A domain doesn't point to just one address — it points to a set of DNS records with different purposes: one handles the website, another handles email, another stores text metadata for verifying domain ownership. Let's look at the record types and how to check them quickly.
The main DNS record types
- A — links the domain to a server's IPv4 address. The most basic record: it determines where a browser lands when someone visits the site.
- AAAA — the same thing, but for an IPv6 address.
- MX — specifies which server accepts mail for the domain, and in what order to try multiple servers (priority).
- TXT — arbitrary text, most often used to verify domain ownership and for SPF records that authorize sending mail on the domain's behalf.
- NS — which name servers serve the domain's zone, i.e. who to ask for all the other records.
- SOA — an administrative record with zone parameters: the primary name server, admin contact, caching times.
How to check online
Open DNS lookup, enter a domain, and the tool shows every published A, AAAA, MX, TXT, NS, and SOA record. The query runs server-side rather than in the user's browser, so the result isn't affected by any single computer's cache and reflects the DNS zone's current state.
Common use cases
- Setting up email. After adding MX and SPF records at your registrar, it's worth immediately checking that they're actually published and point to the right server.
- Migrating a site. Before switching DNS to new hosting, it helps to confirm the A record points to the new IP and hasn't been left over from the old host.
- Troubleshooting. A site or mailbox isn't behaving as expected — a quick check of the records often reveals the cause right away (a forgotten or incorrect MX record, for example).
Why the result can differ from what your browser sees
DNS records are cached at several levels: in the browser, in the operating system, and at your ISP. After a record changes at the registrar, that change doesn't appear everywhere instantly — it propagates gradually, and the speed depends on the record's TTL (time to live). A server-side check bypasses local caches and usually shows a fresher state, but full worldwide synchronization can still take time (typically anywhere from a few minutes to a day, depending on TTL).
DNS lookup vs. WHOIS
DNS lookup shows technical records — where the domain currently points. That's not the same as WHOIS, which answers a different question: who owns the domain, which registrar it was bought from, and when the registration expires.