It appears that you want to create a subdomain to a root IP address, and then forward a subdomain from a different domain to this subdomain.
First you would create an
A record for the
api.company.com subdomain as demonstrated here under "Example 1" (ignoring the FTP part; also note that
www is considered a subdomain as well, just like
So in the DNS tables for
company.com you'd create an
A record for:
api.company.com A 18.104.22.168
This establishes an alias record for host
api.company.com at IP address
Next you'd create a CNAME to this external host as demonstrated here under "Example 3". So in the DNS tables for
website.com you'd create a CNAME record for:
api CNAME api.company.com.
Then you'd need to wait 24-48 hours for these DNS changes to propagate to DNS servers throughout the Internet in order for these subdomains to resolve properly, so don't make any other changes during that time.