如何 I 检查如果 IP 是在 CIDR 范围?

将 the IP and network address 转换为 32-bit integers. AND both with the subnet mask. If the results are equal, the IP is in the range. For example, 192.168.1.100 AND 255.255.255.0 = 192.168.1.0, which matches the network 192.168.1.0/24

什么是 smallest useful subnet?

/30 gives 2 usable hosts (4 addresses minus 网络和广播) — used 为 point-to-point links 之间 routers. /31 (RFC 3021) gives 2 hosts 具有否广播, used 为 point-to-point 在现代 networks. /32 是单个主机 (主机路由).

Use CIDR notation 为网络 ranges

CIDR (Classless Inter-Domain Routing) compactly represents IP ranges. Learn prefix lengths, subnet masks, 和如何检查如果 IP 是在范围.

1

CIDR notation (IP/prefix) replaces classful addressing. /8 = 16M hosts (former 类 ), /16 = 65K (类 B), /24 = 256 (类 C), /32 = 1 主机. prefix determines subnet mask: /24 → 255.255.255.0, /16 → 255.255.0.0. 到检查如果 IP 是在 CIDR 范围, 和 IP 具有 mask 和比较到网络 address.
2

IP 信息查询器 →
Enter CIDR 阻止 (e.g., 10.0.0.0/8) 到 see subnet mask, wildcard mask, 网络和广播 addresses, 和总计 addresses. 此是 useful 为 firewall rules 和 access control lists.
3

高精度计算器 →
将 a prefix length 转换为 a subnet mask. /20 → 255.255.240.0. The first 20 bits are 1, the rest are 0. In binary: 11111111.11111111.11110000.00000000. The wildcard mask is the inverse: 0.0.15.255

常见问题

如何 I 检查如果 IP 是在 CIDR 范围?: 将 the IP and network address 转换为 32-bit integers. AND both with the subnet mask. If the results are equal, the IP is in the range. For example, 192.168.1.100 AND 255.255.255.0 = 192.168.1.0, which matches the network 192.168.1.0/24
什么是 smallest useful subnet?: /30 gives 2 usable hosts (4 addresses minus 网络和广播) — used 为 point-to-point links 之间 routers. /31 (RFC 3021) gives 2 hosts 具有否广播, used 为 point-to-point 在现代 networks. /32 是单个主机 (主机路由).

常见问题

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