GitHub是一个面向开源及私有软件项目的托管平台，因为只支持Git作为唯一的版本库格式进行托管，故名GitHub。GitHub拥有1亿以上的开发人员，400万以上组织机构和3.3亿以上资料库。
GitHub可以托管各种git库，并提供一个web界面，但它与外国的SourceForge、Google Code或中国的coding的服务不同，GitHub的独特卖点在于从另外一个项目进行分支的简易性。为一个项目贡献代码非常简单：首先点击项目站点的“fork”的按钮，然后将代码检出并将修改加入到刚才分出的代码库中，最后通过内建的“pull request”机制向项目负责人申请代码合并。已经有人将GitHub称为代码玩家的MySpace。
在GitHub进行分支就像在Myspace（或Facebook）进行交友一样，在社会关系图的节点中不断的连线。
GitHub项目本身自然而然的也在GitHub上进行托管，只不过在一个私有的，公共视图不可见的库中。开源项目可以免费托管，但私有库则并不如此。Chris Wanstrath，GitHub的开发者之一，肯定了通过付费的私有库来在财务上支持免费库的托管这一计划。
无法访问GitHub可能有多种原因，其中常见的包括网络问题、地域性限制、GitHub平台维护、本地DNS缓存污染或您的账户或IP被限制。建议首先检查您的网络连接和GitHub的官方通知，了解是否有相关的服务中断或维护信息。
解决办法：
修改hosts文件
hosts是一个系统文件，将一些常用的网址域名与其对应的 IP 地址建立对应的key-value数据库。当浏览器中访问网址时，系统首先从hosts文件中寻找对应的 IP 地址，找到对应关系，则立即打开对应网页，如果没有找到，则系统会将网址提交 DNS 域名解析服务器进行 IP 地址的解析。
- 访达-->前往-->前往文件夹
- 输入 /etc , 回车
- 找到hosts文件
- 打开hosts文件，发现文件已被锁定
- 在终端打开文件
sudo vim /etc/hosts
- 输入e，回车；输入i，往文件中添加以下内容：
# GitHub IP hosts Start
# Auto update time: 2024-07-08 10:28:03 UTC+08:00
# IP 可能会随时变化，请关注 GitHub 项目，以获取最新数据
# GitHub url: https://github.com/ittuann/GitHub-IP-hosts
# Update url: https://raw.githubusercontent.com/ittuann/GitHub-IP-hosts/main/hosts
140.82.112.26 alive.github.com
140.82.114.25 alive.github.com
140.82.113.6 api.github.com
140.82.114.5 api.github.com
185.199.108.153 assets-cdn.github.com
185.199.109.153 assets-cdn.github.com
185.199.110.153 assets-cdn.github.com
185.199.111.153 assets-cdn.github.com
185.199.108.133 avatars.githubusercontent.com
185.199.109.133 avatars.githubusercontent.com
185.199.110.133 avatars.githubusercontent.com
185.199.111.133 avatars.githubusercontent.com
185.199.108.133 avatars0.githubusercontent.com
185.199.109.133 avatars0.githubusercontent.com
185.199.110.133 avatars0.githubusercontent.com
185.199.111.133 avatars0.githubusercontent.com
185.199.108.133 avatars1.githubusercontent.com
185.199.109.133 avatars1.githubusercontent.com
185.199.110.133 avatars1.githubusercontent.com
185.199.111.133 avatars1.githubusercontent.com
185.199.108.133 avatars2.githubusercontent.com
185.199.109.133 avatars2.githubusercontent.com
185.199.110.133 avatars2.githubusercontent.com
185.199.111.133 avatars2.githubusercontent.com
185.199.108.133 avatars3.githubusercontent.com
185.199.109.133 avatars3.githubusercontent.com
185.199.110.133 avatars3.githubusercontent.com
185.199.111.133 avatars3.githubusercontent.com
185.199.108.133 avatars4.githubusercontent.com
185.199.109.133 avatars4.githubusercontent.com
185.199.110.133 avatars4.githubusercontent.com
185.199.111.133 avatars4.githubusercontent.com
185.199.108.133 avatars5.githubusercontent.com
185.199.109.133 avatars5.githubusercontent.com
185.199.110.133 avatars5.githubusercontent.com
185.199.111.133 avatars5.githubusercontent.com
185.199.108.133 camo.githubusercontent.com
185.199.109.133 camo.githubusercontent.com
185.199.110.133 camo.githubusercontent.com
185.199.111.133 camo.githubusercontent.com
140.82.113.21 central.github.com
140.82.114.22 central.github.com
185.199.108.133 cloud.githubusercontent.com
185.199.109.133 cloud.githubusercontent.com
185.199.110.133 cloud.githubusercontent.com
185.199.111.133 cloud.githubusercontent.com
140.82.113.9 codeload.github.com
140.82.114.10 codeload.github.com
140.82.112.22 collector.github.com
140.82.113.21 collector.github.com
185.199.108.133 desktop.githubusercontent.com
185.199.109.133 desktop.githubusercontent.com
185.199.110.133 desktop.githubusercontent.com
185.199.111.133 desktop.githubusercontent.com
140.82.113.22 education.github.com
140.82.114.22 education.github.com
185.199.108.133 favicons.githubusercontent.com
185.199.109.133 favicons.githubusercontent.com
185.199.110.133 favicons.githubusercontent.com
185.199.111.133 favicons.githubusercontent.com
140.82.113.3 gist.github.com
16.182.74.241 github-cloud.s3.amazonaws.com
3.5.0.126 github-cloud.s3.amazonaws.com
3.5.11.197 github-cloud.s3.amazonaws.com
3.5.25.234 github-cloud.s3.amazonaws.com
16.182.108.25 github-com.s3.amazonaws.com
16.182.98.241 github-com.s3.amazonaws.com
3.5.19.176 github-com.s3.amazonaws.com
3.5.21.166 github-com.s3.amazonaws.com
192.0.66.2 github.blog
140.82.113.4 github.com
140.82.112.18 github.community
140.82.113.18 github.community
185.199.108.154 github.githubassets.com
185.199.109.154 github.githubassets.com
185.199.110.154 github.githubassets.com
185.199.111.154 github.githubassets.com
151.101.1.194 github.global.ssl.fastly.net
151.101.129.194 github.global.ssl.fastly.net
151.101.193.194 github.global.ssl.fastly.net
151.101.65.194 github.global.ssl.fastly.net
185.199.108.153 github.io
185.199.109.153 github.io
185.199.110.153 github.io
185.199.111.153 github.io
185.199.108.133 github.map.fastly.net
185.199.109.133 github.map.fastly.net
185.199.110.133 github.map.fastly.net
185.199.111.133 github.map.fastly.net
185.199.108.153 githubstatus.com
185.199.109.153 githubstatus.com
185.199.110.153 githubstatus.com
185.199.111.153 githubstatus.com
140.82.114.25 live.github.com
140.82.114.26 live.github.com
185.199.108.133 media.githubusercontent.com
185.199.109.133 media.githubusercontent.com
185.199.110.133 media.githubusercontent.com
185.199.111.133 media.githubusercontent.com
185.199.108.133 objects.githubusercontent.com
185.199.109.133 objects.githubusercontent.com
185.199.110.133 objects.githubusercontent.com
185.199.111.133 objects.githubusercontent.com
13.107.42.16 pipelines.actions.githubusercontent.com
185.199.108.133 raw.githubusercontent.com
185.199.109.133 raw.githubusercontent.com
185.199.110.133 raw.githubusercontent.com
185.199.111.133 raw.githubusercontent.com
185.199.108.133 user-images.githubusercontent.com
185.199.109.133 user-images.githubusercontent.com
185.199.110.133 user-images.githubusercontent.com
185.199.111.133 user-images.githubusercontent.com
# GitHub IP hosts End
