DNS Checker

We have just released a new utility in the Apple app store. It tests recursive DNS servers for conformance against current DNS protocol specifications, especially with regard to EDNS(0) as specified in RFC 6891.

Like our other utility on the app store, Dig, this is a free download, and we do not provide formal support for it. Ray Bellis, ISC’s DNS Researcher, is the author.

Recent Posts

What's New from ISC

Encrypted DNS: Why all the drama about DOH?

Two years ago, interest in DNS Encryption was lukewarm… In May of 2018, ISC did a survey asking our users about their interest in deploying various DNS privacy measures, including both QNAME minimization and encryption (DNS over HTTP or DoH and DNS over TLS or DoT).

Read post
Previous post: BIND 9 Refactoring