INSPECT & ANALYZE / LOCAL TOOL
IP Subnet Calculator
Calculate IPv4 and IPv6 network ranges from CIDR.
HOW IT WORKS
Applying a CIDR prefix to an IP address
The calculator parses an IPv4 or IPv6 address and uses integer masks to report its network range. IPv4 /31 and /32 ranges receive their special host-count treatment.
Limits to keep in mind
The result describes address arithmetic only. It does not confirm that a network, route, interface or address assignment exists.
A PRACTICAL WORKFLOW
Use the result carefully.
01Enter an IPv4 or IPv6 address followed by a CIDR prefix.
02Run the utility and inspect the complete output.
03Check the prefix length and address family against the network plan before applying a result.
COMMON QUESTION
Does it perform DNS or network lookups?
No. All calculations use the text you enter.