📚 Learn Networking

Educational guides to help you understand the internet, networking, and security fundamentals.

What is an IP Address?

Learn how IP addresses work, the difference between IPv4 and IPv6, and how your device is identified on the internet.

Understand the Domain Name System — the phonebook of the internet that translates domain names to IP addresses.

Learn about domain registration records, RDAP, and how to look up who owns a domain or IP block.

A beginner's guide to Virtual Private Networks — encryption, tunneling, and when you should use one.

Compare the two IP protocols, understand address exhaustion, and see why the transition to IPv6 matters.

How HTTPS encryption works, certificate authorities, and why every site needs SSL.

Learn CIDR notation, subnet math, and how networks are divided into smaller segments.

A reference guide to well-known TCP/UDP ports — HTTP, HTTPS, SSH, DNS, FTP, and more.

How firewalls protect networks by filtering traffic, types of firewalls, and modern network security.

How DNS-based blacklists work, why IPs get listed, and how to check and delist your IP.

Essential HTTP security headers including HSTS, CSP, X-Frame-Options, and how they protect your site.

How traceroute maps packet paths across the internet using TTL mechanics.

How proxy servers work, types of proxies (forward, reverse, SOCKS), and when to use them.

The TLS handshake, certificate verification, and encryption that makes HTTPS secure.

Network Address Translation — how multiple devices share one public IP address.

How DoH encrypts DNS queries to improve privacy and prevent snooping.

How Content Delivery Networks speed up websites with edge caching worldwide.

How IP-to-location mapping works, accuracy limitations, and real-world applications.

Practical guide to diagnosing network issues with ping, traceroute, nslookup, and more.

How email authentication protocols prevent spoofing and improve deliverability.