We are a LauncHUB funded Startup that focuses on big data research of domain names and Whois information. SEO experts can use our unique system for finding expired domains with authority and backlinks. Investigators can use the same database to find information for domain owners and hosts with Reverse Whois and Reverse IP tools. We can also offer brands trademark monitoring in the vast pool of ccTLD domain names.
Ultimately, I was left with a semi-automated process of scraping sites and running an intricate series of processes to come up with a list of expired domains that I then had to evaluate by hand. This meant I had Majestic and Moz open to check the backlink anchor text and Archive.org to check for obvious spam for every single possible domain. The process was excruciatingly slow and tedious, but absolutely necessary to find domains that would be suitable for building out.
Since high quality expired domains are in low supply, the huge numbers of marketers competing for those drop domains tend to drive prices up. Also, if you use an exchange, you’re basically lucky to get whatever you can afford. In other words, niche specificity isn't guaranteed. This is going to be a problem because as Google continues to evolve, it is cracking down on domain niche relevance. In other words, its software is fast evolving to the point that it can tell what the niche of a particular domain is. If your private blog network is a patchwork of expired domains that involve many different and dissimilar niches, then you might be in trouble. You are at great risk of being penalized by Google.
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.
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What I like to do is sort by DP which stands for domain pop, and this is basically the number of linking root domains. So, BL is the number of back links. As you know that can be somewhat misleading if they have a lot of site wide links or multiple links from the same domain. I like to sort by domain pop. What that does is it brings up the sites with the most amount of referring domains.

Once a domain expires, the registrar will allow around 30 days for the original owner to renew it. This period depends on the registrar and can range from 2 weeks to a whole year. Once this period is over, the domain enters the "Pending Delete" status, during which it cannot be renewed, purchased or modified in any way. Once the Pending delete status is over, the domain is dropped back into the available pool, and can now be purchased by anyone.

Backorders don’t take place if a domain name expires at a registrar that has an auction partner, unless no bids are placed at that auction partner prior to the expiration date. Backorders (when domains are “caught”) only happen when a domain name goes through the full lifecycle and expires, is removed from the registry’s database, and becomes available for new registration.
There is a common misconception that domains expire on their expiration date. If a domain registration is not renewed by its expiration date, the domain simply goes into "expired" status, which means all services are shut off. Typically, we provide a 35-day grace period during which the current holder can still renew it for the standard renewal fee. For more information please review our domain deletion policy.
Regarding my statement above, “Any domain name that reaches expired status and is not renewed by the owner will be auctioned by an auction service.”–it did overstretch. I’ve modified it to be: “A domain name that reaches expired status and is not renewed by the owner will be listed at an auction service (see FAQ for exception to this rule).” Then I added a FAQ to clarify. Please check my thinking:
One of the ways to make the most of this strategy is to sign up for Mobidea. Whatever expired domain you may have, there are high odds that Mobidea would have an offer that’s relevant to your domain’s niche. You simply host your website on the expired domain, place Mobidea’s offers on your website and whenever you make a sale through your website, you receive an affiliate commission!
So, what I like to do is also choose DMAS listed entry. No fake or no unsure page rank. Click the apply filter button and this will show us a much better group of websites, including a lot of high page rank websites. That’s one great thing about Go Daddy Auctions that you don’t have to guess about what the rank will be which is not the case with a lot of deleted domains which, because they were deindexed they didn’t have any content, they didn’t have any hosting, they don’t have any page rank. So, you have to make an estimation.

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.
That’s it for deleted domains which you can just pick up by heading over to your favorite registrar and registering it right away as long as it says, free and green here. If it says registered it’s obviously taken. This is obviously a cheap way to get some great links because let’s say, you know, this site we saw is not bad. It doesn’t have page rank, but that could be just because there was no content on the site. If it has a solid link profile, you can be sure that the page rank will come back and you can pick it up for about $10.
What DomCop does for you, is show you a list of all these domains along with important metrics for every domain. These metrics, along with our powerful filtering and sorting capabilities, will help reduce the size of the daily list from 200,000+ to just a handful of the very best domains. What would take you hours, will now literally take you seconds to do.