What is the structure of a domain name? Each domain name consists of its name and domain extension i.e. yahoo.com where yahoo -name, .com -extension. The name is built up with letters [A-Z], numbers [0-9], hyphens [-], or a dot [.], only one per domain name. Minimum 3 characters, maximum 63 characters. Domain name extensions vary depending on which can be provided by your registrar.

What kinds of TLD’s exist? TLD stands for top-level domain and means the domain name’s extension. In other words it is the last part of your domain name after the final dot. There are two groups: Generic TLD: .com, .gov, .net, .biz, .org, etc Country Code TLD: .ge, .co.uk, .fr, .at, .ca, etc

Which one should I use? In the past generic extensions were associated with specific activities (.com commercial, .edu educational, .org non-profitable, .net network, etc). These days nearly all restrictions in this group are purely symbolic – if you cannot obtain your desired domain name with .com extension you just search all other possible extensions. In country code extension group however there are sometimes restrictions as to minimum name length, residential status, no-resale rights.