Subnet Calculator

Calculate IP address ranges, subnet masks, and network details from CIDR notation

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Quick CIDR Reference

CIDRSubnet MaskTotal HostsDescription
/32255.255.255.2551Single host
/31255.255.255.2542Point-to-point
/30255.255.255.2524Point-to-point links
/29255.255.255.2488Small subnet
/28255.255.255.24016Very small network
/27255.255.255.22432Small network
/26255.255.255.19264Small network
/25255.255.255.128128Medium network
/24255.255.255.0256Class C
/16255.255.0.065,536Class B
/8255.0.0.016,777,216Class A

Click any row to use that CIDR value