Domain Blocked Check
Compare DNS resolution between mainland China and overseas resolvers plus an access test to judge whether a domain may be blocked.
portland.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。 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。
181.214.142.230
Mainland IPs
181.214.142.230
Overseas IPs
Resolver results
| DNS | Region | Status | IP | Time (ms) |
|---|---|---|---|---|
| 阿里DNS 223.5.5.5 | Mainland China | OK | 181.214.142.230 | 2327 |
| 腾讯DNS 119.29.29.29 | Mainland China | OK | 181.214.142.230 | 74 |
| 114DNS 114.114.114.114 | Mainland China | OK | 181.214.142.230 | 2608 |
| 百度DNS 180.76.76.76 | Mainland China | OK | 181.214.142.230 | 3848 |
| Google DNS 8.8.8.8 | Overseas | OK | 181.214.142.230 | 33 |
| Cloudflare 1.1.1.1 | Overseas | OK | 181.214.142.230 | 3233 |
| Quad9 9.9.9.9 | Overseas | OK | 181.214.142.230 | 2 |
| OpenDNS 208.67.222.222 | Overseas | OK | 181.214.142.230 | 454 |
Access test
| URL | Status | Time (ms) |
|---|---|---|
| https://portland.org | CERT_HAS_EXPIRED | 773 |
| http://portland.org | CERT_HAS_EXPIRED | 1469 |
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。