"Only by mastering the technologies that might be used against us can we defend ourselves."
-Cryptonomicon by Neal Stephenson

Networking

Securing Network Services and Infrastructure
Unofficial TEMPEST Info Page
Neohapsis Ports List - Comprehensive list of network ports and services
CheckURL.info url and TLD resource
Root DNS server status
Secrets of Network Cartography: A Comprehensive Guide to nmap - free online book about nmap, also covers basics of networking

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