Check if IP address is in use, deny registration

[Jennifer2010]

Originally Posted by snakes1100

That would be incorrect, comcast & charter IP's are not static unless you pay for them.

Comcast is as simple as unplugging the modem, waiting about 10 minutes, then repower it, your IP will change, it technically stays the same ip for a few months based on comcasts own comments, but beyond that, your ip isnt static, it is dynamic & it will change.

I disagree. For the Comcast cable connection I've had since 2007, my IP has changed maybe 3 times. Before that, when I lived in Wisconsin, my connection with Charter was also static and never changed.

I actually called Comcast about a year ago to ask them if I'm able to change my IP (I wanted to change it) and they told me no. They did, however, tell me that new Comcast customers are set up on a different system than old ones - and get dynamic IP addresses. This was surprising to me.

From what I see based on my own experience, the members on my forum (with their IP's resolving to cable company hostnames) - most cable connections are STATIC here in the US.

Another example: We have a GeoIP script on about 5 of our WordPress sites that redirects users based on the state they're in (including the one I live in, and my business partner's). To get around this, we add our IP addresses to a white list. They've been there for over 2 years, and neither I or my business partner has had to change the IP whitelist.

I've also had customers in these states that I had to whitelist - and for as long as they've been members, they've never had to email me again to get re-whitelisted under a different IP.

Also, on my dedicated server the only IP whitelisted to access via ftp/ssh/whm is mine - so if my IP ever changed, I wouldn't be able to log in via ssh/ftp and I'd be forced to go through the WHM security questions - which I've never had to do since I've had the server since 2010.

And to really make my point concrete, we have an account sharing violation on our Wordpress membership sites that state no user can ever log in from multiple IP addresses. In the last 2 years, we've had well over 10,000 members and maybe 10 times have had to deal with multiple IP's accessing accounts - which all were from sharing violations.

MOST IP's are static. The only non-static IP's are noticed are from dial up and DSL services, and a small amount from cable services - primarily in Europe.

I've reset my Comcast modem a million times and it never reset my IP.