64:ff9b::/20 | ip calcalutor | 64:ff9b::/20 network number, 64:ff9b::/20 netmask address, 64:ff9b::/20 broadcast address, 64:ff9b::/20 wildcard mask address, whois 64:ff9b::/20, 64:ff9b::/20 reverse lookup, subnet calc, subcalc, subnetcalc, ipcalc, sipcalc