Domain-name system (DNS) suffixes have the following two primary purposes:
- When appended to the server host name, DNS suffixes constitute the fully qualified server name.
- DNS suffixes are used to resolve Internet Protocol (IP) addresses. If your server is a member of a Windows NT 4 domain, a Microsoft Active Directory, or a workgroup, the DNS suffix is dependent upon the domain environment.
Including hyphens and periods, a DNS suffix may contain up to 155 characters.
For more information about DNS configuration, see DNS Configuration. For more information about DNS name resolution, see DNS Name Resolution.