title: IP address from nslookup sometimes doesn't work, e.g. with wikipedia
body: <p>As I understand it, nslookup [domain_name] will give you the IP address of a domain name. When I run <code>nslookup wikipedia.org</code>, I get</p>
  
  <pre><code>    Server:     138.23.146.213
      Address:    138.23.146.213#53
  
      Non-authoritative answer:
      Name:   wikipedia.org
      Address: 198.35.26.96
  </code></pre>
  
  <p>So if I enter 198.35.26.96 in my web browser, I should reach wikipedia.org. This works for some websites, like google.com and facebook.com, and mozilla.org. But it gets an error for other websites, like wikipedia.org, craiglist.org, and wordpress.org.</p>
  
  <p>Does anybody know why?</p>