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Knowledge Base > Domain Blocking
Domains that may not be blocked with OpenDNS domain blocking
Domains that may not be blocked with the OpenDNS Basic service:
1. opendns.com - Otherwise you couldn't change your preferences.
2. .com - Same reason; you may block other TLDs (top level domains) if you choose.
3. overture.com - OpenDNS is a free service. OpenDNS makes money from advertising and we do not allow our ad server to be blocked.
4. yahoo.com - OpenDNS's search results are returned from Yahoo.com. You may block subdomains if you choose, such as mail.yahoo.com.
Note: The above rules, with the exception of blocking opendns.com, apply only to the free Basic service. For more information on the Deluxe and Enterprise services see http://www.opendns.com/start/
Updated: October, 2009
Keywords: domain, block, blocking, subdomain
