You can use the Active Directory Sites and Services snap-in to create new subnets.
Membership in the Enterprise Admins group in the forest or the Domain Admins group in the forest root domain, or equivalent, is the minimum required to complete this procedure. Review details about using the appropriate accounts and group memberships at
|To create a subnet|
Open Active Directory Sites and Services. To open Active Directory Sites and Services, click Start, click Administrative Tools, and then click Active Directory Sites and Services.
In the console tree, double-click Sites, right-click Subnets, and then click New Subnet.
In Prefix, type the IP version 4 (IPv4) or IP version 6 (IPv6) subnet prefix.
In Select a site object for this prefix, click the site to associate with this subnet, and then click OK.
To perform this procedure, you must be a member of the Enterprise Admins group in the forest or the Domain Admins group in the forest root domain, or you must have been delegated the appropriate authority. As a security best practice, use Run as administrator to perform this procedure. Log on with your lowest-level user account and use administrative credentials when you manage Active Directory Domain Services (AD DS).