Letters and numbers are always valid characters. Hyphens may also be used in but may not begin nor end your domain name. Spaces and special characters are never permitted. The special characters include, but are not limited to, these special characters: ! @ # $ % ^ & * ( ) ? "

.uk ending domains

Visit the Nominet website if you are unsure of the rules that apply. This is particularly important for .ltd.uk and .plc.uk domains.

US domains

You can use up to 67 characters in your domain name, including the extension .com, .net, .org or .info (and .biz, coming soon!)