Hi @whijoon
On your computer, you have to configure the DNS server manually or you receive it through the DHCP server:
You could configure the DNS server of your ISP or anything else (8.8.8.8 is Google DNS).
It’s also possible that you see the IP address of your local router here. Most SOHO routers will act as a “proxy” / simple DNS server for your computers. When it receives a DNS request, it will forward it to the ISP DNS servers to figure out the IP address that belongs to the hostname. This is then returned to the computer.