Domain Blocked Check
Compare DNS resolution between mainland China and overseas resolvers plus an access test to judge whether a domain may be blocked.
security-systems.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。
109.71.54.121
Mainland IPs
109.71.54.121
Overseas IPs
Resolver results
| DNS | Region | Status | IP | Time (ms) |
|---|---|---|---|---|
| 阿里DNS 223.5.5.5 | Mainland China | OK | 109.71.54.121 | 1348 |
| 腾讯DNS 119.29.29.29 | Mainland China | OK | 109.71.54.121 | 753 |
| 114DNS 114.114.114.114 | Mainland China | OK | 109.71.54.121 | 496 |
| 百度DNS 180.76.76.76 | Mainland China | OK | 109.71.54.121 | 351 |
| Google DNS 8.8.8.8 | Overseas | OK | 109.71.54.121 | 501 |
| Cloudflare 1.1.1.1 | Overseas | OK | 109.71.54.121 | 745 |
| Quad9 9.9.9.9 | Overseas | OK | 109.71.54.121 | 519 |
| OpenDNS 208.67.222.222 | Overseas | OK | 109.71.54.121 | 1103 |
Access test
| URL | Status | Time (ms) |
|---|---|---|
| https://security-systems.com | HTTP 200 | 5746 |
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。