When I am trying to fetch broken links of a webpage not getting all of them in webdriver java

Question

All links are not fetching among total 210 links.and only 2 links are getting fetched in output

List <WebElement> links=driver.findElements(By.tagName("a"));
System.out.println("Total no of liks are: "+ links.size());
for (int i=0;i<links.size();i++)
{
WebElement element=links.get(i);
System.out.println(element);
String url=element.getAttribute("href");
URL myurl=new URL(url);
System.out.println(myurl);
HttpURLConnection httpconn= (HttpURLConnection) myurl.openConnection();
Thread.sleep(3000);
httpconn.connect();
int rescode=httpconn.getResponseCode();
if(rescode>=400)
{
System.out.println(rescode + "This is broken link");
}
else
{
System.out.println(rescode + "This is not a broken link");  
}
}