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A Unix utility program, originally by Andrew Cherenson, for querying Internet domain name servers. The basic use is to find the IP address corresponding to a given hostname (or vice versa). By changing the query type (e.g. "set type=CNAME") other types of information can be obtained including CNAME - the canonical name for an alias; HINFO - the host CPU and operating system type; MINFO - mailbox or mail list information; MX - mail exchanger information; NS - the name server for the named zone; PTR - the hostname if the query is an IP address, otherwise the pointer to other information; SOA the domain's start-of-authority information; TXT - text information; UINFO - user information; WKS - supported well-known services. Other types (ANY, AXFR, MB, MD, MF, NULL) are described in RFC 1035.
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NSLOOKUP(Name Server LOOKUP) A utility program that displays the IP address of a hostname or the hostname of an IP address by querying the domain name system (DNS) server. Originating in the Unix world, there are NSLOOKUP programs for Windows and all operating systems that support IP networks. See IPCONFIG and DNS.
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