Subnet Calculator
Calculate IPv4 networks, host ranges, and subnet masks.
Useful tools for everyday technical work.
17 tools
Calculate IPv4 networks, host ranges, and subnet masks.
Query public PTR records for an IPv4 address.
Check IPv6 address syntax, including compressed notation.
Inspect local address ranges, binary notation, and historical IP classes.
Convert a contiguous subnet mask or prefix into network and wildcard masks.
Count addresses between two inclusive IPv4 endpoints.
Look up OSI layers, VLAN ranges, common MTUs, and port ranges.
Validate IPv4 addresses and identify private ranges.
Normalize MAC addresses into common formats.
Look up common service ports and transport protocols.
Query public DNS records through Google Public DNS.
Follow a guided sequence to isolate connection problems.
Inspect the scheme, hostname, path, and parameters of a URL.
Build ping, traceroute, nslookup, or dig commands for a host.
Plan TTL reduction and a DNS change using explicit timestamps.
See IPv4 network boundaries, usable hosts, and broadcast at a glance.
Allocate variable-size IPv4 subnets for requested host counts.