Avoiding restricted subnets and IP addresses

Contents

Restricted subnets

You can’t use the following subnets when creating networks:

  • 224.0.0.0/4 – multicast
  • 240.0.0.0/4 – reserved
  • 127.0.0.0/8 – localhost
  • 169.254.0.0/16 – DHCP autoconfiguration
  • 0.0.0.0/8 – historical broadcast
  • 192.88.99.0/24 – anycast routing

In addition, avoid using any IP addresses or subnets that are accessible on the public Internet.

The following subnet ranges are designated as private address spaces, as defined in RFC 1918:

  • 10.0.0.0 - 10.255.255.255 (10/8 prefix)
  • 172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
  • 192.168.0.0 - 192.168.255.255 (192.168/16 prefix)

Notes

  • You must reserve one IP address for the Skytap subnet gateway in every automatic network. Skytap subnet gateways bind to the last usable address in the subnet when using automatic networks.
  • Skytap automatic networking automatically assigns IP addresses from the RFC 1918 private address space.
  • For more information, see the Wikipedia article on private networks.