&gt; There, it gets a find, because &quot;com.com&quot; has a resolver which reports a find for anything of the form &quot;*.com.com.&quot;, leading, of course, to a page of ads.<p>There&#x27;s a few insane SLDs, such as &#x27;uk.com&#x27;, (operated by centralnic - though owned by demys) which responds with an A record for any unknown query, that should result in an NXDOMAIN. The webserver at that record has a link to buy the domain from centralnic, and a bunch of chinese language ads from Baidu.<p><pre><code>  $ for RAND in $(uuid -n 10); do QUERY=&quot;$(uuid).${RAND}.$(uuid).uk.com&quot;; echo &quot;searching for ${QUERY}&quot;; dig +short $QUERY; done
    searching for dc39f90a-a4aa-11e5-92e9-1c872c602432.dc39e492-a4aa-11e5-9d09-1c872c602432.dc3a0ba2-a4aa-11e5-b8dd-1c872c602432.uk.com
    205.164.14.88
    searching for dceaa728-a4aa-11e5-ad0a-1c872c602432.dc39e50a-a4aa-11e5-9d0a-1c872c602432.dceab920-a4aa-11e5-81a4-1c872c602432.uk.com
    205.164.14.88
    searching for dcf0df9e-a4aa-11e5-8613-1c872c602432.dc39e51e-a4aa-11e5-9d0b-1c872c602432.dcf0f218-a4aa-11e5-8abf-1c872c602432.uk.com
    205.164.14.88
    searching for dcf95dcc-a4aa-11e5-a599-1c872c602432.dc39e532-a4aa-11e5-9d0c-1c872c602432.dcf970be-a4aa-11e5-b099-1c872c602432.uk.com
    205.164.14.88
    searching for dcffa6c8-a4aa-11e5-81ac-1c872c602432.dc39e53c-a4aa-11e5-9d0d-1c872c602432.dcffba8c-a4aa-11e5-884c-1c872c602432.uk.com
    205.164.14.88
    searching for dd45fa4c-a4aa-11e5-82d0-1c872c602432.dc39e546-a4aa-11e5-9d0e-1c872c602432.dd460d0c-a4aa-11e5-a519-1c872c602432.uk.com
    205.164.14.88
    searching for ddacda6e-a4aa-11e5-89ba-1c872c602432.dc39e55a-a4aa-11e5-9d0f-1c872c602432.ddaced42-a4aa-11e5-913c-1c872c602432.uk.com
    205.164.14.88
    searching for ddb4995c-a4aa-11e5-bc63-1c872c602432.dc39e564-a4aa-11e5-9d10-1c872c602432.ddb4abfe-a4aa-11e5-9f73-1c872c602432.uk.com
    205.164.14.88
    searching for ddba4a82-a4aa-11e5-bb77-1c872c602432.dc39e56e-a4aa-11e5-9d11-1c872c602432.ddba5dce-a4aa-11e5-92cc-1c872c602432.uk.com
    205.164.14.88
    searching for ddc08ece-a4aa-11e5-80da-1c872c602432.dc39e582-a4aa-11e5-9d12-1c872c602432.ddc0a3b4-a4aa-11e5-b2b4-1c872c602432.uk.com
    205.164.14.88</code></pre>