Whois queries are used to determine the IP address ranges associated with clients. A whois query can be run on most UNIX environments. In a Windows environment, the tools such as WsPingPro and Sam Spade can be used to perform whois queries. Whois queries can also be executed over the Web from www.arin.net and www.networksolutions.com.

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Online Services

Gathering information: (set) http://www.subnetonline.com/ (set) http://ping.eu/ (ping, dns_tools, traceroute, web_tools) http://serversniff.net/ (DIG / nslookup, whois, traceroute) http://networking.ringofsaturn.com/Tools/ (whois, dns_tools, service_scan, traceroute) http://centralops.net/co/DomainDossier.aspx (whois, dns_tools, domain_search) http://www.whois.ws/ (whois, dns_tools) http://www.robtex.com/ (whois)