Apparatus

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sensors Mode-S transponder

4B1A37

ICAO 24-bit transponder address · allocated to Switzerland

Currently assigned to HB-JYD · AIRBUS A-320

Hex
4B1A37
Octal
22615067
Decimal
4,921,911
Country
CH
Tail
HB-JYD
Type
A320
No current signal · last broadcast Jul 26, 21:05 UTC
Flights observed
560
Distinct callsigns
20
Country
CH
Last broadcast
Jul 26, 21:05 UTC

Last known position

Most recent position reported by Mode-S 4B1A37.

Country allocation

The ICAO 24-bit address 4B1A37 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
EZS25QK Easyjet Switzerland 6 2026-07-21
EZS78GR Easyjet Switzerland 5 2026-07-21
EZS73RT Easyjet Switzerland 5 2026-07-19
EZS51BG Easyjet Switzerland 5 2026-07-23
EZS19WQ - 5 2026-07-19
EZS14EZ - 5 2026-07-21
EJU85QE - 5 2026-07-08
EJU82PN - 5 2026-07-11
EZS76KB Easyjet Switzerland 4 2026-06-27
EZS74RG Easyjet Switzerland 4 2026-06-15
EZS72MD - 4 2026-07-21
EZS62KF - 4 2026-07-17
EZS53VN - 4 2026-07-23
EZS31QP Easyjet Switzerland 4 2026-07-23
EZS1395 Easyjet Switzerland 4 2026-07-20
EJU91HD easyJet Europe 4 2026-05-12
EJU81AT easyJet Europe 4 2026-05-12
EJU79CA - 4 2026-07-08
EJU62BJ easyJet Europe 4 2026-05-12
EJU52WT - 4 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 EZS1510 SPU → GVA Jul 26, 19:55 UTCJul 26, 21:05 UTC1h 10m
2026-07-26 EZS1509 GVA → DBV Jul 26, 16:55 UTCJul 26, 18:05 UTC1h 10m
2026-07-26 EZS48YR - Jul 26, 11:15 UTCJul 26, 15:45 UTC4h 30m
2026-07-26 EZS81DV - Jul 26, 08:20 UTCJul 26, 10:00 UTC1h 40m
2026-07-26 EZS12DC GVA → NBE Jul 26, 05:25 UTCJul 26, 06:55 UTC1h 31m
2026-07-25 EZS25WG MLA → GVA Jul 25, 19:15 UTCJul 25, 21:20 UTC2h 5m
2026-07-25 EZS1573 GVA → MLA Jul 25, 16:20 UTCJul 25, 18:10 UTC1h 50m
2026-07-25 EZS48YR - Jul 25, 10:35 UTCJul 25, 15:20 UTC4h 45m
2026-07-25 EZS1354 CLY → GVA Jul 25, 07:00 UTCJul 25, 07:55 UTC55m
2026-07-25 EZS65JT GVA → CLY Jul 25, 05:05 UTCJul 25, 05:55 UTC50m
2026-07-24 EZS18GT BUD → GVA Jul 24, 19:10 UTCJul 24, 20:45 UTC1h 35m
2026-07-24 EZS83JY GVA → BUD Jul 24, 16:50 UTCJul 24, 18:20 UTC1h 30m
2026-07-24 EZS75NE RNS → GVA Jul 24, 14:40 UTCJul 24, 15:50 UTC1h 10m
2026-07-24 EZS83YJ GVA → RNS Jul 24, 12:45 UTCJul 24, 13:55 UTC1h 10m
2026-07-24 EZS84LU BOD → GVA Jul 24, 10:40 UTCJul 24, 11:35 UTC55m
2026-07-24 EZS46NT GVA → BOD Jul 24, 08:35 UTCJul 24, 09:45 UTC1h 10m
2026-07-24 EZS59XA NCE → GVA Jul 24, 06:15 UTCJul 24, 07:00 UTC45m
2026-07-24 EZS71RV GVA → NCE Jul 24, 04:20 UTCJul 24, 05:00 UTC40m
2026-07-23 EZS51BG NCE → GVA Jul 23, 19:50 UTCJul 23, 20:35 UTC45m
2026-07-23 EZS53VN GVA → NCE Jul 23, 18:10 UTCJul 23, 18:50 UTC40m
2026-07-23 EJU17TF SVQ → GVA Jul 23, 15:10 UTCJul 23, 17:00 UTC1h 50m
2026-07-23 EJU91PC GVA → SVQ Jul 23, 12:10 UTCJul 23, 14:10 UTC2h 0m
2026-07-23 EZS31QP ATH → GVA Jul 23, 08:25 UTCJul 23, 11:10 UTC2h 45m
2026-07-23 EZS49KC GVA → ATH Jul 23, 04:50 UTCJul 23, 07:10 UTC2h 20m
2026-07-22 EZS16MJ BOD → GVA Jul 22, 18:55 UTCJul 22, 19:45 UTC50m
2026-07-22 EZS25BW GVA → BOD Jul 22, 17:05 UTCJul 22, 18:05 UTC1h 0m
2026-07-22 EZS59GQ - Jul 22, 15:00 UTCJul 22, 16:00 UTC1h 0m
2026-07-22 EZS32GV - Jul 22, 13:15 UTCJul 22, 14:05 UTC50m
2026-07-22 EZS84LU BOD → GVA Jul 22, 11:20 UTCJul 22, 12:10 UTC50m
2026-07-22 EZS86DT GVA → NAP Jul 22, 04:20 UTCJul 22, 05:25 UTC1h 5m
2026-07-21 EZS78GR VLC → GVA Jul 21, 19:30 UTCJul 21, 21:00 UTC1h 30m
2026-07-21 EZS14EZ GVA → VLC Jul 21, 16:40 UTCJul 21, 18:10 UTC1h 30m
2026-07-21 EZS1536 - Jul 21, 13:45 UTCJul 21, 15:40 UTC1h 55m
2026-07-21 EZS1535 - Jul 21, 10:55 UTCJul 21, 12:40 UTC1h 45m
2026-07-21 EZS72MD OPO → GVA Jul 21, 07:20 UTCJul 21, 09:05 UTC1h 45m
2026-07-21 EZS25QK GVA → OPO Jul 21, 04:15 UTCJul 21, 06:25 UTC2h 10m
2026-07-20 EZS81GY - Jul 20, 20:10 UTCJul 20, 21:35 UTC1h 25m
2026-07-20 EZS86DT - Jul 20, 17:40 UTCJul 20, 18:55 UTC1h 15m
2026-07-20 EZS47XZ - Jul 20, 15:35 UTCJul 20, 16:35 UTC1h 0m
2026-07-20 EZS72QV - Jul 20, 13:20 UTCJul 20, 14:20 UTC1h 0m
2026-07-20 EZS59MN NCE → GVA Jul 20, 11:30 UTCJul 20, 12:10 UTC40m
2026-07-20 EZS1395 GVA → NCE Jul 20, 09:40 UTCJul 20, 10:25 UTC45m
2026-07-20 EZS43MP BRU → GVA Jul 20, 07:25 UTCJul 20, 08:30 UTC1h 5m
2026-07-20 EZS1527 GVA → BRU Jul 20, 05:35 UTCJul 20, 06:35 UTC1h 0m
2026-07-19 EZS73RT PRN → GVA Jul 19, 18:55 UTCJul 19, 20:45 UTC1h 50m
2026-07-19 EZS19WQ - Jul 19, 16:05 UTCJul 19, 17:40 UTC1h 35m
2026-07-19 EZS63BD LIS → GVA Jul 19, 12:25 UTCJul 19, 14:15 UTC1h 50m
2026-07-19 EZS79YP - Jul 19, 08:40 UTCJul 19, 10:55 UTC2h 15m
2026-07-19 EZS47HC - Jul 19, 06:20 UTCJul 19, 07:35 UTC1h 15m
2026-07-19 EZS91DA GVA → SPU Jul 19, 04:00 UTCJul 19, 05:05 UTC1h 5m

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

Mode-S 4B1A37 frequently asked

What is Mode-S code 4B1A37?
4B1A37 is an ICAO 24-bit transponder address. Allocated to Switzerland. Assigned to HB-JYD.
Where is Mode-S 4B1A37 registered?
Mode-S code 4B1A37 is allocated to Switzerland (CH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4B1A37 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4B1A37, octal 22615067, decimal 4,921,911.
What flights does 4B1A37 operate?
Mode-S 4B1A37 has broadcast 20 distinct callsigns, including EZS25QK, EZS78GR, EZS73RT, EZS51BG, EZS19WQ.