NS Lookup
Query DNS servers for name and address records of a domain.
About NS Lookup
What is DNS Lookup (NSLookup)?
NSLookup (Name Server Lookup) queries the Domain Name System to find the IP address associated with a domain name, or to retrieve other DNS records like MX, CNAME, TXT, and NS records. DNS is the internet's phone book, translating human-readable domain names into machine-readable IP addresses.
Why We Built This Tool
DNS troubleshooting is one of the most common tasks for DevOps engineers and system administrators. Whether you are verifying DNS propagation after a migration, checking MX records for email delivery, or debugging CDN configuration, this tool provides instant DNS lookups without needing command-line access.
How to Use It
Enter a domain name (e.g., example.com) and click Lookup. The tool queries DNS servers and returns all available record types: A (IPv4 address), AAAA (IPv6 address), CNAME (canonical name), MX (mail exchange), NS (name servers), TXT (text records, often used for SPF/DKIM/DMARC), and SOA (start of authority).
DNS Record Types Explained
A records map a domain to an IPv4 address. AAAA records map to IPv6. CNAME records alias one domain to another. MX records specify mail servers with priority values. NS records indicate authoritative name servers. TXT records store arbitrary text, commonly used for domain verification, SPF email security, and DKIM signatures. SOA records contain zone administration information.
Common Use Cases
Verifying DNS propagation after changing nameservers, debugging email delivery by checking MX and SPF records, confirming SSL certificate domain validation via TXT records, checking CNAME configuration for CDN and load balancer setups, and auditing DNS security with DMARC and DKIM records.