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Can (domain name) subdomains have an underscore _ in it? "domain name" is an ambiguous term What it means vary when used in a DNS settings vs when viewed in a "registration" setting, aka when you are about to register a given name You can't register a domain name with an underscore because in the registration plane a domain name is in fact more an hostname in the DNS terminology and hence more restrictive in allowed characters (but then there are
Is there a standard domain for testing throwaway email? If even a valid looking domain name is used, non-routeable email addresses that don't have properly configured MX servers are rejected As a result, I wouldn't use a email address you don't own
What is a regular expression which will match a valid domain name . . . 149 I know that this is a bit of an old post, but all of the regular expressions here are missing one very important component: the support for IDN domain names IDN domain names start with xn-- They enable extended UTF-8 characters in domain names For example, did you know "♡ com" is a valid domain name? Yeah, "love heart dot com"!
What are the allowed characters in a subdomain? - Stack Overflow This answer addresses what is allowed for non-IDN domain names, and does not define behavior for a web browser, client application, or application server If you've set up a wildcard (*) to route traffic somewhere, it's possible for a subdomain to contain characters beyond the set of a-zA-Z0-9-
What top-level domains does youtube have? - Stack Overflow I am trying to identify youtube link (generally), and I wonder what top-level domains is youtube using? So far I know about: com (youtube com) be (youtu be) Are there any others? PS: for those
Valid characters of a hostname? - Stack Overflow Checkout this wiki, specifically the section Restrictions on valid host names Hostnames are composed of series of labels concatenated with dots, as are all domain names For example, "en wikipedia org" is a hostname Each label must be between 1 and 63 characters long, and the entire hostname (including the delimiting dots but not a trailing dot) has a maximum of 253 ASCII characters The
How do I register a domain with special symbols or characters? I tried to register a domain with a heart ♥ on a few of the more popular domain name registrars, but upon submitting I was told that the domain name contained invalid characters How do I search and register a domain with one of these symbols or characters?