ONT Domain Number:-
192.168.1.1

BSNL Selfcare portal Registeration step by step process in Tamil check with this link:-

https://youtu.be/PR8VKiQfh08

Bsnl broadband plans change:-
https://youtu.be/8ipOoOtLRKE

Bsnl broadband bills download and check data usage :-
https://youtu.be/jZxUDIjzX_0