🌐 Network Articles
Network guides and resources for using our free online tools.
Jun 29, 2026
CIDR to IP Range Guide: How CIDR Notation Works
Learn exactly what CIDR notation is, how to read it, and how to calculate massive IP ranges. Free browser-based CIDR to IP range expander included.
Jun 29, 2026
MAC Address Generator Guide: What Are MAC Addresses?
Learn what MAC addresses are, how they are structured by manufacturers, and why developers generate them. Free MAC address generator included.
Jun 29, 2026
Public IP Lookup Guide: Find Your Public IP Address
Learn exactly what a public IP address is, how ISPs assign them, and how to find yours. Free browser-based public IP lookup tool included.
Jun 28, 2026
DNS Lookup Guide: How to Check DNS Records (A, MX, CNAME)
Learn how to look up DNS records for any domain, how the resolution works, and what SPF/DKIM do. Free DNS lookup tool included.
Jun 28, 2026
IP Address Lookup Guide: How to Identify IP Classes and Types
Learn how to look up IP address details, understand IPv4 structures, and identify public vs. private IPs. Free IP address lookup tool included.
Jun 28, 2026
Port Checker Guide: How to Check If a Port Is Open
Learn how to check if a TCP port is open, closed, or blocked by a firewall. Free online port checker for network troubleshooting.
Jun 28, 2026
IP Subnetting Guide: How to Calculate Subnets
Learn how IP subnetting works, CIDR notation, and how to mathematically calculate network addresses. Free subnet calculator included.