Domain Blocked Check
Compare DNS resolution between mainland China and overseas resolvers plus an access test to judge whether a domain may be blocked.
class3.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。
74.208.236.86
Mainland IPs
74.208.236.86
Overseas IPs
Resolver results
| DNS | Region | Status | IP | Time (ms) |
|---|---|---|---|---|
| 阿里DNS 223.5.5.5 | Mainland China | OK | 74.208.236.86 | 66 |
| 腾讯DNS 119.29.29.29 | Mainland China | OK | 74.208.236.86 | 281 |
| 114DNS 114.114.114.114 | Mainland China | OK | 74.208.236.86 | 579 |
| 百度DNS 180.76.76.76 | Mainland China | OK | 74.208.236.86 | 559 |
| Google DNS 8.8.8.8 | Overseas | OK | 74.208.236.86 | 181 |
| Cloudflare 1.1.1.1 | Overseas | OK | 74.208.236.86 | 438 |
| Quad9 9.9.9.9 | Overseas | OK | 74.208.236.86 | 155 |
| OpenDNS 208.67.222.222 | Overseas | OK | 74.208.236.86 | 1108 |
Access test
| URL | Status | Time (ms) |
|---|---|---|
| https://class3.com | ERR_SSL_TLSV1_ALERT_INTERNAL_ERROR | 769 |
| http://class3.com | HTTP 403 | 551 |
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。