Free online subnet calculator, supports IP address subnet division, CIDR calculation, network address, broadcast address, usable IP range, host count and other quick calculations. Suitable for network planning, IP allocation, subnet mask calculation and other scenarios.
Free online subnet calculator, supports IP address subnet division, CIDR calculation, network address, broadcast address, usable IP range, host count and other quick calculations. Suitable for network planning, IP allocation, subnet mask calculation and other scenarios.
Free online subnet calculator, supports IP address subnet division, CIDR calculation, network address, broadcast address, usable IP range, host count and other quick calculations. Suitable for network planning, IP allocation, subnet mask calculation and other scenarios.
Open the tool page — no download or installation needed Enter an IP address and choose a subnet mask or set the CIDR prefix Click "Calculate" to view the results, verify them, and copy any value with one click
The tool is completely free and requires no sign-up or login All calculations run locally in your browser — your data is never uploaded
Yes, Subnet Mask Calculator is completely free. No download or installation required — it runs right in your browser.