We have ecountered a problem with a certain application that fails with machines whose hostname begins with a numberic character. I was wondering if anyone knows if there is an RFC that warns about using numerics as the first character in a hostname convention. Changing the hostname fixes the problem that we are encountering, but since the naming standard for certain devices on a particular subnet was adopted by another organization to begin with numeric characters, we are trying to find an RFC that we can used to convince them that this is not a good practice. This particular problem is probably how the application was coded. I am suspecting that the application is viewing the hostname as either an IP address and return an invalid error, since in the step that it fails is where it attempt to setup the DISPLAY environment variable. I know this is a DNS Bind forum, but I didn't know where this question actually fitted in. Thanks in advance for any help.