There are a number of reasons for which you might find yourself unable to access a URL, or website address. Whether your network administrator has blocked access to certain sites or you live in a country, such as China or Iran, whose government controls its citizens' Internet privileges, the process of unblocking blocked websites is straightforward—you can do it right on the web, without downloading or installing any software, using a tool known as a "web-based" proxy. Since entities block websites via their "Internet protocol" (IP) addresses, a "proxy" works by "masking" your IP and giving you a new one.
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Point your web browser to a web-based proxy (See Resources.) Enter the blocked URL in question into the "Address" field.
Click "Enter" and wait a moment. Your website will appear before you. To access a different blocked website, you'll need to enter its address into the proxy "Address Bar" that will appear at the top of your window—not that of your own web browser.