Free, fast diagnostic tools for DNS, email authentication, and network security

Before everyone else starts posting their competing products and projects, just want to say this looks cool. Nice domain name. Usually the hope is that this becomes a go-to tool for everyone. These sites are a thankless resource to the internet community.

Remember dnstools back in the day 10-15 years ago? It was so awesome. Then they crippled it by trying to monetize it? Not that they shouldn't make money. It's just hard keeping something online for so long which becomes a thankless resource.

Poked around for a few minutes and this is nicely done. Coverage of the less common records (MTA-STS, BIMI, TLSA, CAA) in one place is the part that jumped out. Usually I bounce between two or three sites to get those.

One thing that would be handy: a shareable permalink for a given lookup result, so you can paste it into a ticket or chat instead of retyping the query.

IPv6 addresses in the propagation display are inconsistently displayed - sometimes using '::' compression, sometimes not.

For instance, with https://mrdns.com/propagation?name=wikipedia.org&type=AAAA the same address is formatted as either '2620:0:861:ed1a::1' or '2620:0:861:ed1a:0:0:0:1'. The :: form is generally preferred.

I like https://dnscheck.tools/ for this.