If you've landed on passport.weibo.cn expecting to log into Weibo, you're hitting a dead end. This subdomain is supposed to handle authentication for one of China's largest social networks, but it's currently showing a 404 error. That means the login page isn't working at all.
For a service that handles user credentials, this is a serious red flag. While the parent company (Weibo) is legitimate and well-known, the fact that this specific site is non-functional means you shouldn't try to enter any personal information here. It's possible this subdomain has been retired or is experiencing a prolonged outage.
Our analysis found a valid SSL certificate and no blacklist issues, which is typical for a major platform. But without a working page, contact support, or legal documents, there's no way to confirm this is safe to use. If you need to access Weibo, go directly to weibo.com or the official app. Passport.weibo.cn is not the place right now.