at the bottom of my DNS records I get a load of additional records that do not appear in the standardvirtualftp template.

cpanel 14400 IN A 10.51.1.188
whm 14400 IN A 10.51.1.188
webmail 14400 IN A 10.51.1.188
webdisk 14400 IN A 10.51.1.188

where do they come from and how can I change the IP address they're using?
That's the server's internal IP address, but I want these A records to be the external IP address, otherwise you won't be able to use them from outside my network.