What is www3 – WWW with a number added is an old domain naming technique use by some website. Website developer use www1, www2, www3, www4 in a URL to identify and name subdomains or hostnames that belong to different servers. You can use number after www like www1, www2….www6, www7 and so on to separate your domain or sub domain for load balancing of your website. Best WordPress Plugin For SEO
Are WWW1, WWW2, WWW3 so on Websites are Safe
Don’t panic as you know that WWW1 or WWW2. WWW3 are used for load balancing on domains with large user loads. If a number suddenly appeared after www. You can be redirected back to www in case a server is available again. So yes using number after www is totally safe.
Difference between www3 and www2, www1
Using number followed by a www like www3, www4, www5 and so on. It is totally different means these are having different web server. This is typically done by the developer just to identify the domain host.
Example: www2.seorankone1.com, www1.seorankone1.com
Such types of subdomains are often used for security purpose to secure webpages, which is why you will see it more often on internet banking than anywhere else. Hope you got your answer why do some websites have WWW2 Or WWW1, WWW7 in the URL. For More visit here