CIDR Subnet Calculator — Paste any IP address with a CIDR prefix (like 192.168.1.0/24 or 2001:db8::/64) and see the network, broadcast, mask, wildcard, and usable host range. Works for both IPv4 and IPv6.
Calculation runs locally in your browser. No network calls.
Was CIDR Subnet Calculator useful?
CIDR Subnet Calculator是什么？
Paste any IP address with a CIDR prefix (like 192.168.1.0/24 or 2001:db8::/64) and see the network, broadcast, mask, wildcard, and usable host range. Works for both IPv4 and IPv6.
Pure math — no network calls. Useful for planning network ranges, configuring firewalls, or learning subnetting.
使用方法
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Type an IP with a prefix
Format: IP/prefix, e.g. 10.0.0.0/8 or 2001:db8::/32.
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Read the result
Network address, mask, wildcard, broadcast (IPv4), and usable host count are shown. For IPv6, the total address count is shown (it is usually astronomically large).
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Last reviewed: 2026-09-25