Domain Name With Underscore Example. However the CNAME name parameter must always begin with a leading underscore. No its not possible the underscore is not a permitted character in any domain name.
Salesforce will not allow this so it forces us to enter an incorrect address or leave it blank. Underscore_ character can be used in the domain names. However in practice the global DNS system allows underscores to be used in hostnames.
However despite the fact that RFC 1035 does not permit underscores in registered domain names they have been widely used in subdomains eg.
Domain name is the identifier of a resource in a DNS database. Under Type select SRV. How disjointed namespaces occur. No its not possible the underscore is not a permitted character in any domain name.