About scopes and IP addresses
Scopes are logical groupings of IP addresses associated with a specific subnet mask. IP addresses are allocated from scopes when IP-based sites are created. Scopes and IP addresses are not used when name-based sites are created.
If a site that uses an IP address is removed, the IP address is placed at the end of the scope's available IP address list; it would be the last IP address in the scope to be assigned.
For additional information about scopes and IP addresses for IP-based sites, see:
Adding scopes
Adding IP addresses
Viewing scopes
Viewing IP addresses
Reserving IP addresses
Unreserving IP addresses
Removing IP addresses
Removing scopes
When you create a name-based site, an IP address is assigned to that site from the name-based IP address list in your system. For information about IP addresses used for name-based sites, see:
IP addresses for name-based sites
Adding IP addresses for name-based sites
Removing IP addresses from the name-based list