IPv4 子网计算器
为任意 IPv4 CIDR 块计算网络地址、广播地址、掩码、通配符掩码和可用主机范围。
使用方法
Calculate a subnet
Enter an address with a prefix such as 192.168.1.0/24. The tool computes every key value for that block.
- Enter an IPv4 address or CIDR block.
- Read the network and broadcast addresses.
- Copy the JSON result for scripting.
Usable hosts
For prefixes from /1 to /30 the first and last addresses are reserved, so usable hosts equal the total minus two. /31 and /32 are treated as point-to-point and single-host ranges.
常见问题
What is a wildcard mask?
A wildcard mask is the bitwise inverse of the subnet mask. It is commonly used in access control lists.
How do I know if an address is private?
The tool flags 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16 as private networks.