Can't see all machines on the network?

I can't see all the machines on the network on a new DC we set up. I can map to them and ping them, just cant see them all in File Explorer/network. I have a network that we just took over, the previous admin used a for the DNS / server name that the company does't even own. So to get around the issues we set up static routes for the internal servers. This seems to work fine on the current production server that we will be migrating to a new production server. It can now see all the machines on the network and they show up in File Explorer/network. I have checked all the obvious things, sharing is enabled, all the proper services are running etc. The DNS records between the new and old server match.

So what we have is as follows.

Current server 2008r2: Had to add an a record to point the to the internal IP now it seems to be working, it can see all machines on the network when you open file explorer.

Old Exchange server 2008r2 that use to be the production server: Moved mail to hosted solution, now it only has data on it that we will be moving.

New server 2016: It will be the new production server to replace these older servers. We added it to the domain, made it a DC. I didn't want to go any further because I can only see a handful of machines on the network. Oddly enough the same machines on the old exchange server are the same machines I can see on the new server. I'm sure I am missing something simple here?

Just strange I can see all the machines on the Current server 2008 but not the other two. All of them have the same settings as far as I can tell.
Russell SailorsCIOAsked:
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Phillip MonkIT ManagerCommented:
I have recently taken over a network with a similar issue. I'd recommend that you remove the 2016 from the domain, create your new domain (from a domain that is actually owned by the company), then create a full trust relationship between the two so you can begin to migrate the machines and accounts from the current domain to the new domain. You should then be able to see all the active computers / servers. It's obvious that the previous admin had difficulty with the concept of AD / DNS so I wouldn't be too concerned about not seeing everything, there's a better than average chance that the Exchange server hasn't successfully  replicated in a while.

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Russell SailorsCIOAuthor Commented:
This may sound amateur but I have never set up a full trust relationship, I have seen instructions on this and it doesn't look to difficult. If we went this route would we still use the current AD structure with all the shares, users etc? Would they copy over or would it be starting from scratch? The company does not want to start over because they cant afford the down time. I did consider that though because this DNS is so screwed.
Russell SailorsCIOAuthor Commented:
Phillip MonkIT ManagerCommented:
The current AD would be intact through the migration and you would then move the machine and user accounts to the new domain. There are migration tools that will help you minimize downtime, but there should be no instance when the network is unusable.
Phillip MonkIT ManagerCommented:
Closed due to inactivity
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