Netzwerk
DNS Lookup
The DNS lookup tool queries the DNS system for any domain name and displays the returned records for any record type including A, AAAA, CNAME, MX, TXT, NS, SOA, PTR, and SRV. It is the browser-based equivalent of dig or nslookup, allowing developers and sysadmins to verify DNS configurations, troubleshoot propagation issues, and inspect email routing without leaving their browser.
What is DNS Lookup?
DNS (Domain Name System) is the distributed system that maps human-readable domain names to IP addresses and other network resources. A DNS lookup queries this system for records associated with a domain. Different record types serve different purposes: A records map a domain to an IPv4 address, AAAA records to IPv6, MX records specify mail servers, TXT records carry arbitrary text used for SPF, DKIM, and DMARC policies, and CNAME records define aliases to other domain names.
How does it work?
Enter a domain name and select the record type you want to query. The tool sends the query to a DNS-over-HTTPS (DoH) resolver and displays the complete response including all returned records, their TTL values, and the authoritative name server. You can query multiple record types in sequence to build a full picture of a domain's DNS configuration. Results include TTL values that indicate how long records are cached by resolvers.
Typical Use Cases
- Verifying that a new A record has propagated after a DNS change
- Checking MX records to troubleshoot email delivery problems
- Inspecting TXT records for SPF, DKIM, and DMARC email authentication policies
- Confirming that a CNAME points to the correct target host
Step-by-step Guide
- Step 1: Enter the domain name you want to query.
- Step 2: Select the DNS record type (A, AAAA, MX, TXT, CNAME, NS, etc.).
- Step 3: Click Lookup to send the DNS query.
- Step 4: Review the returned records, values, and TTL information.
Example
Input
example.com, record type: MX
Output
MX 10 mail.example.com. (TTL: 3600)
Tips & Notes
- Check the TTL of records before making changes — a low TTL (300s) means changes propagate faster.
- Use TXT record queries to verify SPF, DKIM, and DMARC configuration for email deliverability.
- Query the NS record first to identify the authoritative name servers, then query them directly for the most current data.
Frequently Asked Questions
Why do I get different results for the same domain in different locations?
DNS responses can vary by geographic region due to GeoDNS, anycast routing, or resolver caching. A query from one network may be served by a different anycast node than a query from another. Use a global DNS checker to see results from multiple regions.
What is a TTL in DNS?
TTL (Time to Live) is the number of seconds a DNS record can be cached by resolvers before they must re-query the authoritative server. A lower TTL means faster propagation of changes but more load on your DNS servers.