#dns

Ask a domain monitoring tool when example.com expires and you get a date in a second. Ask about an...

Three earlier articles in the AWS Network Architecture series each hit the same wall and moved past...

Your app sends a password reset. The user never gets it. Nothing errors on your side: the receiving...

Understanding DNS resolvers, root servers, TLD servers, authoritative name servers, and DNS caching through a practical example.

Nineteen titles, no fingerprint, and a stable repeat query. What a small count can still prove about a DNS load balancer, and why the recursion test replaces the signature.

Variant 7 analysis of four NSD stack overwrite flaws fixed in 4.15.3, with measured ZoomEye exposure context.

Variant 5 analysis of four NSD stack overwrite flaws fixed in 4.15.3, with measured ZoomEye exposure context.

Your mail quietly started landing in spam, and when you checked SPF you found this: PermError: too...

Variant 6 analysis of four NSD stack overwrite flaws fixed in 4.15.3, with measured ZoomEye exposure context.

Variant 4 analysis of four NSD stack overwrite flaws fixed in 4.15.3, with measured ZoomEye exposure context.

For anyone who has accidentally deleted DNS records in a DNS management console, this article explains how to manually restore 13 records in about 11 minutes using a pre-deletion list and authoritative DNS information, and how to prepare in advance.

Check whether anyone can send email pretending to be your domain or your suppliers. Free, no account, graded A to F, with the exact DNS records that raise the grade.