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I am used to hide my ip using cloudflare so any hostadvice ip checkers show the ip of cloudflare . Any another ways to prevent ip leakage?
Don't point MX/other unnessecairy DNS records to your server. Use common sense.
Change your current main server IP if you have not done that already, because there are sites that keep historical records of domain's IPs (A records) and someone might look it up.