CIDR / Subnet Mask Converter
CIDR站长工具免费工具本地处理
CIDR/mask converter: IP/prefix in, network address, mask, broadcast, usable range and host count out.
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How to Use
- Enter an IP, CIDR, or subnet parameter
- Click convert/calculate to run
- Copy network address, mask and more
- All checks and generation run locally — nothing is uploaded
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FAQ
Is any data uploaded?
No, all processing happens locally; nothing you type or upload ever reaches a server.
Are results accurate?
Standard public formulas and parameters are used; defer to official sources for policy rates.
Which browsers are supported?
Modern Chrome, Edge, Safari and Firefox; camera/mic features require permission grants.