researchtoolssurveys DNSFactory

Open Resolver Test

This tool sends a single "recursion desired" query to one or more target addresses. If the queries are forwarded to our authoritative server, the host has an open resolver running at that address.

Enter up to 10 IPv4 Addresses:

Alternatively...

You can List all the open resolvers on your network.

You may also query our DNS-based list at dnsbl.openresolvers.org.


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