Subnet Calculator
Enter an IPv4 address in CIDR notation to calculate the network address, broadcast address, subnet mask, wildcard mask, usable host range and total host count. Runs entirely in your browser.
About the Subnet Calculator
Enter an IPv4 address in CIDR notation to calculate the network address, broadcast address, subnet mask, wildcard mask, usable host range and total host count. Runs entirely in your browser.
This tool runs completely offline in your browser. Nothing you enter is uploaded, which makes it safe to use with sensitive values such as internal addresses or tokens.
Frequently asked questions
What does the Subnet Calculator do?
Enter an IPv4 address in CIDR notation to calculate the network address, broadcast address, subnet mask, wildcard mask, usable host range and total host count. Runs entirely in your browser.
Is the Subnet Calculator free to use?
Yes. The Subnet Calculator is completely free with no account, no signup and no usage limits for normal use.
Is my input sent to your servers?
No. The Subnet Calculator runs entirely inside your browser using JavaScript, so nothing you type is transmitted to NetScanly or anyone else.