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IE URL Lock
Used to prevent users from accessing sites via IP address directly
Note: A better method over IE URL Lock (which only works for IE) is to perform "IP in URL blocking" via your firewall/router (see FAQ 115) which would apply regardless of browser.
After installation: Start > Run > gpedit.msc
Local Computer Policy
IE URL Lock
If you don't see it, right-click > Add/Remove Templates... > Add...
Look in "C:\Program Files\IE URL Lock" or "C:\Windows\inf" and select "IEURLLock.adm" > Open
Configure options per below...
Windows XP or similar depicted, see Windows 7 instead?
In [Paste A] put: http://blocked.example.com/visit-by-ip-not-allowed (use the DNS record that resolves to your BlockedIP= site via SimpleDNS)
or: http://block.opendns.com (if you are using OpenDNS as your upstream DNS provider)
or: about:blank (if you just want to show a blank page)
In [Paste B] put: ^http(s)?://\d+\.\d+\.\d+\.\d+(/|$)
If you also want to block IPv6 addresses, on the next line, Add... ^http(s)?://.*:.*:.*:.*(/|$)
Open Internet Explorer, if prompted allow the BHO (Browser Helper Object)
In some cases it may be necessary to open and close IE twice before these settings take effect.