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Utilities

CIDR / IP Range Builder

Convert between IP ranges and CIDR notation, or list all IPs in a block.


    


    

      
CIDR Quick Reference

      

        
PrefixSubnet MaskUsable HostsTotal IPs

        
                    

            /8
            255.0.0.0
            16,777,214
            16,777,216
          

                    

            /16
            255.255.0.0
            65,534
            65,536
          

                    

            /24
            255.255.255.0
            254
            256
          

                    

            /25
            255.255.255.128
            126
            128
          

                    

            /26
            255.255.255.192
            62
            64
          

                    

            /27
            255.255.255.224
            30
            32
          

                    

            /28
            255.255.255.240
            14
            16
          

                    

            /29
            255.255.255.248
            6
            8
          

                    

            /30
            255.255.255.252
            2
            4
          

                    

            /31
            255.255.255.254
            2
            2
          

                    

            /32
            255.255.255.255
            1
            1