Domain Blocked Check
Compare DNS resolution between mainland China and overseas resolvers plus an access test to judge whether a domain may be blocked.
duo.com
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。
52.85.128.109, 52.85.128.84, 52.85.128.129, 52.85.128.71, 3.161.82.78, 3.161.82.84, 3.161.82.4, 143.204.194.122, 143.204.194.53, 143.204.194.126, 143.204.194.103
Mainland IPs
52.85.128.71, 52.85.128.84, 52.85.128.129, 52.85.128.109
Overseas IPs
Resolver results
| DNS | Region | Status | IP | Time (ms) |
|---|---|---|---|---|
| 阿里DNS 223.5.5.5 | Mainland China | OK | 52.85.128.109, 52.85.128.84, 52.85.128.129, 52.85.128.71 | 140 |
| 腾讯DNS 119.29.29.29 | Mainland China | OK | 52.85.128.71, 52.85.128.84, 52.85.128.109, 52.85.128.129 | 76 |
| 114DNS 114.114.114.114 | Mainland China | OK | 3.161.82.78, 3.161.82.84, 3.161.82.4 | 97 |
| 百度DNS 180.76.76.76 | Mainland China | OK | 143.204.194.122, 143.204.194.53, 143.204.194.126, 143.204.194.103 | 274 |
| Google DNS 8.8.8.8 | Overseas | OK | 52.85.128.71, 52.85.128.84, 52.85.128.129, 52.85.128.109 | 83 |
| Cloudflare 1.1.1.1 | Overseas | OK | 52.85.128.129, 52.85.128.71, 52.85.128.109, 52.85.128.84 | 7 |
| Quad9 9.9.9.9 | Overseas | OK | 52.85.128.84, 52.85.128.129, 52.85.128.109, 52.85.128.71 | 69 |
| OpenDNS 208.67.222.222 | Overseas | OK | 52.85.128.109, 52.85.128.129, 52.85.128.71, 52.85.128.84 | 357 |
Access test
| URL | Status | Time (ms) |
|---|---|---|
| https://duo.com | HTTP 200 | 1283 |
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。