Webmaster Tools » IP Subnet Calculator

ToolIP Subnet Calculator

Calculation Results

CIDR Range2600::/29
Network Range2600:: - 2600:7:ffff:ffff:ffff:ffff:ffff:ffff
Network Address2600::
Usable Host IP Range2600::1 - 2600:7:ffff:ffff:ffff:ffff:ffff:fffe
Broadcast Address2600:7:ffff:ffff:ffff:ffff:ffff:ffff
Total Number of Addresses633,825,300,114,114,700,748,351,602,688
Number of Usable Hosts633,825,300,114,114,700,748,351,602,686
Subnet Maskffff:fff8::
Wildcard Mask0:7:ffff:ffff:ffff:ffff:ffff:ffff
To convert the IP addresses or masks into different formats, use the IP Address Converter »

What is IP Subnet Calculator?

IP Subnet Calculator is a free online tool that is able to calculate the network address, usable host IP range, the broadcast address, the subnet and wildcard masks. It can also help to estimate the subnet size by reporting the total number of addresses and the number of usable hosts.

What network formats are supported?

This tool can parse network ranges specified by two IP addresses separated by a dash (e.g. - and subnets in CIDR notation (e.g. and convert them back and forth.

Does it support IPv6 addresses?

Yes. And it was an interesting coding challenge, considering how big the numbers can be for IPv6 subnets, so they don't fit into 64-bit integers. (You can check out the IPv6 network operated by Hurricane Electric as an example.)

What is a subnet?

A subnet or subnetwork is a logical subdivision of an IP network. Each subnet contains a number of IP addresses based on its class or subnet mask. The addresses associated to the subnet would be considered the IP range for the subnet.

What is CIDR?

CIDR stands for Classless Inter-Domain Routing and is a system of addressing that is used to create unique identifiers for networks. CIDR notation is a shorthand representation of a range of IP addresses. It consists of an IP address followed by a slash and the bit-length of the subnet mask, for example:

5,000,000 users have improved their SEO