If you use BGP then you should know what is AS (autonomous system).
There is a great tool which analysis our AS and search for issues like route leaks, hijacks, bogons, static loops, vulnurable ports, DDoS amplifiers.
I think this tools is must have for network administrators.
No more talking it's time for action:
Radar by Qrator
Example results for Google ASN 15169
There is a short document about Radar by Qrator on NANOG.
Network Explorations with Qrator Radar