Free website checks

One question each, answered from one lookup each, in plain words. Read-only, no account, nothing changed on the site. Every one is a check Stackbrace makes for the sites it watches every day.

• DMARC checker

  Enter a domain and see its DMARC record, what its policy does, and what to change. One DNS lookup, nothing sent to the site.

• SPF record checker

  Enter a domain and see its SPF record, which services it lets send mail in its name, and whether receivers can actually use it.

• SSL certificate expiry checker

  Enter a domain and see when its certificate expires, who issued it and whether browsers trust it. One secure handshake with the site, like a browser makes.

• Domain expiry checker

  Enter a domain and see when it expires, where it is registered and whether it is locked. From the registry's RDAP or WHOIS records, nothing sent to the site.

• Who hosts this website?

  Enter a domain and see who serves its DNS, where its mail goes, and whose servers its addresses belong to. DNS lookups only.

• WordPress version checker

  Enter a domain and see whether it runs WordPress and whether it gives its versions away in its page source. Two page fetches, like a visitor makes. The versions themselves are shown only to the site's owner, in Stackbrace.

• Security headers checker

  Enter a domain and see which browser protections its homepage sends, and what to add. One page fetch, like a visitor makes.

For the whole picture of one site at once, the four areas and what stood out, use the full check.