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DNS Lookup Tool

The DNS Lookup tool checks common DNS records for a domain, host, or service name. It is useful when you need to verify whether DNS is returning the value your application, mail system, SIP endpoint, or browser expects.

Supported Records

  • A and AAAA for IPv4 and IPv6 address records.
  • CNAME for aliases and hosted app validation.
  • MX and TXT for email routing and policy checks.
  • NS and SOA for authority and zone details.
  • SRV and CAA for service discovery and certificate authorization.

When DNS Lookup Helps

Use it when a domain does not resolve, a hosted service asks you to verify a record, email delivery is failing, a SIP domain needs SRV/NAPTR review, or a migration appears to be serving stale answers.

Quick Notes

  • No answer does not always mean a broken domain.
  • TXT records are often used for SPF, DMARC, DKIM, and ownership checks.
  • For propagation questions, compare public resolvers with DNS Propagation.

How To Read Results

  • A record answer points a hostname to an IPv4 address. AAAA does the same for IPv6.
  • A CNAME answer means the name is an alias. Check the final target if the service still fails.
  • MX answers list mail targets by priority. Lower priority numbers are tried first.
  • TXT answers can be long because SPF, DKIM, DMARC, and ownership checks often live there.
  • NXDOMAIN means the name does not exist from DNS' point of view. No answer means the name may exist, but not for the record type you asked for.

How To Use DNS Lookup Tool

  1. Enter the hostname or domain exactly as the service expects it.
  2. Choose the record type that matches the problem: A or CNAME for websites, MX or TXT for email, SRV for SIP discovery.
  3. Run the lookup and compare the answer with your expected host, IP, or verification value.
  4. If the answer looks old or inconsistent, open DNS Propagation and compare public resolver answers.

Troubleshooting Flow

1. Name 2. Record 3. Answer 4. Follow-up

Example Result

Common A record check example.com / A
93.184.216.34 Status: answer returned
  • Use A for IPv4 website targets.
  • If this returns no answer, try CNAME before assuming the domain is broken.
  • For a recent change, compare this with DNS Propagation.
Suspicious TXT check example.com / TXT
v=spf1 include:_spf.example.net -all google-site-verification=...
  • One SPF record is normal; multiple SPF records on the same name need cleanup.
  • TXT values can wrap across lines in some tools.
  • Use Email Auth Checker when the TXT record controls mail delivery.

What Good And Bad Results Look Like

Good signs
  • The answer matches the expected provider value.
  • The record type matches the service you are testing.
  • Follow-up checks agree when propagation matters.
Needs review
  • NXDOMAIN for a name that should exist.
  • Multiple SPF TXT records on the same hostname.
  • A CNAME target that does not resolve to the expected final service.

Common Mistakes

  • Checking only A records when the hostname is actually a CNAME.
  • Forgetting that TXT records may be split into multiple quoted chunks by DNS tools.
  • Assuming one clean lookup means every resolver has already picked up a recent change.

Practical Troubleshooting Workflow

  1. Start with the exact hostname users or devices are using.
  2. Check the record type tied to the symptom.
  3. Compare the result with the provider or change ticket.
  4. If users disagree, move to DNS Propagation before changing records again.

FAQ

What is the difference between DNS lookup and DNS propagation?

DNS Lookup checks one DNS answer for a record. DNS Propagation compares multiple public resolvers so you can see whether a DNS change is visible consistently or still cached differently.

Why does a DNS lookup return no answer?

No answer usually means that specific record type does not exist for the name. It can also happen when the name is wrong, the zone is not delegated correctly, or the authoritative DNS server is failing.

Which DNS record should I check first?

For websites, start with A, AAAA, or CNAME. For email, start with MX and TXT. For VoIP domains, check SRV and NAPTR records if your provider uses domain-based SIP routing.