Subnet Calculator

This tool can be used to calculate your subnets in a fast and easy way. You can also use some pre-defined templates.

IP address* Subnet mask* /8 - 255.0.0.0 /9 - 255.128.0.0 /10 - 255.192.0.0 /11 - 255.224.0.0 /12 - 255.240.0.0 /13 - 255.248.0.0 /14 - 255.252.0.0 /15 - 255.254.0.0 /16 - 255.255.0.0 /17 - 255.255.128.0 /18 - 255.255.192.0 /19 - 255.255.224.0 /20 - 255.255.240.0 /21 - 255.255.248.0 /22 - 255.255.252.0 /23 - 255.255.254.0 /24 - 255.255.255.0 /25 - 255.255.255.128 /26 - 255.255.255.192 /27 - 255.255.255.224 /28 - 255.255.255.240 /29 - 255.255.255.248 /30 - 255.255.255.252 /31 - 255.255.255.254 /32 - 255.255.255.255 Templates -- Choose template (optional) -- Default Class A (10.0.0.0) Default Class B (172.16.0.0) Default Class C (192.168.0.0) Easy Class A (10.1.0.0) Easy Class B (172.16.1.0) Easy Class C (192.168.1.0) Calculate

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To learn more about networking and subnetting, read this page.