hostnag

Look up a DNS record from the internet

Look up a record for a host from the internet, with the resolver you name or the runner's own. It runs once with a 10 second cap, the same runner a monitor uses; the result says where it ran.

Optional. A public resolver's IP; otherwise the runner's own.

How to read this

Answers
Every value the record resolves to right now, in the order the resolver returned them.
Resolver
Which resolver answered: the one you named, or the runner's own.

Questions

Is this a scan?

No. It resolves the one record type you asked for, once.

Why is a private address refused?

A resolver on a private or loopback address is refused for the same reason a private target is.

Related

DNS monitoringThe records that point people and mail at your systems, watched for drift from the answer you told hostnag to expect.

Read

SPF, DKIM and DMARC explained: how to read the records and the mistakes that get mail rejectedRead SPF, DKIM and DMARC records term by term, look them up with dig, and fix the mistakes that get legitimate mail rejected.

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