Long time lurker, first time poster.
I'm stuck in a bind and can't seem to find a solution. The scenerio:
Client has set up subdomain.example.com which lists an A record at the domain registrar to point the hosting for the subdomain to server B (using IP)
the subdomain now needs to be moved to server C for better resources, but we can't change the IP address at the domain registrar (in-house IT team won't give access or make the change!)
I thought maybe I could setup an A record at server B that points to server C, but that didn't seem to work.
Is there a way to have server B send traffic to server C, using the same URL? (subdomain.example.com)
No.
DNS is hierarchical. If whoever controls the domain (or an ancestor) refuses to help you, you're out of luck. Get a new domain, or a new in-house IT team.