CIDR / 서브넷 계산기

CIDR 블록을 입력하여 네트워크 주소, 브로드캐스트, 사용 가능한 범위 및 서브넷 마스크를 포함한 서브넷 세부 정보를 계산합니다. 모든 처리는 브라우저에서 이루어집니다.

CIDR Notation

Common Subnets

About CIDR / Subnet Calculator

CIDR (Classless Inter-Domain Routing) notation combines an IP address with a prefix length to define a network. This tool calculates all subnet details from a CIDR block. All processing runs in your browser.

Network Address: The first address in the subnet, identifies the network itself.
Broadcast Address: The last address in the subnet, used for broadcasting to all hosts.
Usable Range: Addresses available for host assignment (excludes network and broadcast).
Subnet Mask: Determines which bits identify the network vs. host portion.