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If i am having a wifi modem, who controls the speed of it

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Boggin:
An external IP address is the address your ISP uniquely assigns to you from its range which gives you access to the Internet through your router.

https://www.computerhope.com/jargon/e/externip.htm

A DNS server translates a domain into an IP address for that domain/website regardless of which you use.

https://www.lifewire.com/what-is-a-dns-server-2625854

jraju:
Hi, Thanks boggins for wealth of information.
I asked that because, when i changed to google dns, the external ip alloted to me by ISP was something different in starting numbers. I searched for it. It was a local address and belong to a private medical stores.
How external ips are allotted by ISP. Is it a auto one taken from not logged computers of the same Provider? Or is it the ip of the random automatically selected ?
                 Is it another ? You may remember my query regarding infected ips and login. Does the ip will show you the address of the establishment? Strange. i want to know. Thanks for providing links. i will definitely look in to my knowledge base

Boggin:
No two people have or should have the same external IP address, so it would have to be one that hadn't been allocated.

I find it puzzling that you say the one you were given was for a local store as an ext. IP address uniquely identifies you.

If say someone from that local store was spamming, that IP address could be blacklisted and you would find it difficult to join forums and the suchlike.

It is said that you can get a different ext. IP address whenever you boot up, but the only time mine has changed was when I was directed by my ISP tech support to switch off the router for at least 30 mins, as that would give me a different ext. IP address.

Apparently that can sometimes fix Internet problems.

jraju:
Hi, Boggins, understand.
                    The ip addresss , i mentioned , was checked in ips who com, which gave the address of the medical stores in my local area. so, only i asked , how those are allocated . Is it from other users randomly or from those whose connection is not on?
I find strange in the showing of address in the whois ip or somesort of website. Normally it would only give the domain name and not the name of the actual store or shop.
                      I am getting much interest in knowing.how those external ips are allocated. Is it city wise or state wise or nationwide allocated.

Boggin:
I think you need to take this up with your ISP as to how look up is giving you that address for your ext. IP address as well as how they are allocated in relation to district.

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