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- Squish DNS (A, SOA, CNAME, NS, PTR, AAAA. ANY) tester
 
- What’s my DNS DNS propagation tester
 
- DNS-OARC Web-based DNS randomness test
 
-  Robtex  RBL Realtime Block List,  Domain Name Server records, IP Reverse DNS,  C-Network,  Domain
 
- Whois,  Route,  AS Analysis, DNS graphs
 
- DNSstuff IP, whois, country IP, traceroute, VectorTrace, DNS traversal, Speed tests, HTML validator
 
- What’s my IP IP, DNS, whois, traceroute testers, port scanner
 
- w3dt DNS lookup, DNS traversal, PortScan, trace route, RBL check, MTU route, NTP test, remote process list
 
- Into DNS
 
       
Hi, may i mention http://w3dt.net (World Wide Web Domain Tools) it also has an extensive set of free tools for DNS/Network testing & Troubleshooting.
Thanks Dave! Added to the list!