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What is an NS Lookup?
NS Lookup retrieves the Name Server (NS) records for a domain - the authoritative DNS servers responsible for answering queries about that domain. Every domain must have at least two NS records for redundancy.
Why would I need to check NS records?
Common reasons include: verifying DNS propagation after migrating to a new DNS provider, confirming which DNS host controls a domain, troubleshooting DNS resolution failures, and conducting security analysis (unauthorized NS changes are a key indicator of domain hijacking).
What is the difference between NS records and a WHOIS nameserver entry?
WHOIS shows the nameservers registered with the domain registrar - what the registry thinks the nameservers are. NS records come from DNS itself - what the internet actually resolves. These should match; a discrepancy may indicate a misconfiguration or hijack attempt.
How many nameservers does a domain typically have?
Most domains have 2–4 nameservers. Using multiple nameservers provides redundancy - if one fails, others continue to answer queries. Enterprise and high-traffic domains often use 4+ nameservers across geographically distributed locations.
Can NS Lookup help detect domain hijacking?
Yes. Unexpected changes to NS records are one of the primary indicators of domain hijacking. Regularly monitoring NS records for your owned domains and alerting on changes is a recommended security practice.
What is the TTL on NS records and why does it matter?
TTL (Time-To-Live) determines how long DNS resolvers cache the NS record before re-querying. A lower TTL means faster propagation of changes but higher query load; a higher TTL is more stable but slows down migrations. Typical NS TTLs range from 3,600 to 86,400 seconds.
