DNS Doctor checks the records behind a domain, including A, AAAA, CNAME, NS, MX and TXT. It can inspect HTTPS reachability, redirects and certificate expiry, then explain SPF, a DKIM selector you enter and DMARC findings in plain language. Diagnostic DNS queries use the network’s DNS resolver; HTTPS checks contact the domain and redirect destinations. Contains ads.

Enter a domain and run a check when you need to investigate website or email settings. Save domains for quick selection, return to earlier diagnoses and export a text report of your diagnostic history. Results show the records returned by the current network, HTTPS response and redirect details, and the certificate information available during the check. Email findings help you review published policies; a DKIM check needs the selector you supply. These are checks you start yourself. They do not change DNS records, install a VPN, configure mail or guarantee message delivery. Saved history is stored locally.