Subnet calculator

IPv4 or IPv6 address, optionally with a prefix

IPv4 accepts a prefix (/24) or a dotted netmask (/255.255.255.0). No prefix defaults to /32 (v4) or /128 (v6).

{{ result.version === 4 ? 'IPv4' : 'IPv6' }} network details

Network address	{{ result.network }}
Broadcast address	{{ result.broadcast }}
Netmask	{{ result.netmask }} (/{{ result.prefix }})
Wildcard mask	{{ result.wildcard }}
{{ result.version === 4 ? 'First usable address' : 'First address' }}	{{ result.first }}
{{ result.version === 4 ? 'Last usable address' : 'Last address' }}	{{ result.last }}
Total addresses	{{ result.total }}
Usable hosts	{{ result.usable }}
/64 subnets	{{ result.subnets64 }}
Binary	{{ result.binary }}

Prefix	Netmask	Wildcard	Addresses	Usable hosts
/{{ r.prefix }}	{{ r.netmask }}	{{ r.wildcard }}	{{ r.total }}	{{ r.usable }}

Prefix	Addresses	/64 subnets	Common use
/{{ r.prefix }}	{{ r.total }}	{{ r.subnets64 }}	{{ r.use }}

Runs entirely in your browser — nothing is sent to the server.