IPv4 Address Space

• 32-Bit Addresses => 4,294,967,296 Hosts

• Unusable areas have to be subtracted

  • Class D and E (Multicast and experimental),Null and Loopback Network, Private Addresses

• 3,706,650,624 usable Addresses

• H-Ratio (RFC 1715) predicts that only 200,000,000 Address will be usable due to insufficient address usage

  • DESY only uses 13,000 out of its 65,536 addresses