I second what Harry83 said.
Try DNSstuff.com (if I misspelled, google for dnsstuff) you'll get more than "whois" there. Traceroute, all sorts of cool things.
Port 139 is difficult to stealth, but ZA manages it well. I wouldn't worry about it. Checkout grc.com for info on that port. Or get a router
Every five minutes? Well, it could be your ISP or your mail server (most likely), or random traffic, or China Telecom - they always want to hack you