CIDR subnet calculator

Enter a network in CIDR notation, such as `10.0.0.0/16` or `2001:db8::/48`, to see its range, size and usable hosts. Optionally test an address and split it into equal subnets.

IPv6 is calculated exactly, from /0 to /128. Point-to-point /31 networks follow RFC 3021, and addresses are shown in the canonical form of RFC 5952.

These tools run entirely in your browser. Nothing you paste or drop is uploaded, stored, or sent to analytics.

Network (CIDR)

An address without a prefix is treated as a single host.

Is this address or network inside? (optional)

Split into subnets of (optional)

A longer prefix, such as /24. At most 1,024 subnets are listed.

Enter a network to calculate it.

Connect Bex services over the private network