Back to tools
IP Calculator / IP Subnetting
Calculate IP subnet information for IPv4 and IPv6 addresses. Enter an IP address and netmask to see detailed network information.
Quick select:
About IP Calculator / IP Subnetting
This tool helps you calculate detailed subnet information for both IPv4 and IPv6 addresses. All calculations are performed locally in your browser - no data is sent to any server.
Use Cases:
- • Network planning and design
- • Subnet allocation and management
- • IP address range calculation
- • CIDR notation conversion
- • Network troubleshooting
- • DNS reverse lookup format generation
IPv4 Features:
- • Support for CIDR notation and dotted decimal subnet masks
- • Binary and hexadecimal representations
- • Network and host portion calculation
- • Broadcast address and usable host range
- • in-addr.arpa format for reverse DNS
IPv6 Features:
- • Support for compressed and expanded IPv6 notation
- • Prefix length from 0 to 128
- • Network address and range calculation
- • ip6.arpa format for reverse DNS
- • Full and compressed address display