The host name part of the absolute URL of your blog.

Attributes:

• exclude_port (optional; default "0")

  Removes any specified port number if this attribute is set to true (1), otherwise it will return the hostname and port number (e.g. www.somedomain.com:8080).

• signature (optional; default "0")

  If set to 1, then this template tag will instead return a unique signature for the hostname, by replacing all occurrences of decimals (".") with underscores ("_").