Submit a ticket with support.atlassian.com. THey will support this in certain circumstances.
If you mean that you're hosting the tools in a publicly accessible areas, the use of a webserver acting as reverse proxy ( using nginx or apache) would be the most straight-forward way to limit access to a particular network segment. https://confluence.atlassian.com/display/JIRA/Integrating+JIRA+with+a+Web+Server, The Apache Allow - http://httpd.apache.org/docs/2.2/mod/mod_authz_host.html#allowdirective will allow you to specify a domain or IP range to allow traffic, and block all else.
Otherwise the global permissions would be the place to prevent "Anonymous" access, but the site would still be publicly available. (just no details visible)
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