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There are a number of basic network tools and utilities that are helpful in exposing, analyzing, and tracing spam messages and related materials. In these pages, I give some background info on these tools, tell where they can be obtained, and give examples of how they are used.
Here are the tools that I consider to be the most useful in working with spam:
|Find the IP address for a host name and vice-versa||host and nslookup|
|Find out whether a host is online|
|Trace the network route to a host||traceroute|
|Find info about the "owner" of an IP address.||whois [ip]|
|Find info about the "owner" of a domain name.||whois [domain]|
|Get detailed DNS info for a domain or host||dig|
|Download web pages (and other files) safely from a website||curl|
|Finding a spammer's upstream providers||find upstreams|