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Check domain DNS records online. Instantly look up A, AAAA, CNAME, MX, and NS records with support for custom DNS servers.
The DNS (Domain Name System) lookup tool helps you quickly view various DNS records for a domain name. It supports querying multiple types such as A records (IPv4 address), AAAA records (IPv6 address), CNAME (alias), MX (mail server), and TXT (text record). You can also choose to query all record types to get complete DNS information at once.
When you need to verify if domain resolution is correct or troubleshoot why a website is inaccessible, typing commands manually can be tedious. The NSLookup tool allows you to enter a domain directly in your browser, simulating command-line operations to query a specified DNS server and return various DNS records for that domain. DNS records are entries in the Domain Name System that point a domain to its associated server IP address or other information, serving as the foundation of internet routing.
Q: What does the TTL value in the query results mean?
TTL (Time to Live) refers to the time (in seconds) that the DNS record remains valid in the local cache. For example, TTL=300 means the record will expire after 5 minutes in the local cache, requiring a new query to the DNS server.
Q: Why is the IP found using this tool different from the ping command results?
This is usually because the DNS server you specified during the query is different from your computer's default DNS, or there is a local DNS cache. This tool queries your specified DNS server directly, returning the latest resolution records from that server, unaffected by your local cache.
Please ensure the domain name format is correct (e.g., "google.com"). If the query result is empty, possible reasons include: the domain has no records of the queried type, the specified DNS server is unreachable, or network latency is too high. For critical business verification, we recommend comparing results from multiple public DNS servers (such as 8.8.8.8 and 1.1.1.1). This tool does not store your queried domains or results.
For IT operations and developers, NSLookup is the go-to tool for diagnosing DNS issues. A typical use case is when a user reports website access issues while it works fine for you locally. You can guide the user to check the A record using this tool and compare the retrieved IP address with the correct server IP. This quickly determines if there is local DNS pollution or a resolution error. For example, querying the A record for "github.com" should normally return a series of GitHub's server IP addresses; if an unfamiliar IP is returned, it is highly likely that DNS hijacking has occurred. Additionally, after migrating servers or changing CDN providers, querying through different DNS servers can verify the propagation status of global DNS records.
