Subnet Calculator

Calculate IPv4 and IPv6 network addresses, broadcast addresses, host ranges, subnet masks and more — instantly in your browser.

IP Address / CIDR

Enter an IP address with CIDR prefix (e.g. 192.168.1.0/24) or an IP with a separate subnet mask.

IP Address

or

Subnet Mask / Prefix

IPv6 Address / Prefix

Enter an IPv6 address with prefix length (e.g. 2001:db8::/32 or ::1/128).

IPv6 Address

Quick Reference — Common Subnet Masks

Prefix	Subnet Mask	Wildcard	Total Hosts	Usable Hosts	Common Use

Discover our other tools

Free browser-based IT tools — no registration required.

Analyze Windows Event Viewer CSV exports and get instant fix recommendations.

Check your Active Directory health with dcdiag, repadmin and GPResult analysis.

Plan and calculate VLAN segments, IP ranges and network topology for your infrastructure.

Generate strong, secure passwords with custom rules. 100% client-side, nothing sent to servers.

Design and visualize your server rack layout with drag-and-drop. Export as PNG.