Ip Address; Hostname - F-SECURE INTERNET GATEKEEPER WINDOWS 2000-2003 SERVER 6.61 Administrator's Manual

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B.4

IP Address

B.5

Hostname

Examples:
The subnet 192.168.0.0 with an implied netmask of 16 valid bits
(sometimes used in the netmask form 255.255.0.0)
192.168
The subnet 192.168.112.0/21 with a netmask of 21 valid bits (also
used in the netmask form 255.255.248.0)
192.168.112.0/21
A subnet with 32 valid bits is the equivalent to an IP address and a subnet
with zero valid bits (0.0.0.0/0) matches any IP address.
An IP address represents a fully qualified internet address in numeric
(dotted quad) form. Usually, this address represents a host, but the
address does not necessarily have to have a DNS domain name.
Example:
192.168.123.7
An IP address does not need to be resolved by the DNS system,
so it can result in more effective performance.
A hostname is a fully qualified DNS domain name, which can be resolved
to one or more IP addresses via the domain name service. It represents a
logical host (in contrast to domains) and it must be resolvable to at least
one IP address, or to a list of hosts with different IP addresses.
Examples
server.example.com
smtp.example.com