0.0.0.0 is a valid address syntax. So it should parse as valid wherever an IP address in traditional dotted-decimal notation is expected.

0.0.0.0주소는 모든 ip를 의미한다
접근제어시 0.0.0.0으로 설정하여 모든 ip를 허용하거나 거부할 수 있다.

https://www.howtogeek.com/225487/what-is-the-difference-between-127.0.0.1-and-0.0.0.0/

#ComputerScience