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When I visit a web site, can the server identify me?

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Summary: A server can easily identify any users that visit their web sites. However, there are services that will allow you to surf anonymously.

When I visit a web site, are they able to identify my IP address? If so, how can I block them from being able to identify me?

Yes they can, and it's very easy. In fact I was able to tell what IP address you posted your question from, and from there, what school you're attending.

IP addresses are a fundamental part internet communication, and there's no way to remove that information. When two computers talk on the internet, they know each other's IP addresses. That's the way it works.

One way to surf anonymously is to use an service that routes your requests through its servers. http://www.anonymizer.com/ is one example, though there are others that will do the job. Your IP is still known to the service, but the web site you then visit using the service doesn't see it.

Article C2237 - December 1, 2004

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Recent Comments
60 Comments

Hello Leo,
If I am visiting someone's blog and they have SITEMETER attached to their blog (and lets just say for the sake of my email to you, they have the "advanced sitemeter") are they able to LOCATE ME PERSONALLY through sitemeter..i.e., are they able to find an ISP number and then locate me?

They can get your IP address (as I did with your comment), but as I've said in several articles on the site, you cannot get someone's exact physical location from an IP address.
- Leo
24-Mar-2009

Posted by: Amy Park at March 23, 2009 7:04 PM

Hello,
By mistake i completed a questionnaire page before applying for a job on the internet. The questionnaire asked for my basic info name, address, e-mail.. Since then I get over 100 junk e-mails a day. Is there a way to stop this? Also, what would be the easiest way to learn how to create a website, w/e-mail set up etc.? I appreciate your comments.

Posted by: Gabriela at April 5, 2009 12:34 AM

i was acting stupid in a chatroom i got banned and they said they have my ip adress and they might contact my internet provider help will they actually contact

Posted by: nicole at June 8, 2009 6:56 PM

Someone from within my company has managed to id me via an anonymous site for posting company reviews. Considering all comments are anonymous, is this possible (and if so how) or is this person bluffing? They seem to know my name and exactly which comments I posted.

Posted by: bean at September 29, 2009 2:52 PM

Great information on here. While I understand from the article that a host can easily identify an IP addresses are easily visible by hosts, I just want to clarify: if I visit a website, will he know that, for example, "someone named Josh XXXX spent 12 minutes reading my blog entry and then downloaded my new song"?

Posted by: Josh at November 21, 2009 3:38 PM

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