Erp hosting server ip convert to DNS

Hello Good Morning to All,

I have CentOS Server installed ERPnext Successfully up and running. i have one static ip and also forwaded port no. 80 from my router. i can able to access erp over internet from anywhere which is hosted in my office. in URL am using my static ip/login ex :;- . i cannot give my static ip to everyone. now i need to change into even i have achieved this too by editing host file.
now is there any way to access directly without editing host file or any entries in host file.

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