The term "standard host name" can refer to two things:
1. A standard host name is referred to as locally configured host name as obtained with gethostname() API as indicated by the links.
2. A host name that is compliant with RFC952 or RFC 1123.
This ambiguity may mislead the reader.
So, rather than using the term "standard host name", I would simply say "if the value of host name does not confirm to RFC 952 or RFC 1123....."