Free online network tools, including traceroute, nslookup, dig, whois, ping, and our own Domain Dossier and Email Dossier. Works with IPv6. Some source code included.
DNSCrawler.com offers a host of free tools for looking up, examining and testing your DNS setup and IP addresses, looking up autonomous system numbers, and performing CIDR, netmask and bitmask calculations for IPv4 and IPv6 addresses. Our free DomainValid
Zonecheck DNS tools, check your domain DNS, ensure zone validity before delegation, test reachability by port scan, traceroute, ping and smtp open relay testing on both ipv4 and ipv6
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