What is this Subnet Lookup?
When working with networks it is often required to quickly calculate the network boundaries of a subnet from a CIDR address or subnet with network mask. CIDR notation format is a way to express IP addresses and their associated routing prefix. It appends a slash character to the address and the decimal number of leading bits of the routing prefix, e.g., 192.168.2.0/24 for IPv4, and 2001:db8::/32 for IPv6.
Format of the Subnet to Lookup
Enter the subnet to lookup using one of the following formats.
192.168.1.0/24 192.168.1.0 255.255.255.0 10.10.0.0/16
IPv6 Subnet Lookup
Lookup IPv6 subnets using the same format. Simply enter the IPv6 address and include a CIDR notation.
Here are some examples:
API for the Subnet Calculator
In addition to the web form on this page there is another way to quickly lookup a subnet details. Output is simple and of content type text.
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