The Structure of Domain Names

• Domain names are hierarchically composed

• Reading right to left

• • Top level domain (TLD)
  • • E.g., “com”
  • Second level domain
  • • E.g., “ebay”
  • And so on…
  • • E.g., “www”

• There are a limited number of TLDs

• • Generic
  • • .aero, .biz .com, .coop, .info, .museum, .name, .net, .org, .pro
  • Restricted
  • • .arpa, .edu, .gov, .mil, .int
  • Countries
  • • .us, .uk, .jp, .kr, .tv, etc.