I have a domain name (somename.com) registered at godaddy and i am using godaddy DNS Manager. But i am hosting my website with hostinger.com. So i have created a subdomain (sub.somename.com) on hostinger which by default points to same IP as a domain.
Now i have entry on godaddy DNS for my domain and subdomain name which points to hostinger server address where my website hosted. But when i access my subdomain (sub.somename.com) it goes to my somename.com. I have to refresh it to load sub domain page correctly.
Godaddy DNS Entry
domainname -- somename.com -> IP address of hostinger.com
subdomain -- sub.somename.com --> IP address of hostinger.com (same as above)
Hostinger DNS Entry
subdomain -- sub.somename.com --> IP address of hostinger.com(same as above)
In order to create a subdomain correctly you have to go through 2 steps:
You should have these records for your setup:
There are different types of DNS Records, the one's you mentioned are all A Records, you have to use CNAME Records as well.
The previous step was so that the Domain Name Servers know to which ip to point when the subdomain is used. From this side we have to point the subdomain address (sub.somename.com) to a specific folder that contains the different website. Most host providers, when you create a subdomain automatically create a new folder you can put your content at and point at it.
P.S. Since I haven't used hostinger before, feel free to update me if you have more info, like if you're using CPanel.