Enter an IPv4 address followed by a prefix such as /24.
Local IPv4 subnet calculator
IPv4 서브넷 전체를 한눈에 확인하세요.
Calculate network, broadcast, mask, host range, and capacity from an IPv4 CIDR block locally in your browser.
* Nothing is uploaded. CIDRLens calculates the subnet in this browser tab only.
Local IPv4 subnet calculator
Check the boundary before assigning an address
Read the network and broadcast boundaries before choosing a host address.
Use the usable count as a planning hint; routing and reserved addresses can add local rules.
FAQ
What does CIDRLens send?
Does CIDRLens query an IP service?
No. All subnet arithmetic runs locally in your browser.
Does it support IPv6 or VLSM?
No. The first version focuses on clear IPv4 CIDR calculations.