Port 53(DNS) open on the Internet for my public IP

[shashankb]

As I simply doing a random port scan , I found the DNS port 53 was open . Is it completely fine to be leaving it open like that

 

[JB701]

This?

BSNL intercepting in-bound DNS traffic over port 53? | BSNL Bharat Fiber Broadband

Last night I was just curious and did a simple default nmap scan of my BSNL public IPv4 address from another network and I was surprised to see that port 53 is open. I tried querying with dig and it did return a response. Quickly I reviewed my firewall rules and by default, everything is blocked...

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