An IP address is a string of numbers that is unique to each resource that is connected to the Internet, such as a computer. IP addresses have two principal functions: identifying hosts or network interfaces and location addressing. Although they are stored as binary numbers, IP addresses are usually displayed in notations that are readable by humans. An example of an IP address is 165.23.656.1.

The other way you could profit off expired domain names is redirecting the traffic to your affiliate link. For illustration, if you have an affiliate link that sells beauty products, and the expired domain name was mentioned or ranked in a high authority website for terms related to beauty products you can redirect the traffic there to make sales. One sale is enough to make you a decent profit.
Searching for a suitable domain name for your website can be quite trying. The reason for this is that the names that you want to get have already been assigned and are not available. As an SEO you know the importance of getting a domain name that describes your business as closely as possible. For example, if you are running a car rental service, you will look for a domain name that has the words ‘car’ and ‘rental’ in it. So if you can’t find a suitable name, you could use the expired domains tool which might show you domain names that would meet your requirements.
I am really new to all this. I am about to launch my blog in the next week. I have a domain and a wordpress blog set ready to go. Clearly it will have no traffic from day one and I guess it will take a while to build up. So my question is would you advise a begginer like me to stick with the one blog for a while and build it up. Or is it worth investing the time early on to master how to find expired domains and link them to the blog?

The second option requires a bit more time and effort than a 301 redirect. You could do a mini overhaul of the site and turn it into a microsite for your main domain. This option is good for exact-match domains for your targeted keyword, and there are other reasons for going the microsite route that Rand's highlighted in his post about root domains, subdomains, subfolders and microsites. This strategy also works better if the old domain has decent rankings for the keywords you're targeting. 

A brand new domain, for instance, will have to wait for a few days before getting indexed by Google and other search engines, and then its owner will need to go through the tedious process of search engine optimization, which takes time and financial resources. High authority expired domain names on the other hand, offer a short cut and allow you to get down to business straight away.
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