Domain Blocked Check
Compare DNS resolution between mainland China and overseas resolvers plus an access test to judge whether a domain may be blocked.
itheory.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。 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。
198.49.23.181, 198.49.23.180, 198.185.159.181, 198.185.159.180
Mainland IPs
198.49.23.181, 198.185.159.180, 198.185.159.181, 198.49.23.180
Overseas IPs
Resolver results
| DNS | Region | Status | IP | Time (ms) |
|---|---|---|---|---|
| 阿里DNS 223.5.5.5 | Mainland China | OK | 198.49.23.181, 198.49.23.180, 198.185.159.181, 198.185.159.180 | 121 |
| 腾讯DNS 119.29.29.29 | Mainland China | OK | 198.185.159.181, 198.49.23.180, 198.49.23.181, 198.185.159.180 | 229 |
| 114DNS 114.114.114.114 | Mainland China | OK | 198.49.23.180, 198.49.23.181, 198.185.159.181 | 688 |
| 百度DNS 180.76.76.76 | Mainland China | OK | 198.185.159.181, 198.185.159.180, 198.49.23.181, 198.49.23.180 | 352 |
| Google DNS 8.8.8.8 | Overseas | OK | 198.49.23.181, 198.185.159.180, 198.185.159.181, 198.49.23.180 | 63 |
| Cloudflare 1.1.1.1 | Overseas | OK | 198.185.159.180, 198.185.159.181, 198.49.23.180, 198.49.23.181 | 153 |
| Quad9 9.9.9.9 | Overseas | OK | 198.49.23.181, 198.49.23.180, 198.185.159.181, 198.185.159.180 | 183 |
| OpenDNS 208.67.222.222 | Overseas | OK | 198.185.159.181, 198.49.23.180, 198.49.23.181, 198.185.159.180 | 186 |
Access test
| URL | Status | Time (ms) |
|---|---|---|
| https://itheory.com | ERR_TLS_CERT_ALTNAME_INVALID | 383 |
| http://itheory.com | HTTP 404 | 457 |
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。