2) prerelease auctions.  These are domains where the auction venue has contracted with the registrar, like Fabulous or Moniker, to auction off non-renewed domains.  Just before a domain enters the pending delete process, it goes to a private auction to any person who has backordered the name.  Some people feel that back links on these type of auctions still provide a SEO benifit. My testing indicates that there is zero SEO benifit when these domains are redirected into another site.  So if you get a domain with "pink squirels" in a lot of achor text to a domain and then point it at your domain, you don't rank for "pink squirels"
When the domain drops, the minute it drops, literally, they will try to get it and if you can get it, it’s yours. So, that’s it for expired domains. You can see it’s a little bit complicated and it takes some leg work, but if you’re interested in building a publisher network or a private blog network, this is a great way to find sites that have a great link profile without you having to actually build any links. So, that’s it for this video. I’ll see you in the next one.
The first is the link profile I and actually took this example carbondsystems.com because it looked like a pretty good choice. It’s from 2003. It has some links, some age and it’s in DMAS and looked at the link profile in DMAS. So, you just copy and paste the domain,  the home page it to here, click on the search links button and this will show you all the links to that site.
1. Some domain names don’t go to auction and are instead held by the registrar in their own portfolios (you called this “warehousing” by the registrar). This is probably less than 0.001% of the domain names….actually, probably even less. I suspect it would only be premium domain names with massive exact match local search quantities. Not surprisingly, I cannot find any information from registrars about their procedure, quantities of domains their keep, or ICANN’s rules (if any) about this.

Thousands of domain names expire every day. The reasons are different. Some owners forgot to renew the domains, some just don't want them anymore or they moved on to other projects. For most people these so called Expired Domains don't have any value. They just see a bunch of Domain Names someone else deleted and move on, but for the people who know about SEO or the value of good Backlinks, Expired Domain Names are money just waiting to get picked up from the street. The only problem is to separate the good ones from the bad ones. That is where ExpiredDomains.net comes into play.