Domain Levels and Subdomains

Global top level  domains (TLDs):

• Traditional: .com, .org, .net, .info, .biz
• New TLDs: .shop, .site, .game, .fun, etc.

Country top level domains (Country TLDs):

• .uk, .it, .de, .fr, .vn, etc.

Country second level domains (Country SLDs):

• .me.uk, .co.uk, .org.uk, .co.kr, .com.vn, etc.

Note that although second level domains consist of 2 components but they are still domains, not subdomains.

Subdomains are additional components after TLDs, country TLDs, or country SLDs, for example:

• Subdomains without dots:
• abc.xyz.com
• abc.xyz.uk
• abc.xyz.co.uk
• Subdomains with dots:
• foo.abc.xyz.com
• foo.abc.xyz.uk
• foo.abc.xyz.co.uk