DNS Lookup

DNS Lookup is a free online tool for querying domain DNS records. Enter a domain to view common records such as A, AAAA, CNAME, MX, NS, and TXT. It can be used to check DNS configuration, troubleshoot website access problems, and analyze domain network settings.

Key Features of DNS Lookup

• Supports online domain DNS record lookup.
• Supports A, AAAA, CNAME, MX, NS, TXT, and other common records.
• Supports querying a specific DNS record type.
• Shows DNS record values and TTL information.
• Shows the number of DNS records returned.
• Useful for DNS configuration checks and network troubleshooting.

How to Look Up DNS Records?

1. Enter the domain to query, such as example.com.
2. Select the DNS record type to query, or select all records.
3. Click the lookup button.
4. View the returned DNS records, values, and TTL information.

What Is DNS?

DNS (Domain Name System) converts human-readable domain names into IP addresses used for network communication. Different DNS record types can also describe mail servers, aliases, authoritative name servers, and other domain configuration information.

A Record

An A record maps a domain name to an IPv4 address. For example, an A record can point a website domain to an IPv4 address of a server.

AAAA Record

An AAAA record maps a domain name to an IPv6 address. Websites and servers using IPv6 can configure their corresponding IPv6 address through an AAAA record.

CNAME Record

A CNAME record maps one domain name to another canonical domain name. It is commonly used for aliases, CDNs, and third-party service configurations.

MX Record

An MX record specifies the mail exchange servers for a domain. Mail systems use MX records to determine which servers receive email for the domain.

NS Record

An NS record specifies the authoritative DNS servers for a domain. NS records can be used to identify which name servers are responsible for resolving the domain.

TXT Record

A TXT record stores text information and is commonly used for domain ownership verification, SPF, DKIM, and other email or network service configurations.

What Problems Can DNS Lookup Help Solve?

• Check whether a domain resolves correctly.
• Confirm the server IP address associated with a domain.
• Check whether DNS records are configured correctly.
• Troubleshoot website access or DNS resolution problems.
• Check MX records for email domains.
• View authoritative DNS servers.
• Check CNAME configurations for CDNs, aliases, and third-party services.

What Is TTL in DNS Records?

TTL (Time To Live) indicates how long a DNS record may be cached, usually in seconds. When a recursive DNS server caches a record, it can use the cached result until the TTL expires, reducing repeated queries to authoritative DNS servers.

DNS Lookup Considerations

DNS Results May Be Cached

DNS changes do not necessarily become effective immediately across all networks. Because of DNS caching and TTL, different DNS servers may return different results at the same time.

Different DNS Servers May Return Different Results

Recursive DNS, public DNS, and authoritative DNS servers may use different query paths. If a DNS record appears incorrect, comparing results from different DNS services can help determine whether caching or propagation is involved.

A Missing Record Does Not Mean the Domain Does Not Exist

The absence of one DNS record type does not mean the domain cannot be used. For example, a domain may have no MX record while still using A or AAAA records for a website.

Frequently Asked Questions

Which DNS records can be queried?

Common DNS queries include A, AAAA, CNAME, MX, NS, and TXT records. When ALL is selected, the service can return multiple supported DNS record types.

Why has a DNS change not taken effect?

DNS changes can be affected by TTL, local DNS caches, ISP DNS caches, and recursive DNS caches. Results may therefore differ between regions and network environments for some time.

How can I find the IP address of a domain?

Query the A record to obtain the corresponding IPv4 address and the AAAA record to obtain the corresponding IPv6 address. If the domain uses a CDN, the returned IP may belong to a CDN node rather than the origin server.

Is DNS lookup useful for website troubleshooting?

Yes. Checking A, AAAA, CNAME, NS, and other records can quickly determine whether DNS resolution is working and help identify domain configuration, DNS service, or network access problems.

DNS Lookup and Domain Resolution

DNS lookup is the process of retrieving domain resolution information, while domain resolution is the process by which DNS maps domain names to IP addresses or other network service information. DNS lookup provides a direct view of the current domain configuration.