Domain Blocked Check
Compare DNS resolution between mainland China and overseas resolvers plus an access test to judge whether a domain may be blocked.
istanbul.tips
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。
104.21.21.180, 172.67.199.174
Mainland IPs
172.67.199.174, 104.21.21.180
Overseas IPs
Resolver results
| DNS | Region | Status | IP | Time (ms) |
|---|---|---|---|---|
| 阿里DNS 223.5.5.5 | Mainland China | OK | 104.21.21.180, 172.67.199.174 | 45 |
| 腾讯DNS 119.29.29.29 | Mainland China | OK | 104.21.21.180, 172.67.199.174 | 116 |
| 114DNS 114.114.114.114 | Mainland China | OK | 104.21.21.180, 172.67.199.174 | 491 |
| 百度DNS 180.76.76.76 | Mainland China | OK | 172.67.199.174, 104.21.21.180 | 694 |
| Google DNS 8.8.8.8 | Overseas | OK | 172.67.199.174, 104.21.21.180 | 45 |
| Cloudflare 1.1.1.1 | Overseas | OK | 172.67.199.174, 104.21.21.180 | 72 |
| Quad9 9.9.9.9 | Overseas | OK | 104.21.21.180, 172.67.199.174 | 734 |
| OpenDNS 208.67.222.222 | Overseas | OK | 172.67.199.174, 104.21.21.180 | 408 |
Access test
| URL | Status | Time (ms) |
|---|---|---|
| https://istanbul.tips | HTTP 521 | 765 |
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。