DNS Checker
DNS Records Guide
A Record
Maps domain to IPv4 address.
example.com. IN A 93.184.216.34Points example.com to IP 93.184.216.34
Use case: Website hosting, server mapping
CNAME Record
Creates domain alias.
www.example.com. IN CNAME example.com.Makes www.example.com point to example.com
Use case: Subdomain setup, CDN integration
MX Record
Specifies mail servers.
example.com. IN MX 10 mail.example.com.Routes email to mail.example.com with priority 10
Use case: Email service setup
Common DNS Issues
Propagation Delay
DNS changes not visible immediately
Symptoms:
- Old IP still resolving
- Website unreachable
- Email delivery issues
Solution:
Wait for DNS propagation (usually 24-48 hours)
Prevention:
Plan DNS changes in advance, use lower TTL before changes
Incorrect Configuration
Misconfigured DNS records
Symptoms:
- Website showing error page
- Email not working
- SSL certificate issues
Solution:
Verify record syntax and values
Prevention:
Double-check records, use DNS validation tools
Missing Records
Required DNS records not set up
Symptoms:
- Services not working
- Verification failures
- Security warnings
Solution:
Add all required DNS records
Prevention:
Follow service provider's DNS setup guides
Troubleshooting Guide
Basic Checks
- •Verify domain registration is active
- •Check nameserver configuration
- •Confirm DNS record values
Tools to Use
- •dig or nslookup for DNS queries
- •DNS propagation checkers
- •Online DNS validation tools
Best Practices
- •Keep records documented
- •Use appropriate TTL values
- •Regular DNS health checks