course.cn - robtex.com
course.cn
| DNSSEC | ⚠️ Not signed | ||||||
| A | 8.218.126.38🇭🇰 Alibaba-Cloud8.218.0.0/17 Alibaba.com Singapore E-Commerce Private Limited 8 Shenton Way, 45-01 AXA Tower, Singapore 068811 | ||||||
| NS | dns8.66.cn ⚠️ Not in zone NS records | ||||||
| NS | dns9.66.cn ⚠️ Not in zone NS records | ||||||
| A | 123.56.111.68🇨🇳 Alibaba-Cloud123.56.0.0/16 Alibaba (US) Technology Co., Ltd. | ||||||
cn
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a.dns.cn ⭐ | ||||||
| NS | b.dns.cn | ||||||
| NS | c.dns.cn | ||||||
| NS | d.dns.cn | ||||||
| NS | e.dns.cn | ||||||
| NS | ns.cernet.net ⚠️ Not in parent delegation | ||||||
| SOA | a.dns.cnroot@cnnic.cn serial=2035004497 | ||||||
Same first word
Similar names
DNS History
6 records (3 active, 3 former)
○A103.232.215.1382016-09-11 → 2016-09-11 · 4 obs
○ 2016-04-06 03:32:06
● 2016-09-11 11:06:44
○ 2021-01-19 23:52:16
○ 2026-07-05 06:24:38
● 2016-09-11 11:06:44
○ 2021-01-19 23:52:16
○ 2026-07-05 06:24:38
○A184.105.178.912015-07-19 → 2016-04-06 · 4 obs
● 2015-07-19 20:38:52
● 2016-04-06 03:32:06
○ 2016-09-11 11:06:44
○ 2026-07-05 06:24:38
● 2016-04-06 03:32:06
○ 2016-09-11 11:06:44
○ 2026-07-05 06:24:38
○A47.75.42.252021-01-19 → 2021-01-19 · 4 obs
○ 2016-09-11 11:06:44
● 2021-01-19 23:52:16
○ 2026-06-27 13:58:34
○ 2026-07-05 06:24:38
● 2021-01-19 23:52:16
○ 2026-06-27 13:58:34
○ 2026-07-05 06:24:38
●A8.218.126.382026-06-27 → 2026-07-05 · 3 obs
○ 2021-01-19 23:52:16
● 2026-06-27 13:58:34
● 2026-07-05 06:24:38
● 2026-06-27 13:58:34
● 2026-07-05 06:24:38
🔍 DNS Trace
Analysis
IP Addresses
course.cn has exactly one IP address — 8.218.126.38.
chotto.cn, interpark.cn, changpai.cn plus two other host names have IP numbers in common with course.cn.
Name Servers
course.cn has two authoritative name servers — dns8.66.cn and dns9.66.cn.
The name server configuration of course.cn is shared with other domains, for instance laichuan.cn, chuangjiu.cn, 6979.cn and two others.
Host names resolving to a single IP address:
dns9.66.cn resolves to 123.56.111.68.