Server with 2 IPs - PCs resolve to different IPs???

I just inherited a network with 4 servers that all have 2 IPs configured on
them. In my experience this is no good. While trying to remove the unneeded
IP from the servers, I have come across several PCs that still try to resolve
the IP address that I removed, even after manually removing all DNS records
pointing to it, flushing the DNS cached, etc. Any ideas why this would be
happening?

Appreciated.

 

In

Are these IPs on the same subnet?

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There are (on modern machines) caches on both the
server and the client side:

DNS server cache
DNS client cache

Use IpConfig /flushDNS or Stop/Start the "DNS Client"
service to flush the client side cache.