View domain DNS records: A, AAAA, MX, NS, TXT
Results
| Type | Name | Value | TTL | Priority |
|---|---|---|---|---|
DNS (Domain Name System) is a system for converting domain names to IP addresses and other records.
A — Server IPv4 address. The main record for linking a domain to a server.
AAAA — Server IPv6 address. The IPv6 equivalent of an A record.
CNAME — canonical name (alias). Indicates that the domain is an alias of another domain.
MX — mail server. Specifies which server should receive mail for the domain. Has priority (lower number means higher priority).
NS — name servers. Indicate which DNS servers serve the domain.
TXT — text record. Used for SPF, DKIM, domain ownership verification, and other purposes.
SOA — start of authority record. Contains DNS zone information: primary server, administrator email, serial number.
TTL — record time-to-live in the DNS server cache (in seconds).
DNS Lookup Online — Domain DNS Record Checking
The tool queries DNS records for any domain: A, AAAA, MX, NS, TXT, CNAME, SOA. Useful for diagnosing email issues, SSL certificates, CDN setup, and domain verification.
DNS Record Types
| Type | Purpose | Example |
|---|---|---|
| A | IPv4 address | 93.184.216.34 |
| AAAA | IPv6 address | 2606:2800:220:1:... |
| MX | Mail servers (with priority) | 10 mail.example.com |
| TXT | Text records: SPF, DKIM, verification | v=spf1 include:... -all |
| CNAME | Alias for another hostname | www → example.com |
How DNS Works
When you enter a domain, the browser checks: local cache → OS cache → local DNS → recursive resolver → root servers → TLD servers → authoritative server. The process takes 50–200ms on first request, milliseconds with caching.
Common Problem Diagnostics
- Email not delivered — check MX records and TXT with SPF/DKIM
- SSL not working — check A/CNAME: domain must point to the server with the certificate
- Site not loading — check A record: is the correct IP set?
Frequently Asked Questions
What is TTL?
Time to Live — how long a record is cached on DNS servers (in seconds). Reduce TTL before migrating to speed up changes.
Why do DNS changes propagate slowly?
After changing a record, you must wait for the old record's TTL to expire worldwide. At TTL=86400, this can take up to 48 hours.
For HTTP headers inspection use HTTP Headers, for Open Graph checking — OG Checker.
Useful articles
WCAG Color Contrast: Website Accessibility Guide
A complete guide to color contrast: WCAG 2.1 standards, AA and AAA levels, calculation formula, practical examples of good and bad contrast, and how to fix accessibility issues.
CSS Border Radius: Rounding Element Corners
How to use border-radius: syntax, shorthand notation, elliptical corners. Online border-radius generator.