联通亲测ok

52.74.223.119 github.com
140.82.113.3 gist.github.com
185.199.111.153 assets-cdn.github.com
199.232.96.133 raw.githubusercontent.com
199.232.96.133 gist.githubusercontent.com
199.232.96.133 cloud.githubusercontent.com
199.232.96.133 camo.githubusercontent.com
199.232.96.133 avatars.githubusercontent.com
199.232.96.133 avatars0.githubusercontent.com
199.232.96.133 avatars1.githubusercontent.com
199.232.96.133 avatars2.githubusercontent.com
199.232.96.133 avatars3.githubusercontent.com
199.232.96.133 avatars4.githubusercontent.com
199.232.96.133 avatars5.githubusercontent.com
199.232.96.133 avatars6.githubusercontent.com
199.232.96.133 avatars7.githubusercontent.com
199.232.96.133 avatars8.githubusercontent.com

GFW对GitHub实行了更高级别的阻断手段，不论是指定哪个IP 客户端与该IP的链接都会在几分钟后被强行阻断三分钟 表现是超时和重置 随后正常 具体过程可看本贴：https://hostloc.com/forum.php?mod=viewthread&tid=818119&page=4#pid10079042