DNS Lookup

DNS records map a name to data. An A record is an IPv4 address, AAAA is IPv6, CNAME is an alias, MX is mail, and TXT is text. TTL is how long a resolver may cache the row. This table shows those columns without a lookup.

Use the tabs to learn what each record type is for, then query a resolver you trust when you need the real answer. 192.0.2.0/24 and 2001:db8::/32 are reserved for documentation, which is a clue that the A and AAAA rows were not looked up.

A is one of the values DNS Lookup puts on screen. An A record maps a name to an IPv4 address. The sample lists 192.0.2.1 and 192.0.2.2, both with TTL 300. 192.0.2.0/24 is TEST-NET-1, a documentation block, not a hosting address for the domain you typed.

Read AAAA on its own before you mix it with the other rows. An AAAA record maps a name to an IPv6 address. The row is 2001:db8:85a3:0:0:8a2e:370:7334 with TTL 300. 2001:db8::/32 is the documentation prefix. It is not the site’s IPv6.

MX answers a narrower question than the headline number. MX records name mail hosts and a preference number. The sample shows 10 mail.example.com and 20 mx2.example.com, TTL 3600. Those hostnames are placeholders. They are not the domain’s mail exchangers.

Treat TXT as a label with a specific job. TXT records carry text such as SPF or a site-verification token. One row is v=spf1 include:_spf.google.com ~all and another is google-site-verification=xyz123, TTL 3600. The verification token xyz123 is fake. Do not conclude the domain uses Google Workspace.

The NS and CNAME line is worth a full stop. NS names the delegated nameservers. CNAME aliases one name to another. NS rows are ns1.cloudflare.com and ns2.cloudflare.com with TTL 86400. The CNAME aliases www to the domain you typed, TTL 3600. A domain can be delegated anywhere. This Cloudflare pair is the fixture, not a detection.

A URL is reduced to the hostname. A name without a dot is rejected. Switching tabs does not send a new query. It only shows another slice of the same fixture.

If you remember one sequence from DNS Lookup, remember the fields in the order they change a decision. A matters because An A record maps a name to an IPv4 address. In practice, The sample lists 192.0.2.1 and 192.0.2.2, both with TTL 300. The mistake to avoid is this: 192.0.2.0/24 is TEST-NET-1, a documentation block, not a hosting address for the domain you typed. AAAA matters because An AAAA record maps a name to an IPv6 address. In practice, The row is 2001:db8:85a3:0:0:8a2e:370:7334 with TTL 300. The mistake to avoid is this: 2001:db8::/32 is the documentation prefix. It is not the site’s IPv6. MX matters because MX records name mail hosts and a preference number. In practice, The sample shows 10 mail.example.com and 20 mx2.example.com, TTL 3600. The mistake to avoid is this: Those hostnames are placeholders. They are not the domain’s mail exchangers. TXT matters because TXT records carry text such as SPF or a site-verification token. In practice, One row is v=spf1 include:_spf.google.com ~all and another is google-site-verification=xyz123, TTL 3600. The mistake to avoid is this: The verification token xyz123 is fake. Do not conclude the domain uses Google Workspace. NS and CNAME matters because NS names the delegated nameservers. CNAME aliases one name to another. In practice, NS rows are ns1.cloudflare.com and ns2.cloudflare.com with TTL 86400. The CNAME aliases www to the domain you typed, TTL 3600. The mistake to avoid is this: A domain can be delegated anywhere. This Cloudflare pair is the fixture, not a detection. After that, the checks are simple. You noticed 192.0.2 and 2001:db8 before copying an address. You did not treat the Cloudflare NS rows as a detection. You did not treat the SPF string as the live mail policy. You used a resolver for any record you will publish. A URL was reduced to a host, and a name without a dot was rejected.

Keep DNS Lookup as this step only. When the job moves on, the SEO Audit Tool is the next page: SEO Audit Tool sends the URL you enter to the iSkills server, which fetches that page and returns on-page checks plus a PageSpeed request. The Page Size Checker covers a different piece of the same work: Page Size Checker asks for a URL and then shows a total kilobyte figure plus a split across HTML, images, scripts, and CSS.