Specifying a Group of Network Host Computers

You can use wildcards to specify a group of network host computers.

• To assign an access control list to a group of network host computers, use the asterisk (*) wildcard character.

For example, enter *.example.com for host computers that belong to a domain or 192.0.2.* for IPv4 addresses that belong to an IP subnet. The asterisk wildcard must be at the beginning, before a period (.) in a domain, or at the end, after a period (.), in an IP subnet. For example, *.example.com is valid, but *example.com and *.example.* are not. Be aware that the use of wildcard characters affects the order of precedence for multiple access control lists that are assigned to the same host computer. You cannot use wildcard characters for IPv6 addresses.

The Classless Inter-Domain Routing (CIDR ) notation defines how IPv4 and IPv6 addresses are categorized for routing IP packets on the internet. The DBMS_NETWORK_ACL_ADMIN package supports CIDR notation for both IPv4 and IPv6 addresses. This package considers an IPv4-mapped IPv6 address or subnet equivalent to the IPv4-native address or subnet it represents. For example, ::ffff:192.0.2.1 is equivalent to 192.0.2.1, and ::ffff:192.0.2.1/120 is equivalent to 192.0.2.*.