I know that IIS versions 7.5 and earlier do not support wildcard host header bindings.
Have they added it in the latest version (8.5)? I see that it finally supports SNI and wildcard binding (*.mydomain.com) seems like it would be a related feature.
Best Answer
Worth noting that IIS 10.0 does support wildcard host names, see: http://www.iis.net/learn/get-started/whats-new-in-iis-10/wildcard-host-header-support