DNS Lookup Checker for Domains & DNS Records

A DNS Lookup Checker is an online tool that queries publicly available DNS records for a domain or subdomain. It can show A, AAAA, CNAME, MX, TXT, NS, SOA, and CAA records, along with TTLs, nameservers, mail routing, and other visible DNS information. WRanker also provides related SPF, DMARC, and selector-based DKIM context where supported.

Enter the domain or subdomain into the DNS Lookup Checker, select the DNS record type you want to inspect, and run the lookup. Use A or AAAA records to check IP addresses, NS for nameservers, MX for mail servers, and TXT for verification or email-related records. WRanker can also display related DNS context such as TTLs, mail records, and nameserver information.

You can use a DNS record checker to look up common public DNS records including A, AAAA, CNAME, MX, TXT, NS, SOA and CAA. These records can reveal IP addresses, aliases, mail servers, verification values, authoritative nameservers, zone information, and certificate-authority policies. The record type you select should match the DNS issue or configuration you want to investigate.

Yes. You can look up DNS records for specific subdomains such as www.example.com, mail.example.com, or _dmarc.example.com, as well as the root domain. Subdomains can have different A, AAAA, CNAME, MX, TXT, and other DNS records from the parent domain, so always check the exact hostname you need to investigate.

Run an A-record lookup to find the IPv4 addresses published for a hostname, or an AAAA lookup to check IPv6 addresses. If the hostname points to a CNAME, DNS resolution may follow that alias before reaching an address record. When a CDN or proxy is used, the public DNS result may show the network's edge IP rather than the website's private origin server.

Run an NS-record lookup to find the authoritative nameservers published for a domain. These nameservers identify the DNS servers responsible for providing authoritative answers about the domain's DNS records. Domains commonly use multiple nameservers to improve availability and resilience.

A DNS provider lookup can often provide clues about the service managing a domain by examining its authoritative nameservers and related public DNS signals. Provider-branded nameservers may make the DNS service easy to recognise, but custom or white-labelled nameservers can make identification less certain. Treat provider identification as evidence from public DNS data rather than proof of account ownership.

Yes. MX records identify the mail servers that receive email for a domain, while SPF policies are typically published in TXT records. DMARC is normally checked at a hostname such as _dmarc.example.com, and DKIM requires a selector under a hostname such as selector._domainkey.example.com. WRanker supports MX and TXT context, SPF and DMARC hints, and selector-based DKIM checks where available.

DNS lookup tools can show different results because they may use different recursive resolvers with different cached DNS answers. After a DNS change, one resolver may already have the new record while another continues serving an older cached value until its TTL expires. Resolver caching, negative caching, and the timing of DNS changes can therefore cause temporary differences between tools.

TTL, or Time to Live, tells DNS resolvers how long they can cache a DNS record before requesting it again. A longer TTL can improve lookup efficiency because cached responses are reused for longer, but DNS changes may also take longer to appear for users with an existing cached record. A shorter TTL allows cached values to expire sooner, although changing the TTL does not immediately remove records already cached under the previous setting.