For Web Professionals
DNS Record Lookup Tool
A professional tool to easily check DNS record information for domain names. Supports major record types including A, AAAA, NS, MX, CNAME, TXT, and more.
Record Type Reference
| Record Type | Description |
|---|---|
| A Record | The A (Address) record maps an IPv4 machine to a domain IP address. |
| AAAA Record | The AAAA (Address) record maps an IPv6 machine to a domain IP address. |
| CNAME Record | The CNAME record defines an alias that refers to a canonical name. It delegates records to reference an alias for a specific hostname. |
| MX Record | The MX record defines the mail server hostname for email delivery to the target domain. |
| NS Record | The NS record defines the name server that manages zone information. |
| TXT Record | The TXT record defines text information (string) associated with a hostname. It includes authentication information for spam prevention. |
What is DNS? A Beginner's Guide to Domain Name System
Basic Concepts of DNS
DNS (Domain Name System) is a system that manages the correspondence between domain names and IP addresses used on the Internet. It converts domain names (e.g., example.com) to numerical IP addresses (e.g., 192.0.2.1), which is why it is often called the "phone book of the Internet".
- Benefit: Humans can access websites and mail servers using easy-to-remember text strings
- Mechanism: Information such as IP addresses is obtained by hierarchically traversing name servers
Relationship Between DNS and SEO
- Fast Response: Properly configured DNS contributes to improved site loading speed, making it easier to receive higher evaluations from search engines.
- Reliability: Correct DNS settings reduce downtime and enable stable site operation. Stability also affects usability and SEO factors.
What are Name Servers (NS Servers)
Name servers are the core servers of DNS that store and provide the correspondence information between domain names and IP addresses.
- Configuration Points:
- Typically, at least two name servers are specified for redundancy
- When using a new hosting service, it may be necessary to change the name server settings
- SEO Perspective:
- Slow responses from name servers can cause delays when search engine crawlers read your site
- Choosing stable and fast name servers improves crawlability
Types and Roles of DNS Records
A Record (Address Record)
- Overview: Links domain names to IPv4 addresses
- Key Point: Essential for website display and server connections
MX Record (Mail Exchange Record)
- Overview: Determines mail delivery destinations
- Key Point: Multiple mail servers can be configured with priority settings. Essential information for email operations
CNAME Record (Canonical Name Record)
- Overview: Record for setting aliases
- Key Point: Used for domain forwarding and subdomain operations to organize domain structure
TXT Record
- Overview: Registers text information such as SPF and DKIM for email authentication and domain ownership verification
- Key Point: Also used for security measures and SEO-related verifications (such as Google Search Console)
AAAA Record
- Overview: Associates IPv6 addresses with domain names
- Key Point: IPv6 support is emphasized in modern network environment development and may affect future SEO evaluations
DNS Configuration Best Practices
- Login to Domain Registrar or DNS Hosting Service
- Access the settings panel to edit DNS records
- Backup Records Before Changes
- Prepare for potential configuration errors or service disruptions
- Adjust TTL (Time To Live)
- Set shorter TTL before changes to reduce propagation time
- Consider DNSSEC and DNS over HTTPS
- Enhance security with tamper protection and privacy measures
About DNS Propagation Time
- Changes may take several hours to 48 hours to propagate worldwide
- Plan ahead for urgent site migrations or mail server changes
DNS Resolution Process
- Check Local Cache
- Query ISP DNS Resolver
- Query Root Name Servers to TLD Servers
- TLD Server to Domain Name Server
- Cache Retrieved IP Address for Future Fast Access
- Key to Speed: Efficient caching and stable operation of nameservers
- SEO Benefits: Reduced access delays improve usability and crawler efficiency
DNS Troubleshooting
- Clear DNS Cache
- Clear browser and OS cache to fetch latest information
- Use Alternative DNS Servers
- Test with Google Public DNS (8.8.8.8) to isolate issues
- Check Domain Expiration
- Verify domain registration status and renewal dates
- Verify DNS Record Settings
- Double-check record configurations and values
Using the DNS Record Lookup Tool
Our DNS Record Lookup Tool allows you to check all DNS records (A, MX, TXT, etc.) associated with a domain at once. Regular checks help with early problem detection and contribute to stable website and email operations.