0:800::401/123 | ip calcalutor | 0:800::401/123 network number, 0:800::401/123 netmask address, 0:800::401/123 broadcast address, 0:800::401/123 wildcard mask address, whois 0:800::401/123, 0:800::401/123 reverse lookup, subnet calc, subcalc, subnetcalc, ipcalc, sipcalc