You might want to assign dedicated IP to your subdomain for some reason such as apply SSL to your subdomain.
If you are using cPanel and wish to set dedicated IP to your subdomain, you will find no else where to do that.
However, this could still be able to fix as this article.
– You have domain domain.com and subdomain blog.domain.com.
– You wish to set dedicated IP for blog.domain.com which originally 100.100.100.100 and result as blog.domain.com resolve to 10.0.0.1.
Continue reading cPanel: Assigned dedicated IP to subdomain
If you have cPanel server and wish to add SPF record in one shot, there is a command come with cPanel to allow you to done it without modify each of the DNS record.
The command line will be as below where cPanel_username should represent your cPanel’s username.
It will result the DNS zone added the following line,
"v=spf1 a mx ip4:184.108.40.206 ?all"