DNS IP integration does not report ipv6

[baahver]

The problem

DNS IP integration does report ipv4 address, but gives an error with ipv6. The ipv6 address is always unavailable.
Home assistant is running in a docker:

Core 2024.4.3
Frontend 20240404.2

external IPv6 is available on this box (debian 12).
When I open /config/integrations/integration/dnsip
and configure the integration I see: 208.67.222.222 and 2620:119:53::53 as resolvers, but I can not change these ip-addresses. If I do change this to 2620:119:35::35, I see an error: "invalid ip-address for resolver" (in dutch).
Configured in de UI

Last time it was working well for this ipv6 addres was 27 of februari. But not sure on what Home Assistant version that was.

What version of Home Assistant Core has the issue?

Core 2024.4.3

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant Core

Integration causing the issue

DNS IP

Link to integration documentation on our website

https://www.home-assistant.io/integrations/dnsip

Diagnostics information

No response

Example YAML snippet

No response

Anything in the logs that might be useful for us?

Nothing in the log

Additional information

No response

[home-assistant]

Hey there @gjohansson-ST, mind taking a look at this issue as it has been labeled with an integration (dnsip) you are listed as a code owner for? Thanks!

Code owner commands

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[gjohansson-ST]

HA needs to be able to resolve ipv6, it's not enough with your box to be able to do so.

Check if HA itself has ipv6 availability from the network settings page.