Is it possible to store visitors IPs in wp_postmeta table?

If it’s information that logically belongs to a post/page – you store it in postmeta (with update_post_meta function). If it’s something that pertains to a user – usermeta table is for you. More still, there’s Settings API in case you have a plugin that needs to persist any settings.

From your question it is somewhat unclear which of these would be best for you. What’s a “submission date“? The name and contact number, I’m guessing, are for a user, and so would belong in the usermeta. Function update_user_meta is a good place to start.

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