Dr. A's Examples
(some of these are Linux, others are Windows)
NetCat
nc -v www.scotnpatti.com 80 HEAD / HTTP/1.0 (press enter) (press enter)
FTP
www.scotnpatti.com (bad) www.cs.southern.edu (good)
SMTP
telnet email.scotnpatti.com vrfy root vrfy scot vrfy jane
DNS
dig @peter.cs.andrews.edu southern.edu axfr
BindVersion
dig @ns1.swau.edu version.bind txt chaos
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