This page provides a list of reliable, free, web-based tools for IP address calculation, subnet planning, CIDR conversion, and VLSM design.
🧠 Use these calculators for network sizing, subnet splitting, IP range discovery, and subnet-to-mask conversion.
| Tool Name |
Description |
Link |
| IPCalc.co |
Fast and simple subnet calculator with CIDR tool |
Visit |
| SubnetOnline.com |
IPv4/VLSM/IPv6 calculators and subnetting practice |
Visit |
| DNS Checker Subnet Tool |
Clean interface with subnet range and mask finder |
Visit |
| MXToolbox Subnet Calculator |
Professional-grade subnetting and diagnostics |
Visit |
| TechZoom IPCalc |
Lightweight CIDR/IP subnet calculator |
Visit |
| Tool Name |
Description |
Link |
| CIDR to IP Range Tool |
Converts CIDR to usable IP ranges |
Visit |
| DNS Stuff IP Tools |
Subnet mask and CIDR conversions |
Visit |
| WhatIsMyIP CIDR Tool |
Converts and analyzes CIDR blocks |
Visit |
| Tool Name |
Description |
Link |
| SubnetOnline IPv6 |
Full IPv6 subnetting with compression view |
Visit |
| TestIPv6.com |
IPv6 readiness and subnet info |
Visit |
| IPv6Calc |
Multi-format IPv6 conversions |
Visit |
| Tool Name |
Description |
Link |
| Routerfreak VLSM Tool |
Plan subnets by required host count |
Visit |
| Calculator.net IP Tool |
Subnetting with required number of hosts |
Visit |
| SolarWinds VLSM Tool |
Advanced subnet planning (free tool) |
Visit |
- IP planning for office networks
- CIDR/subnet lookup
- Firewall rule configuration
- Device IP allocation