IP Subnet Calculator & Finder

Free IP subnet calculator for IPv4 and IPv6. Quickly find CIDR, subnet mask, network address, IP range, and broadcast address with accurate results.

Network Configuration
Results

Enter an IP address and subnet mask to calculate subnets.

Use "Find LAN Subnets" to detect common private network ranges.

Network Information
IPv4 Private Ranges
  • 10.0.0.0/8 (10.0.0.0 - 10.255.255.255)
  • 172.16.0.0/12 (172.16.0.0 - 172.31.255.255)
  • 192.168.0.0/16 (192.168.0.0 - 192.168.255.255)
IPv6 Private Ranges
  • fc00::/7 (Unique local address)
  • fd00::/8 (Site local address)
Common Subnet Sizes
CIDR Mask Hosts Use Case
/24255.255.255.0254Small networks
/25255.255.255.128126Medium networks
/26255.255.255.19262Large networks
/27255.255.255.22430Point-to-point
/28255.255.255.24014WAN links
/29255.255.255.2486Point-to-point
/30255.255.255.2522Point-to-point