Looks like Channel 4 has a little duplication problem at the moment on their IP address http://83.98.28.10/. It’s resulting in double listing with the domain and the IP ranking for some queries which we know Google doesn’t like.

channel-4-duplication

In total around 8,000 pages of 6,390,000 pages of Channel 4’s site have this problem which I’m sure isn’t having a massive negative effect in the grand scheme of things.

channel-4-duplication-site-command

All that’s needed is a 301 re-direct from the IP address to the domain. On apache servers this can be done with something along the lines of

RewriteEngine on
RewriteCond %{HTTP_HOST} =999.999.999.999
RewriteRule ^(.*) http://www.domain.com/$1 [R=301,L]