IP Subnet / CIDR Calculator

Calculate network, broadcast, range, and host count from IP and prefix or netmask. All in browser.

Input

IPv4IPv6

IPv4 address

CIDR prefixNetmask

Prefix (1 to 32)

Result

Network:    0.168.1.0
Broadcast: 255.168.1.0
First:     0.168.1.1
Last:      255.168.0.255
Hosts:     4278190079
Mask:      0.255.255.255 (/24)

Frequently Asked Questions

Classless Inter-Domain Routing. The prefix (e.g. /24) is the number of leading 1 bits in the subnet mask. /24 means 255.255.255.0.

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