Thank you very much for Asking questions  and  your interest to know about us. I’m very glade to know that.
your first question  is –
Q1: Can I check PA & DA from linkworld?
Ans: Yes, you can check PA & DA from linkworld.

Q 2: How to check Domain Authority and Page Authority for linkworld.us ?
Ans: You can check your sites Domain Authority, Page Authority, Moz Rank, Links Equity and IP Address from link.
I’m trying to tell you how?

Go to linkworld.us or https://www.linkworld.us/act/

Click on, site test from the menu.
and type the URL, which you want to check.

Now click on check authority.
Here you will get your websites. Domain Authority, Page Authority, Moz Rank, Links Equity and IP Address.

Thanks for being with Link World.

Please watch this video for more clarification :

Thanks.