Further reading
- RIPE Whois Database Query Reference Manual at http://www.ripe.net/ripe/docs/ripe-358
- dig (1) Linux man page at http://linux.die.net/man/1/dig
- Storing Certificates in the Domain Name System (DNS) at http://tools.ietf.org/html/rfc4398
- Domain Names – Implementation and Specification at http://www.ietf.org/rfc/rfc1035.txt
- Nmap Online Book at http://nmap.org/book/toc.html
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