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The images below shows the deployment of IPv6 via China Mobile 4G at Heilongjiang province, can be regarded as the appendage which supports the analytic blog article of @Cloudflare. With the direct peering between CloudFlare & CMI at HKIX, the latency is conceivably acceptable.
@Miyamizu_Mitsuha Fantastic. People don't often think IPv6 process begins earlier in such a faraway province (Heilongjiang) or ISP (CM). That really surprised me.