Domains & DNS
Why Does DNS Still Show an Old Result After a Change? Separating TTL from Negative Caching
After a DNS change, the result may be an old record value, NXDOMAIN, or NODATA. Learn what each response means and why it may remain cached.
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Domains & DNS
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Domains & DNS
How to Read HTTP Status Codes and JSON Types in an RDAP Response
Start interpreting an RDAP result with the HTTP status code and JSON structure before reading object fields. This helps distinguish successful queries, unsupported query types, and invalid requests.
Domains & DNS
When Should You Separate a Domain Query from a Nameserver Query in RDAP?
The right RDAP starting point depends on the target of your question: a domain, one nameserver, or a set of search results.
Domains & DNS
Why Can Domain Information Look Limited in an RDAP Response?
A field missing from an RDAP response does not by itself mean that no record exists. Review data scope, authorization, and the queried object type together.
Domains & DNS
Why Should Old TXT Records Be Cleaned Up in DNS-01 Validation?
More than one TXT record can exist under the same DNS-01 name. But as old records accumulate, the DNS response can grow and Let’s Encrypt may reject it.
Domains & DNS
How to Read RDAP Nameserver Information with Domain Delegation
RDAP treats a domain object as a DNS name and a point of delegation. Learn to read ldhName, v4, and v6 in nameserver objects carefully.
Domains & DNS
What Makes Up the DNSSEC Chain of Trust?
DNSSEC validation does not rely on one record alone. A trust anchor starts a chain of DNSKEY and DS links leading to signed DNS data.
Domains & DNS
How to Separate Domain Status and Registration Events in RDAP
In an RDAP response, status describes the registered object’s state, while events describe occurred or future-dated events. Keeping them separate helps you read registration data carefully.
Domains & DNS
Why Can a DNS Answer Look Different on Different Networks? Authoritative Servers and Caches
Different DNS results after a change can arise from the difference between authoritative information and information retained by the DNS service reached by a query.