| http://www.w3.org/ns/prov#value | - A DNS (domain name system) server filter of the present invention checks the contents of a DNS packet before transmitting it to a DNS server in a network system including the DNS server for providing services of associating an IP address, a host name, and a domain name with each other using a DNS protocol defined by RFC (request for comments) 1034, 1035 and by an RFC document related to them and r
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