What does [::1] mean in ALLOWED_HOSTS in Django?

Question

I was going through the documentation for Django's ALLOWED_HOSTS here

I came across a string ['localhost', '127.0.0.1', '[::1]'] in the ALLOWED_HOSTS.

Everything looks fine except the '[::1]' part.

I can't find a realtime scenario where '[::1]' is used.

Can someone please explain in which use case we will use this [::1]

Answer 1

[::1] is the loopback address in ipv6, the equivalent would be 127.0.0.1 in ipv4.

Answer 2

I know ::1 is normally used for IPv6 as localhost