Old domain to new domain

[AL123al]

Hi,

A website on server A is no longer required. The owner has redirected some URLS of this website (via plugin) to his new website on server B  -but not all URLS. So when I use COMMAND site:website A , I see a mixture of redirected URLS and not redirected URLS.Therefore two websites are still being indexed in some form and causing duplication.

However, weirdly when I crawl with Screaming Frog I only see one URL which is 301 redirected to the new website.  I would have thought I'd see lots of URLs which hadn't been redirected. How come it is different to using the site:command?

Anyway, how do I move to the new website completely without the old one being indexed anymore. I thought I knew this but have read so many blogs I've confused myself!

Should I:

1. Redirect all URLS via the HTACESS file on old website on server A? There are lots of pages indexed so a lot of URLs. What if I miss some?

or

2. Point the old domain via DNS to server B and do the redirects in website B HTaccess file? This seems more sensible but does this method still retain the website rankings?

Thanks for any help

[AL123al]

Yes, that's great. Thank you

[ThompsonPaul]

Definitely use option #2. There's no reason to have to maintain a server presence for the old site if it's been replaced. This is best practice - still fully allows ranking authority transfer to new domain.

Yes, it's a lot of work to do the redirects. Watch for cases where large numbers of URLs are the same, with just the domain name changed. Or that all have similar change required (e.g. removing a /category directory) Those can be handled with a single regex rule instead of having to create an individual redirect for each.

To ensure you catch as many of the old URLs as possible you can use the Screaming Frog crawl as the list of URLs needing redirects. Can help to merge that with with the old site's XML sitemap for completeness. Note - you'll have to redo the redirects from the plugin as well, as those will no longer work after the DNS is pointed to the new domain.  Check the old site's htaccess for an legacy redirects as well. It's usually also beneficial to redirect the images and other important media (pdfs and other downloadable files) if you can.

Then set up a process to monitor Google Search Console and Google Analytics on the new site to immediately detect and correct any new 404 errors that show up. (That's another major advantage of doing the redirect on the new site's htaccess - the 404s will actually be detectable with tools.)

Lastly, ensure you've used the Change of Address tool in Google Search Console to notify Google that the old site has moved to the new domain. Keeping the old site verified in GSC will allow for this, and will let you monitor the drop-off in indexing of the old site as Google recognises and indexes the transition.

Hope that all makes sense?

Paul