IPv4 Subnet 계산기
「IPv4 Subnet 계산기」는 코드, 데이터 및 QR 작업을 위한 브라우저 도구입니다. 입력과 결과는 일반적으로 이 기기에서 처리되며 가입이 필요하지 않습니다.
사용 방법
사용 방법
- Enter an IPv4 address and choose a CIDR prefix length.
- Calculate the network and review the mask, broadcast, range, and host count.
- Copy the results into a network plan or configuration.
CIDR subnet boundaries
The calculator applies the selected prefix bit by bit to find the network address, then derives the broadcast address from the remaining host bits.
Host counts include edge cases
Traditional subnets exclude network and broadcast addresses. /31 is reported as a two-address point-to-point subnet, and /32 contains one address.
Local browser processing
Validation and calculation happen in your browser. The address is not sent to a server and no network request is made.
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What does /24 mean?
It means 24 of the 32 IPv4 bits identify the network, leaving 8 bits for addresses inside it.
Why are there 254 usable hosts in a /24?
A /24 has 256 total addresses; the network and broadcast addresses are normally reserved, leaving 254 host addresses.
Does this check whether the subnet is in use?
No. It only performs local arithmetic and does not scan, ping, or query any network.
What are /31 and /32 used for?
/31 commonly represents a point-to-point link with two usable endpoints. /32 represents one exact IPv4 address.