Info

Subnets 8 to 15

Subnets 8 to 15

Subnets 16 to 63

Subnets 16 to 63

Subnets 16 to 63

Subnets 16 to 63

All 0s and All 1s Addressing

In earlier versions of Windows, subnets using all 0s or all 1s were not allowed because early routers were not able to handle these addresses. Modern routers do not have a problem with this, so in Windows Server 2003, these special subnets are allowed in a classless environment. This change is in accordance with an Internet standard published through a technical specification called Request For Comment (RFC) 1812. RFCs are managed by the Internet Engineering Task Force (IETF).

RFC 1812 allows the use of all 0s and all 1s subnets in classless environments because routing protocols advertise the subnet mask with the network ID, which makes 129.17.0.0/19 distinguishable from 129.17.0.0/21.

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