If you buy a dropped domain from Snap or Namejet, the backlinks seem to be worthless for SEO.  They are valuable for traffic if it's targeted to your site.  Go ahead and 301 redirect into your site because it's the traffic from the back links that is worth something.  I use the Google URL builder to redirect these names so you can see the domain the traffic is coming from.
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.
Now the numbers of errors, for we give up crawling a web site in case you know, they've got some kind of anti scraping technology or the web sites just completely knackered or something thirty is generally fine. Limit number of pages crawled per website most the time you want that ticked. I have it about a hundred thousand less you are going to be crawling some particularly big websites. I like that there, because, if you have an endless, crawl and there's some kind of weird URL structure on a website like an old-school date picker or something you don't want to be endlessly stuck on that website. Show your URLs being crawled. Now, if you just want to see what it's doing, you can have it on for debugging sometimes, but I generally leave it off because it makes it slightly faster and writes results into a text file so as it goes along and it finds expired domains as well as showing you and the GUI here, you can write them into a text file just in case there's a crash or your PC shuts down or something like that.
By using GoDaddy auctions section, you can also use keywords to search the domain names that you are interested in. For instance, if you type the keyword something like “fitness”, it will list you out all the domain names that matches with the keyword “Fitness” so you can easily make a list of all the domain names with your desired keyword selection.
You can add it as part of a private blog network or you can 301 redirect an expired domain to your site to bring some trust and authority to your site. Now, in my experience, the best place to look for expired domains is this free website called expireddomains.net. So, you just have to head over there, make a free account and this is the page that you’ll see when you log in.

So, let's start off with the simple website list crawl. So settings for this is covered by the general crawl settings and these apply to all the other types of crawl as well, such as the Search crawl and the Endless cruel, so pretty simple really. Delay between each request to a website. One second, this is in seconds. Secondly, concurrent websites crawl how many websites you want to crawl at any one point in time and then how many threads will concurrently crawl per website. So that's ten, a crawl of ten websites at once, and each of those websites there's three different threads crawling. That's 30 concurrent connections you've got going.
Lets look at some settiings, so you could enter a list of websites to crawl for expired domains on, or you can enter a search query say you're looking to form a pbn to boost your money site, that's about horse riding or something you could put horse riding down there and then it'll search, Google for horse riding and then crawl all the domains that Google brings back to you. Then we've got endless crawl and you basically you put in a few seed websites and then it will just crawl endlessly from those websites. So it will take all the domains off those websites. First they'll check whether they're expired or not. If they're not expired, then it'll start crawling them and then it will crawl the ones it finds from them and so on so on and so on. It will just keep going ok.

Great post! I tried to repurpose an expired domain to build an authority site (your method 1) – but it doesn’t rank as it should. i checked the backlink profile via majestic and archive.org and it’s clean. also checked the metrics of the competition. with the amount of trust and link juice my expired domain has vs. the competition, it should be on page 1 for those keywords. is there something i’m missing here?
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.
Thank you for a very informative article. I am still a bit confused on a couple of things. There is a domain that I have been looking to purchase for about a year now and it expires within the next 24 hours. It is with name.com and appears for backorder at snapnames but not at namejet. I am assuming this is because they are both connected auction houses?
I am trying to find the auction house partnered with “Registration Technologies, Inc.” (http://registrationtek.com/). They appear ancient, but still active. I have attempted to contact them and received no response to my queries. How would I go about finding the auction house they are partnered with? Are you certain that all auctioning partnerships are exclusive?
Referring domains for anchor phrases usually reveals similar information. What you really want to look out for is whether or not the site has been picked up by a spammer in the past. A lot of times these expired domains were dropped, picked up by a website owner who then tried to rank it for keywords like Viagra, Cialis and whatever. You obviously don’t want that kind of domain.

The following TLDs are now fully supported with a deleted list and a droplist (pending delete list). .hn, .ht, .rw, .cr, .gl, .gy, .gs, .om, .qa, .ir, .pe, .com.pe, .tc, .ky, .th, .co.th, .ke, .co.ke, .uz, .kz, .pm, .re, .tf, .wf, .yt, .sx, .gd, .gi, .kg, .mu, .im, .ug, .sb, .tl, .st, .sm, .so, .sn, .pf, .nyc, .cloud, link, .ms, .mk, .af, .bi, .pr, .com.pr, .nf, .nc, .dm, .bo, .ki, .iq, .bj, .am, .as, .ax, .fo, .mg 
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