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CIDR Calculator
Calculate IP ranges, subnet masks, and network information with support for IPv4 and IPv6
Network Input
IP Version
IPv4
IPv6
IP Address
CIDR Notation
/
Subnet Mask
Network information updates automatically as you type
Common CIDR Blocks
IPv4 Private Networks
Class A Private (10.0.0.0/8)
Class B Private (172.16.0.0/12)
Class C Private (192.168.0.0/16)
Loopback (127.0.0.0/8)
Link Local (169.254.0.0/16)
Multicast (224.0.0.0/4)
IPv6 Networks
Global Unicast (2000::/3)
Unique Local (fc00::/7)
Link Local (fe80::/10)
Loopback (::1/128)
Multicast (ff00::/8)
Documentation (2001:db8::/32)
Network Information
Enter an IP address and CIDR prefix to calculate network information