subdomains not added to DNS

[vantech]

When adding a subdomain via cPanel, we get this error response:
SubDomain Adder
Zone vantech.com does not exist, a new zone for george.vantech.com will be created.
You cannot add the zone george.vantech.com without passing an ip address! This probably means the dns lookup failed. The subdomain, george.vantech.com has been added.

The subdomain gets added to the httpd.conf, but not to our DNS server.

[aby]

When adding a subdomain via cPanel, we get this error response:
SubDomain Adder
Zone vantech.com does not exist, a new zone for george.vantech.com will be created.
You cannot add the zone george.vantech.com without passing an ip address! This probably means the dns lookup failed. The subdomain, george.vantech.com has been added.

The subdomain gets added to the httpd.conf, but not to our DNS server.

Are you trying to add the subdomain from the WHM as a separate account or the cpanel. If from the cpanel, you have to make sute that the db entry exists for the main domain. ie vantech.com.