title: Why ww2 sub domains?
body: <p>I have seen on the web some domain names having prefix of ww2 or ww3 or so (<code>ww2.somedomain.example</code>, <code>ww3.yourdomain.example</code>). And these happen mostly when traveling from a page to page. What would be the reason of having such subdomains? Is there anything special about them or are they just another sub domain? I mean, are they useful in any particular context?</p>