The Subnet Calculator helps networking students and professionals calculate subnet mask, network address, broadcast address, and usable IP range using CIDR notation.
A subnet is a logical subdivision of an IP network. Subnetting improves network performance, security, and management.
What is CIDR?
Classless Inter-Domain Routing.
Is this IPv4 only?
Yes, currently IPv4 supported.
Is this calculator accurate?
Yes, based on standard subnet rules.