How to report 38 port scans in 1 week from (part of

Hi folks,

I know that getting port scanned is nothing unusual but I've gotten scanned 38 times in the last week from this one IP ( A whois reports the IP as belonging to DoD Network Information Center in Columbus Ohio.

I send an e-mail to the contact in the whois record asking them to take action after the first day of active scans (20 scans).

Any suggestions as to how one would report this and who to report this to?