21.3.2. Hostname Formats
21.3.2. Hostname Formats The host(s) can be in the following forms: Single machine - A fully qualified domain name (that can be resolved by the server), hostname (that can be resolved by the server), or an IP address. Series of machines specified with wildcards - Use the * or ? character to specify a string match. Wildcards are not to be used with IP addresses; however, they may accidentally work if reverse DNS lookups fail. When specifying wildcards in fully qualified domain names, dots (.) are not included in the wildcard. For example, *.example.com includes one.example.com but does not include one.two.example.com. IP networks - Use a.b.c.d/z , where a.b.c.d is the network and z is the number of bits in the netmask (for example 192.168.0.0/24). Another acceptable format is a.b.c.d/netmask , where a.b.c.d is the network and netmask is the netmask (for example, 192.168.100.8/255.255.255.0). Netgroups - In the format @group-name , where group-name is the NIS netgroup name.