Domain Blocked Check
Compare DNS resolution between mainland China and overseas resolvers plus an access test to judge whether a domain may be blocked.
doc.io
Confidence: 高
Not blocked
各节点 DNS 解析一致且可正常解析，未发现被墙特征。 但本站出口无法访问该站点，可能存在服务器访问限制或地域策略。
20.70.246.20, 20.76.201.171, 20.112.250.133, 20.236.44.162, 20.231.239.246
Mainland IPs
20.231.239.246, 20.112.250.133, 20.76.201.171, 20.236.44.162, 20.70.246.20
Overseas IPs
Resolver results
| DNS | Region | Status | IP | Time (ms) |
|---|---|---|---|---|
| 阿里DNS 223.5.5.5 | Mainland China | OK | 20.70.246.20, 20.76.201.171, 20.112.250.133, 20.236.44.162, 20.231.239.246 | 37 |
| 腾讯DNS 119.29.29.29 | Mainland China | OK | 20.231.239.246, 20.70.246.20, 20.76.201.171, 20.112.250.133, 20.236.44.162 | 115 |
| 114DNS 114.114.114.114 | Mainland China | OK | 20.231.239.246, 20.76.201.171, 20.112.250.133, 20.70.246.20, 20.236.44.162 | 269 |
| 百度DNS 180.76.76.76 | Mainland China | OK | 20.231.239.246, 20.76.201.171, 20.70.246.20, 20.236.44.162, 20.112.250.133 | 412 |
| Google DNS 8.8.8.8 | Overseas | OK | 20.231.239.246, 20.112.250.133, 20.76.201.171, 20.236.44.162, 20.70.246.20 | 41 |
| Cloudflare 1.1.1.1 | Overseas | OK | 20.76.201.171, 20.112.250.133, 20.236.44.162, 20.231.239.246, 20.70.246.20 | 124 |
| Quad9 9.9.9.9 | Overseas | OK | 20.76.201.171, 20.112.250.133, 20.236.44.162, 20.231.239.246, 20.70.246.20 | 195 |
| OpenDNS 208.67.222.222 | Overseas | OK | 20.76.201.171, 20.112.250.133, 20.231.239.246, 20.236.44.162, 20.70.246.20 | 104 |
Access test
| URL | Status | Time (ms) |
|---|---|---|
| https://doc.io | ERR_TLS_CERT_ALTNAME_INVALID | 958 |
| http://doc.io | HTTP 200 | 4490 |
说明：通过对比中国内地与海外多节点 DNS 解析结果并结合访问测试判断，结果为参考性结论，不能替代专业网络诊断。