How do I know if a computers is inside of the domain?

i have received file thousand names of computers.

how can validate if computers inside of domain?

 

go here have run script

http://www.lazynetworkadmin.com/knowledgebase-mainmenu-6/2-windows/38-list-all-computers-in-your-domain

 

or here

http://www.codeproject.com/articles/67493/list-all-computers-in-a-domain-the-quick-way.aspx

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http://www.virmansec.com/blogs/skhairuddin

Windows Server  >  Directory Services