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DNS associates host names with their IP addresses. A complete domain name (that is, an FQDN) includes the name of the host concatenated with its domain name. This naming convention allows for a hierarchy of domain names with the host name being the most specific (and left-most) part.
The 255 address (in binary notation, a host address of all ones) is used to broadcast a message to every host on a network. Just remember that the first and last address in any network or subnet cannot be assigned to any individual host. You should now be able to give IP addresses to 254 hosts.he first part of an IP address is used as a network address, the last part as a host address. If you take the example 192.168.123.132 and divide it into these two parts you get the following: The second item, which is required for TCP/IP to work, is the subnet mask.