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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
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"!
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 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-
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 to setup local domain in local network that everyone can see? To map several different subdomain names within a domain to specific ports on the same PC, you will need a proxy server installed on the the PC as well as a DNS server for the local network Domain names are mapped to a specific IP address with the DNS protocol and are not mapped to a specific port at the IP address
Names and maximum lengths of the parts of a URL The Wikipedia entry for Subdomain answers both questions: What is the name of each part? A subdomain is a domain that is part of a larger domain; the only domain that is not also a subdomain is the root domain For example, west example com and east example com are subdomains of the example com domain, which in turn is a subdomain of the com top-level domain (TLD) A "subdomain" expresses