Each Top level domain has an administrator responsible for running that tld. Including running it's DNS. The root domain ".", routes the request to the correc

Each Top level domain has an administrator responsible for running that tld. Including running it's DNS. The root domain ".", routes the request to the correct TLD DNS server. So technically, first you ask the root server for the DNS server of .com, then ask .com for google.com, etc. (Technically the DNS entry is google.com. ) .com is administrated by Verisign. https://en.m.wikipedia.org/wiki/List_of_Internet_top-level_domains https://en.m.wikipedia.org/wiki/List_of_Internet_top-level_d... has more info.