Where ever possible make sure to whitelist your IP (shown above) to ensure you do not get blocked.
If your IP has been blocked preventing you from accessing your control panel, webmail, FTP etc you can unblock your IP via your client portal.
If everyone else can see your website that's not on your local network your IP might be blocked. Contact support to get your IP unlocked.
Here you can convert unexpanded IPv6 addresses into the full expanded version.