FWIW: IP addresses...I don't think that many person understand just what an IP address is or exactly what it identifies. An IP address is no more "private" than the information in a telephone directory, in fact it is far less able to be linked to any given individual. And, since most of us DHCP...the only information that can be consistenly obtained via monitoring IPs...relates only to those who use static IPs.
"IP addresses can be either static or dynamic. Static IP addresses never change. They serve as a permanent Internet address and provide a simple and reliable way for remote computers to contact you. Static IP addresses reveal such information as the continent, country, region, and city in which a computer is located; the ISP (Internet Service Provider) that services that particular computer; and such technical information as the precise latitude and longitude of the country, as well as the locale, of the computer. Many websites provide IP address look-up services to their visitors, free of charge. If you're curious about your own IP address, you can locate these websites by performing a Google search.
Dynamic IP addresses are temporary and are assigned each time a computer accesses the Internet. They are, in effect, borrowed from a pool of IP addresses that are shared among various computers. Since a limited number of static IP addresses are available, many ISPs reserve a portion of their assigned addresses for sharing among their subscribers in this way. This lowers costs and allows them to service far more subscribers than they otherwise could.
Static IP addresses are generally preferable for such uses as VOIP (Voice over Internet Protocol), online gaming, or any other purpose where users need to make it easy for other computers to locate and connect to them. Easy access can also be facilitated when using a dynamic IP address through the use of a dynamic DNS service, which enables other computers to find you even though you may be using a temporary, one-time IP address. This often entails an extra charge, however, so check with your ISP.
Static IP addresses are considered somewhat less secure than dynamic IP addresses, since they are easier to track for data mining purposes. However, following safe Internet practices can help mitigate this potential problem and keep your computer secure no matter what type of IP address you use."
Above info from http://whatismyipaddress.com/ip-address .
I can get more "personal" information from using the phone book...or Whois...or even just doing a general search...than any IP address using DHCP can ever lead to, IMO.
It's been my experience that often times...those using the Internet...don't really have a solid understanding of just what is going on and how it all occurs. That includes me, but I believe I know/understand enough to never waste one second of time worrying that someone has access to my changing IP address or the IP address of my Internet Service Provider. There are enough valid items in my life to be concerned about...without creating worries about that which doesn't merit my time...that's my perspective on IP addresses .