如何恢复macOS默认hosts内容

将下面的内容保存至/private/etc/hosts即可。

##
##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting. Do not change this entry
## 
127.0.0.1 localhost
255.255.255.255 broadcasthost
::1 localhost
fe80::1%lo0 localhost

如果你需要修改hosts文件可以参考：macOS修改hosts的3种方法