Articles & Guides
Useful resources for web developers and system administrators
DNS
What Is DNS: How It Works and Why You Need It, Explained
What is DNS and how it works: the full path of a lookup, resolver roles, caching and TTL, private DNS over TLS and HTTPS, plus how to check records with dig.
Networking
How to Find a Server Port: Your Own, Remote and Proxy
How to find a server port: which port your service listens on in Linux, Windows and macOS, which port a host answers on, and where the proxy port lives. Real commands.
SSL/TLS
What Is HTTPS: How It Works and How It Differs from HTTP
What HTTPS is in plain terms: how it differs from HTTP, how the TLS handshake works, what the browser padlock really proves and how to check HTTPS on your own site.
Domains
What Is a Domain: Domain Name, Zones and Levels Explained
What is a domain in plain terms: domain name and levels, zones like .com and .ru, domain vs hosting, the domain in an email address, and how to check any domain.
Domains
How to Set Up a Domain: Hosting, DNS Records and Email
How to set up a domain: delegate nameservers, add A and CNAME records, handle www, point the domain to an IP and a server, configure MX and SPF, and debug TTL delays.
Networking
How to Find an IP Address: Your PC, Router and Server
How to find an IP address: public vs local, your computer on Windows, macOS and Linux, the router gateway and any server. Real ipconfig, ip a, dig and nslookup commands.
DNS
How to configure DNS: Windows, router, Android and server
How to configure DNS: change the DNS server on Windows 10 and 11, macOS, Android and your router, set domain A, CNAME, MX and NS records, then verify the result.