NETWORK · FREE TOOL
IPv4 Subnet Calculator
Calculate network, broadcast, mask and usable host ranges.
PROCESSED IN YOUR BROWSER
Clear results without unnecessary data collection.
Values stay in this browser tab and are not sent to the server.
Enter an IPv4 address and prefix.
SAFE USE
Practical, transparent and privacy-aware.
Use authorized targets
Run network checks only against systems you own or have explicit permission to assess.
Keep secrets out
Never paste passwords, access tokens, private keys or confidential customer data into diagnostic tools.
Confirm important findings
Automated results are a starting point. Validate changes in a staging environment before production.
Review regularly
Certificates, DNS records and web configurations change, so repeat important checks after deployments.