hostnag

Look up a DNS record from outside your network

Look up a record for a host from outside your own network, with the resolver you name or the runner's own. It runs once from US East with a 10 second cap, the same runner a monitor uses.

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 rejectedWhat SPF, DKIM and DMARC each do, how to read a record term by term, the dig commands, and the mistakes that get legitimate mail rejected.

Watch this for good.

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