DNS Flow from DNSsimple.com
- Browser → Browser cache
- Browser → OS
- OS → OS cache2
- OS → Resolver (ISP)
- Resolver → Root
- Resolver ← TLD server addr ← Root
- Resolver → TLD server
- Resolver ← Authorative Server addr (nameservers) ←< TLD server
- Resolver ← IP addr ←< Authorative server addr
The domain registrars reserves the name and communicates with TLD servers
FQDN - http://api.www.example.com. . → Root com. → TLD example.com. → SLD (Second Level Domain) or Authorative server www.example.com. → Sub Domain api.www.example.com. → FQDN http://api.www.example.com. → URL