Post by account_disabled on Jan 10, 2024 20:41:24 GMT -8
Country/language subdomains (en.domain.com, fr.domain.com, de.domain.com, jp.domain.com, etc.). There may be exceptions in our index, such as Wikipedia.org, but generally not so. Random subdomain names (support.domain.com, images.domain.com, etc.) Another decision providers of backlink tools must make is whether certain subdirectories should be treated as distinct domains. For example, I think most tools will classify different blogs on well-known platforms (e.g., user1.blogspot.com, user2.blogspot.com) as different domains because they are controlled by different users. But why not do the same for a site like medium.com/user1 or github.com/user1? At Ahrefs we don't do this currently, but we may in the future since different people may control different directories on the site. The point here is that there are many ways to count domain names. This is obvious when you look at different data from companies that calculate internet sites.
According to Verisign data , as of the third quarter of 2020, there Japan Phone Number List
were 370.7 million sites in registered domain names across all TLDs.According to Netcraft data, as of the third quarter of 2020, there were 1,229,948,224 sites across all unique domains, with 193.8 million active sites. According to Internet Live Stats , there are approximately 1.8 billion sites, with fewer than 200 million currently active. Obviously, every company has a different way of calculating domains.To sum up, what we do at Ahrefs is to calculate the domain names we know and eliminate spam domain names and inactive domain names. It will then be credited as a subdomain for a website such as blogspot.com. This brings our total number of domain names to 175 million.
Other tools may do this differently and produce different values. Why can't we see all links? We will only crawl links from sites that allow crawling. If a website owner blocks Ahrefs' crawler in their robots.txt file, we will not be able to crawl their site. For example, if you get a backlink from website.com, and website.com blocks Ahrefsbot (Ahrefs' crawler), we will not be able to crawl its website and the backlink will not show up in Ahrefs. IP blocking, user agent blocking from the server (unlike robots.txt), server timeouts, robot protection, and many other factors can also affect our ability to crawl certain websites. After all, crawling pages on a large scale is not easy.
According to Verisign data , as of the third quarter of 2020, there Japan Phone Number List
were 370.7 million sites in registered domain names across all TLDs.According to Netcraft data, as of the third quarter of 2020, there were 1,229,948,224 sites across all unique domains, with 193.8 million active sites. According to Internet Live Stats , there are approximately 1.8 billion sites, with fewer than 200 million currently active. Obviously, every company has a different way of calculating domains.To sum up, what we do at Ahrefs is to calculate the domain names we know and eliminate spam domain names and inactive domain names. It will then be credited as a subdomain for a website such as blogspot.com. This brings our total number of domain names to 175 million.
Other tools may do this differently and produce different values. Why can't we see all links? We will only crawl links from sites that allow crawling. If a website owner blocks Ahrefs' crawler in their robots.txt file, we will not be able to crawl their site. For example, if you get a backlink from website.com, and website.com blocks Ahrefsbot (Ahrefs' crawler), we will not be able to crawl its website and the backlink will not show up in Ahrefs. IP blocking, user agent blocking from the server (unlike robots.txt), server timeouts, robot protection, and many other factors can also affect our ability to crawl certain websites. After all, crawling pages on a large scale is not easy.