limit depend on client version. If you using any newer client not supported by rathena (late 2018 and newer), you will get item id limit as 2147483648.
But if you want use old clients like supported in rathena you can get item id up to 65535.
i mean i just only want to know until how much i can add custom item sir ? is there any limitS? cause in rathena i add custom headgear for 32367 its ok but when i add 32368 to 32369 i can add , in game the item show and description there is no problem but if i worn it , there is no sprite show, ill check all my script, and also i try adding more to check it out ,same problem, maybe there is a limit of adding custom item, and now iwant here in hercules until how much really i can add custom items or equips?