CIDR calculator
IPv4 CIDR ranges, masks, hosts, and hex forms
Interactive controls load with JavaScript. Processing stays in your browser.
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How to use
- 输入如 192.168.1.0/24 或单个 IP（默认 /32）。
- 可覆盖前缀长度，查看网络/广播/掩码/主机范围。
- 同时给出十进制与十六进制表示。
- 仅 IPv4，本地计算。
FAQ
Does CIDR calculator upload my data?
No. CIDR calculator runs locally in your browser and does not upload content to www.518882.com or third-party APIs.
Do I need an account?
No. Open and use — no signup, login, or paywall. Open CIDR calculator and use it — no signup, login, or paywall.
How is this different from upload-based tools?
Tools run locally in your browser; content is not sent to our servers for processing — suited to private text and drafts.
Are there limits?
Limited by device memory and the browser; very large inputs may slow the page. There is no account quota.