Originally Posted by
techie
All is kosher with my network, so it is likely to be the latter. Though it should be relatively easy for BA to change appropriate DNS records to point existing host names to new IPs for uninterrupted service.
It suggests the name is no longer registered (to any IP) rather than the IP is wrong. Probably it was a subdomain.
Whether the name is under BA's control is not so clear, could be pulled from an external provider.