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Learn about DNS, the phone book of the internet.

News/Follow-Ups – 01:57

• Distributed micro-blogging – Thimbl

Geek Tools – 04:56

• D-Link Pocket Router

Webapps – 07:20

• Wex – Dictionary of legal terms
• proCSSer – Process your CSS (via Philip Downer)

DNS – 14:02

• What it look like
  • jaderobbins.com translates to xxx.xxx.xxx.xxx ( kinda like a phone book)
    • You ask your DNS server if it knows jaderobbins.com
    • If it doesn’t know it, it then asks the top level dns server (.com, .net, etc)
    • They tell your dns the authoritative name server for that particular domain
    • Authoritative name server tells your dns that address is xxx.xxx.xxx.xxx
    • DNS tells you the correct address and caches
• DNS Records
  • A – Address – Hostname to IP
  • MX – Mail exchanger – Maps domain names to MTAs
  • NS – Name server – Delegates a DNS zone to use the given authoritative name servers
  • Full list
• Interesting things about DNS
  • Unicode characters are allowed
  • The full domain name cannot be longer that 253 characters.
  • 127 levels are allowed in a domain name.
  • Most widely distributed DNS server is BIND