What This Tool Checks
HeaderCheckr performs a single lookup for A, MX, and TXT records on the hostname you enter.
Network
DNS Lookup
Look up A, MX, and TXT records for a public domain.
Guide
DNS Record Checks
DNS records tell browsers, mail servers, and third-party services where a domain points and how it should be verified.
Use this lookup when a site, email setup, or provider verification does not behave the way you expected.
Why It Matters
A records usually point web traffic, MX records route email, and TXT records support verification, SPF, DKIM, DMARC, and provider checks.
DNS mistakes can look like website, email, or SSL problems, so a quick record check is often the fastest place to start.
Related Tools
After checking DNS, inspect SSL certificate health, redirect chains, and security headers.
FAQ
Does this check DNS propagation?
No. This is a simple current lookup for A, MX, and TXT records, not a global propagation monitor.
What is an A record?
An A record points a hostname to an IPv4 address, often for website or app traffic.
Why are TXT records so long?
TXT records often contain verification tokens or email security policies such as SPF, DKIM, and DMARC.