Quick checks for domains, DNS and email deliverability. Enter a domain, IP or host in any tool to get started.
Get an A-F grade for your domain's email security and deliverability, with a free report on how to fix every issue.
All the common DNS records for a domain, with email (SPF, DKIM, DMARC) and Microsoft 365 checks.
Follows every include, counts the real DNS lookups against the limit of 10, flags void lookups and builds a flattened record.
Tries 100+ common selectors to find which DKIM keys a domain publishes, the sending provider and the key length.
Builds a correct DMARC record, explains every tag, and checks external report addresses are authorised.
Checks PTR records for an IP, host or a domain's mail servers, and confirms forward and reverse DNS match.
Checks an IP, or a domain's web and mail server IPs, against the major spam blacklists.
Is a domain registered, expired, parked or for sale? Uses RDAP, nameservers and the home page.
Paste an email's headers to see its route and delays, SPF/DKIM/DMARC results and why it went to junk.
WordPress version, theme and plugins compared with the latest releases, plus common security exposures.
CMS, hosting, CDN, web server, analytics, ad pixels, chat and consent tools used by any website.
Title, description, headings, canonical, indexing, social tags, images, links and schema for any page.
Can search engines crawl the site? Validates robots.txt and XML sitemaps and tests individual URLs.
Google Ads, GA4, GTM (including container contents), Meta, Microsoft UET and LinkedIn tags on a page.