What is meaning of '[::1]'?

[bob gailer]

From
https://docs.djangoproject.com/en/1.10/ref/settings/#std:setting-ALLOWED_HOSTS:

"When DEBUG is |True| and |ALLOWED_HOSTS| is empty, the host is
validated against |['localhost', '127.0.0.1', '[::1]']|."

What is meaning of '[::1]'?

[James Bennett]

It's the IPv6 loopback address. So it has the same function as 127.0.0.1, just for IPv6 instead of IPv4.

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[Stephen J. Butler]

"::1" is the IPv6 loopback address. If you haven't seen IPv6 addresses before, they separate the parts of an address with ":" instead of ".". Using two together ("::") is a shorthand for "fill all these bits with zero" and it can appear only once in an address.

You see the brackets "[]" in URLs because otherwise any URL parser would get confused by what's the address and what's the port. For example, is "http://2607:f8b0:4009:812::200e:8080" telling you to connect to address "2607:f8b0:4009:812::200e" on port "8080", or address "2607:f8b0:4009:812::200e:8080" on the standard port 80? Brackets make this unambiguous: "http://[2607:f8b0:4009:812::200e]:8080/"

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