One and 2 character domain names are disallowed. As few as three and as many as 63 characters (not including .PH) are permitted. Some mail programs do not accept more than 26 characters in a combined TLD and second level domain name, so we therefore do not recommend more than 23 characters for the second level domain (plus .PH = 26). Names may not begin or end with a dash, and upper case and lower case are treated as lower case only. Besides the "-" character, only alphanumeric characters a-z, 0-9 are accepted. Spaces and any other characters in a name will not be accepted. Names with only numeric characters and names with spaces will not be accepted.
