You mean "newer" and not "older" in this context.

Versions > 1.0.0 do not work with the flags option, at least when the flags are set to INET_PTON, on newer versions. I'll take your word on where the cut-off is but I tested 1.3.0 and saw the same behavior where it throws:

ValueError: Unrecognized IPAddress flags value: 1

Looks like a bug in python3-netaddr that it errors with "IPAddress" and not "IPNetwork". Not something in our control.

The only way netaddr will throw a ValueError is when flags is not a NOHOST. This is the situation for past 14 years, so any version comparison is not really solving a problem.

        if flags & ~NOHOST:
            raise ValueError('Unrecognized IPAddress flags value: %s' % (flags,))

I think we should simply always set flags=0 to the IPNetwork() call because we never have NOHOST in there anyway.

PR #7535 should fix the issue.

@mastersin since #7535 was merged, could you please retry master or ipa-4-12 (where #7536 was merged)? It should have a fix to this problem.
Once you have verified, we can close this PR.

@mastersin
I'm closing this PR as the issue should already be fixed in master and ipa-4-12 branches. Feel free to open a new ticket if that's not the case.