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CIDR/Subnet Mask Converter

This tool quickly changes CIDR notation to subnet mask and back
Enter a list of IPs and subnet masks (e.g. 192.168.0.0 255.255.255.248) or IPs and CIDR (e.g. 192.168.0.0/29)

Invalid input will simply be ignored.

Select conversion method:

List your IP Networks and CIDR/IP Networks and Subnet Mask:

Any tools provided here are as is, no warranty provided, use at your own risk.

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Lightbulb icon by iconoci from the Noun Project...slightly modified.

This product includes GeoLite2 data created by MaxMind, available from http://www.maxmind.com.