Domain Blocked Check
Compare DNS resolution between mainland China and overseas resolvers plus an access test to judge whether a domain may be blocked.
courses.org
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。
152.89.79.68
Mainland IPs
152.89.79.68
Overseas IPs
Resolver results
| DNS | Region | Status | IP | Time (ms) |
|---|---|---|---|---|
| 阿里DNS 223.5.5.5 | Mainland China | OK | 152.89.79.68 | 63 |
| 腾讯DNS 119.29.29.29 | Mainland China | OK | 152.89.79.68 | 243 |
| 114DNS 114.114.114.114 | Mainland China | OK | 152.89.79.68 | 518 |
| 百度DNS 180.76.76.76 | Mainland China | OK | 152.89.79.68 | 510 |
| Google DNS 8.8.8.8 | Overseas | OK | 152.89.79.68 | 200 |
| Cloudflare 1.1.1.1 | Overseas | OK | 152.89.79.68 | 292 |
| Quad9 9.9.9.9 | Overseas | OK | 152.89.79.68 | 167 |
| OpenDNS 208.67.222.222 | Overseas | OK | 152.89.79.68 | 651 |
Access test
| URL | Status | Time (ms) |
|---|---|---|
| https://courses.org | HTTP 200 | 3651 |
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。