IPv6 Excuse Bingo

IPv6 is a security risk We can use RFC6598 We would have to rewrite our entire application to support it My transit provider doesn't support IPv6 We'll deploy IPv6 next financial year
Azure doesn't support it Vendor bugs We don't have a lab to test it There's no certification track Android doesn't support DHCPv6
It's not supported by Google Compute Larger headers are less efficient We don't need that many addresses What do you mean I have to wrap an IP in square brackets?
It's not mature enough IPv6 is slower than IPv4 None of our customers want it IPv6 isn't supported by OVH Cloud Our recursive DNS can't handle the extra load
Github doesn't support IPv6 What's IPv6? We've still got plenty of IPv4 We have IPv6, but we just want to keep things simple We'll deploy IPv6 right after we deploy DNSSEC
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