That&#x27;s what I thought - but it turns out that not all ISPs behave well.<p><a href="https:&#x2F;&#x2F;defcon.org&#x2F;images&#x2F;defcon-22&#x2F;dc-22-presentations&#x2F;Graham-McMillan-Tentler&#x2F;DEFCON-22-Graham-McMillan-Tentler-Masscaning-the-Internet.pdf" rel="nofollow">https:&#x2F;&#x2F;defcon.org&#x2F;images&#x2F;defcon-22&#x2F;dc-22-presentations&#x2F;Grah...</a> but the video is also very entertaining. This is applicable to the IPv4 internet but I&#x27;m sure someone will eventually come up with a way to do it for IPv6.