Domain Blocked Check
Compare DNS resolution between mainland China and overseas resolvers plus an access test to judge whether a domain may be blocked.
theorem.co
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。
3.170.221.53, 3.170.221.15, 3.170.221.82, 3.170.221.6, 65.8.76.51, 65.8.76.102, 65.8.76.98, 65.8.76.71, 65.8.131.79, 65.8.131.19, 65.8.131.28, 65.8.131.80
Mainland IPs
3.170.221.82, 3.170.221.53, 3.170.221.15, 3.170.221.6
Overseas IPs
Resolver results
| DNS | Region | Status | IP | Time (ms) |
|---|---|---|---|---|
| 阿里DNS 223.5.5.5 | Mainland China | OK | 3.170.221.53, 3.170.221.15, 3.170.221.82, 3.170.221.6 | 163 |
| 腾讯DNS 119.29.29.29 | Mainland China | OK | 3.170.221.6, 3.170.221.15, 3.170.221.82, 3.170.221.53 | 111 |
| 114DNS 114.114.114.114 | Mainland China | OK | 65.8.76.51, 65.8.76.102, 65.8.76.98, 65.8.76.71 | 266 |
| 百度DNS 180.76.76.76 | Mainland China | OK | 65.8.131.79, 65.8.131.19, 65.8.131.28, 65.8.131.80 | 481 |
| Google DNS 8.8.8.8 | Overseas | OK | 3.170.221.82, 3.170.221.53, 3.170.221.15, 3.170.221.6 | 45 |
| Cloudflare 1.1.1.1 | Overseas | OK | 3.170.221.6, 3.170.221.15, 3.170.221.82, 3.170.221.53 | 104 |
| Quad9 9.9.9.9 | Overseas | OK | 3.170.221.15, 3.170.221.53, 3.170.221.82, 3.170.221.6 | 37 |
| OpenDNS 208.67.222.222 | Overseas | OK | 3.170.221.15, 3.170.221.53, 3.170.221.82, 3.170.221.6 | 307 |
Access test
| URL | Status | Time (ms) |
|---|---|---|
| https://theorem.co | HTTP 200 | 302 |
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。