IP Subnet Calculator

As a network engineer, I deal with subnetting daily. This IP Subnet Calculator makes converting IP ranges to CIDR notation incredibly fast. The range-to-CIDR feature is spot on — it gives the minimal set of CIDR blocks every time. Much better than doing it manually or using outdated desktop tools.

The CIDR-to-range feature is exactly what I needed for configuring firewall rules. It shows network address, broadcast, usable hosts, subnet mask, and wildcard mask all at once. The hexadecimal conversion is a nice bonus for when I'm reading packet captures. Everything runs locally, which is great for security.

I frequently need to convert IP addresses to hex for low-level network configurations. This tool handles it perfectly, giving me hex with and without the 0x prefix, dotted hex format, decimal integer, and binary — all at once. The copy button on each result is a thoughtful touch. Clean interface, fast results.

Working in cybersecurity, I often need to quickly convert between IP ranges and CIDR for ACL configurations and threat intel analysis. This calculator is fast, accurate, and works entirely in the browser — no data leaves my machine. The hex-to-IP converter is also invaluable when analyzing raw network logs.

Planning VPC subnets in AWS and Azure requires precise CIDR calculations. This tool makes it effortless — I enter an IP range and instantly get the CIDR blocks. The subnet detail view showing usable hosts and wildcard masks is exactly what I need for Terraform configs. Bookmarked and use it daily.

I use this tool to demonstrate subnetting concepts to my CCNA students. Being able to show IP ranges converted to CIDR, and then back to full subnet details, makes the concepts much clearer. The binary and hex representations help students understand how IP addresses work at the bit level. Excellent educational tool.