, 11:05 UTC55m
2026-07-12 EZS48AX - Jul 12, 07:05 UTCJul 12, 09:00 UTC1h 55m
2026-07-12 EZS62HY - Jul 12, 04:20 UTCJul 12, 06:05 UTC1h 45m
2026-07-11 EZS73RT - Jul 11, 18:50 UTCJul 11, 20:40 UTC1h 50m
2026-07-11 EZS19WQ - Jul 11, 16:05 UTCJul 11, 17:45 UTC1h 40m
2026-07-11 EZS1506 AQJ → GVA Jul 11, 13:05 UTCJul 11, 14:55 UTC1h 50m
2026-07-11 EZS38RU GVA → DBV Jul 11, 10:40 UTCJul 11, 12:10 UTC1h 30m
2026-07-11 EZS87ML - Jul 11, 08:01 UTCJul 11, 09:35 UTC1h 35m
2026-07-11 EZS1435 - Jul 11, 05:25 UTCJul 11, 06:50 UTC1h 25m
2026-07-10 EZS75JQ - Jul 10, 18:50 UTCJul 10, 20:35 UTC1h 45m
2026-07-10 EZS78KD - Jul 10, 16:20 UTCJul 10, 17:55 UTC1h 35m
2026-07-10 EJU52WT - Jul 10, 13:20 UTCJul 10, 15:05 UTC1h 45m
2026-07-10 EJU82PN - Jul 10, 10:30 UTCJul 10, 12:25 UTC1h 55m
2026-07-10 EZS54RD OPO → GVA Jul 10, 07:20 UTCJul 10, 09:10 UTC1h 50m
2026-07-10 EZS74RG GVA → OPO Jul 10, 04:15 UTCJul 10, 06:10 UTC1h 55m
2026-07-09 EZS51BG NCE → GVA Jul 9, 19:40 UTCJul 9, 20:20 UTC40m
2026-07-09 EZS53VN GVA → NCE Jul 9, 18:05 UTCJul 9, 18:50 UTC45m
2026-07-09 EJU17TF SVQ → GVA Jul 9, 15:00 UTCJul 9, 17:00 UTC2h 0m
2026-07-09 EJU91PC GVA → SVQ Jul 9, 12:10 UTCJul 9, 14:10 UTC2h 0m
2026-07-09 EZS31QP ATH → GVA Jul 9, 08:35 UTCJul 9, 11:05 UTC2h 30m
2026-07-09 EZS49KC GVA → ATH Jul 9, 05:20 UTCJul 9, 07:35 UTC2h 15m
2026-07-08 EZS16MJ BOD → GVA Jul 8, 19:55 UTCJul 8, 20:55 UTC1h 0m
2026-07-08 EZS25BW GVA → BOD Jul 8, 18:05 UTCJul 8, 19:00 UTC55m
2026-07-08 EZS1386 - Jul 8, 16:15 UTCJul 8, 17:05 UTC50m
2026-07-08 EZS12VL GVA → NCE Jul 8, 14:30 UTCJul 8, 15:25 UTC55m
2026-07-08 EZS45GJ - Jul 8, 12:15 UTCJul 8, 13:05 UTC50m
2026-07-08 EZS49KR - Jul 8, 09:55 UTCJul 8, 10:40 UTC45m
2026-07-08 EZS48AX - Jul 8, 06:50 UTCJul 8, 08:40 UTC1h 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-JXN page for operator, model, and routing details .

Mode-S 4B1A27 frequently asked

What is Mode-S code 4B1A27?
4B1A27 is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-JXN.
Where is Mode-S 4B1A27 registered?
Mode-S code 4B1A27 is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B1A27 broadcasting right now?
Yes. Mode-S 4B1A27 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B1A27, octal 22615047, decimal 4,921,895.
What flights does 4B1A27 operate?
Mode-S 4B1A27 has broadcast 20 distinct callsigns, including EZS43HQ, EZS34AF, EZS51BG, EZS84LU, EZS72YG.