Blog
Practical guides and data reports on DNS, domains, hosting, SSL, website technology and email security.
How to Troubleshoot SSL Handshake Failures Caused by Outdated DNS Records
Learn how to troubleshoot SSL handshake outdated DNS errors quickly. Fix mismatched IP addresses, expired certificates, and broken secure connections.
What is Nameserver Lookup and How to Change NS
Learn what an ns lookup is, how nameservers work, and step-by-step instructions on changing your NS records to point to a new web host.
How to Perform a Comprehensive DNS Lookup
Master the dns lookup process to troubleshoot records, verify propagation, and fix network issues with expert commands, examples, and a free online tool.
A Receiver's Guide: How MX Records Interact with A and AAAA Records
Master the relationship between MX record vs A record email routing. Learn exact DNS syntax, troubleshooting commands, and how mail delivery works.
What Is an SOA Record in DNS Configuration?
Learn what an SOA record is in DNS configuration, how it works, its specific fields, and how to perform an SOA lookup to troubleshoot zone issues.
What Is a CAA Record and Why Your SSL Needs It
Learn what a CAA record is, how it protects your domain from unauthorized SSL certificates, and how to verify your setup using a free CAA lookup tool.
What Is a TXT Record and How to Validate It
Learn what a DNS TXT record is, how it secures email and domains, and follow step-by-step instructions to create, add, and validate records.
How to Look Up Nameservers for Any Domain
Learn how to perform an NS lookup to find nameservers for any domain using command-line tools, online utilities, and DNS query techniques.
What Is DNSSEC and How to Check If It Is Enabled
Learn what DNSSEC is, how cryptographic signatures protect your domain from hijacking, and how to verify implementation using a free dnssec checker.
How to Check Domain Expiry Date Before It Drops
Learn how to use a domain expiry checker to find when domains expire, track registration dates, and secure valuable web addresses before they drop.
How to Use a Subnet Calculator for Network Design
Master network design with our guide on using a subnet calculator. Learn IP subnetting, CIDR blocks, and subnet masks with practical examples.
What Is an ASN Lookup and How to Find Autonomous System Numbers
Learn what an Autonomous System Number is, why it matters for network routing, and how to perform an ASN lookup to troubleshoot connectivity.