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IP Netmask Converter — Decode Any Subnet.
Free IPv4 and IPv6 CIDR calculator to convert subnet masks, wildcard masks, network addresses and address ranges.
This interactive IP Netmask Converter workspace requires JavaScript. How-to instructions, methodology and FAQs are available below.
How to use IP Netmask Converter
Free IPv4 and IPv6 CIDR calculator to convert subnet masks, wildcard masks, network addresses and address ranges.
- Enter an IPv4 or IPv6 address with slash-prefix notation, such as 10.1.4.12/23 or 2001:db8::/48.
- Open Bulk mode to paste additional IP/CIDR entries on separate lines.
- Click Generate results, inspect the network and address-range calculations, and export CSV.
Worked example
Enter 192.168.1.16/24 to get 255.255.255.0, wildcard 0.0.0.255, network 192.168.1.0 and broadcast 192.168.1.255.
How the tool works and its limitations
IPv4 subnet masks set the high-order prefix bits. The network address is address AND mask; the broadcast address combines the network with all host bits set. IPv6 addresses are 128-bit values and do not use broadcast. /31 and /32 IPv4 ranges have special point-to-point/single-address handling.
Frequently asked questions
Does this support IPv6?
Yes. Standard colon-hex IPv6 CIDR notation is supported, including compressed zeros. IPv4-mapped IPv6 tails are intentionally not parsed.
Are IP networks looked up online?
No. CIDR mathematics runs in your browser without consulting DNS or a remote database.
Why are /31 and /32 different?
A /31 is commonly used as a two-address point-to-point network; a /32 identifies one IPv4 address.
Privacy, compatibility and safety
Computations run locally using browser JavaScript. The tool does not intentionally send input data or uploaded file contents to Solvory’s servers. Modern browser APIs, JavaScript support and available device memory affect compatibility and batch size. Inspect the output before using it for critical professional work.