DNS Research at Team Cymru

If you arrived here to inquire about why this host was probing your network, please read on. We are Team Cymru, security research think tank dedicated to making the Internet more secure. The following hosts are part of our research that helps us conduct Internet DNS security assessments, diagnostics and measurement tests. All packets originating from these servers should be benign and relatively infrequent:

Please note, the DNS research system has recently moved. Prior to October 12, 2012, DNS related activity was from the following systems, but these have been removed from services and the dnsresearch.cymru.com name servers are now configured as shown above.

If you are a DNS administrator or other similar contact for an autonomous system (AS), a set of netblocks or DNS servers on the Internet and are interested in the securing your DNS infrastructure, we provide a number of free services you may be interested. Feel free to contact us at team-cymru@cymru.com if you have questions or would like to obtain a data feed. Some of the DNS-related documents, tools and reports we work on include: