IP addresses

• Logical address at network layer
• Two parts: Network number, Host number
• Dotted decimal notation
• 144.16.111.2 (Class B)
• 202.54.44.120 (Class C)
• Special Conventions
  • All 0s - this host
  • All 1s - limited broadcast (localnet)
• Machines on the same "network" have same "network" number (PIN code)
• One address per interface (not machine)
• Useful for "routing"