Check your domain
Find DNS, email, SSL, redirect, and domain configuration problems. Get the simple answer first, with raw technical evidence when you need it.
See pass, warning, or fail before the raw records.
DNS, TLS, HTTP, and RDAP checks run when requested.
We do not build profiles or store checked-domain histories.
Start with the problem you are solving
Each page focuses on one search intent while sharing the same diagnostic engine and result language.
SPF Checker
Check a domain's SPF record, validate common problems, and understand what the policy means.
Open tool 02SSL Certificate Checker
Inspect certificate validity, hostname matching, expiration, issuer, and TLS details.
Open tool 03DMARC Checker
Validate a domain's DMARC policy, reporting destinations, alignment, and enforcement level.
Open tool 04DKIM Checker
Retrieve and validate the DKIM public key published for a domain and selector.
Open tool 05Redirect Checker
Trace each HTTP redirect, reveal the final destination, and detect loops or excessive chains.
Open tool 06Domain Lookup
View structured registration, registrar, status, dates, and nameserver data from RDAP.
Open toolUseful to owners. Detailed enough for engineers.
SPF configuredGoogle Workspace appears authorized to send mail. No obvious SPF errors detected.
v=spf1 include:_spf.google.com ~allMechanisms, qualifiers, TTL, and lookup evidence remain available.
Eight focused ways to inspect a domain
Understand what your results mean
How to Check SSL Certificate Expiration
Check the certificate your website is serving and understand the 2026 200-day validity limit.
Read the guide →Email authenticationDMARC p=none vs p=quarantine vs p=reject
Understand what each DMARC policy requests and what changed in the current standard.
Read the guide →