course01.net - robtex.com
course01.net
| DNSSEC | ⚠️ Not signed | ||||||
| A | 39.108.186.86🇨🇳 Alibaba-Cloud39.108.128.0/17 | ||||||
| NS | vip3.alidns.com ⭐ | ||||||
| A | 2408:4009:500::3🇨🇳 AS451022408:4009:500::/48 Alibaba Group | ||||||
| A | 8.212.93.3🇭🇰 Alibaba_Cloud_SEC8.212.93.0/24 Alibaba.com Singapore E-Commerce Private Limited 8 Shenton Way, 45-01 AXA Tower, Singapore 068811 | ||||||
| A | 140.205.1.5🇨🇳 AS45102140.205.1.0/24 China Internet Network Information Center Floor1, Building No.1 C/-Chinese Academy of Sciences 4, South 4th Street Haidian District, | ||||||
| A | 170.33.32.210🇸🇬 Alibaba_Cloud_SEC170.33.32.0/24 Alibaba.com Singapore E-Commerce Private Limited 8 Shenton Way, 45-01 AXA Tower, Singapore 068811 | ||||||
| A | 170.33.40.136🇸🇬 Alibaba_Cloud_SEC170.33.40.0/24 Alibaba.com Singapore E-Commerce Private Limited 8 Shenton Way, 45-01 AXA Tower, Singapore 068811 | ||||||
| A | 170.33.73.26🇸🇬 Alibaba_Cloud_SEC170.33.73.0/24 Alibaba.com Singapore E-Commerce Private Limited 8 Shenton Way, 45-01 AXA Tower, Singapore 068811 | ||||||
| A | 170.33.80.10🇸🇬 Alibaba_Cloud_SEC170.33.80.0/24 Alibaba.com Singapore E-Commerce Private Limited 8 Shenton Way, 45-01 AXA Tower, Singapore 068811 | ||||||
| NS | vip4.alidns.com | ||||||
| A | 2408:4009:500::4🇨🇳 AS451022408:4009:500::/48 Alibaba Group | ||||||
| A | 8.212.93.4🇭🇰 Alibaba_Cloud_SEC8.212.93.0/24 Alibaba.com Singapore E-Commerce Private Limited 8 Shenton Way, 45-01 AXA Tower, Singapore 068811 | ||||||
| A | 140.205.1.6🇨🇳 AS45102140.205.1.0/24 China Internet Network Information Center Floor1, Building No.1 C/-Chinese Academy of Sciences 4, South 4th Street Haidian District, | ||||||
| A | 170.33.32.211🇸🇬 Alibaba_Cloud_SEC170.33.32.0/24 Alibaba.com Singapore E-Commerce Private Limited 8 Shenton Way, 45-01 AXA Tower, Singapore 068811 | ||||||
| A | 170.33.40.137🇸🇬 Alibaba_Cloud_SEC170.33.40.0/24 Alibaba.com Singapore E-Commerce Private Limited 8 Shenton Way, 45-01 AXA Tower, Singapore 068811 | ||||||
| A | 170.33.73.27🇸🇬 Alibaba_Cloud_SEC170.33.73.0/24 Alibaba.com Singapore E-Commerce Private Limited 8 Shenton Way, 45-01 AXA Tower, Singapore 068811 | ||||||
| A | 170.33.80.11🇸🇬 Alibaba_Cloud_SEC170.33.80.0/24 Alibaba.com Singapore E-Commerce Private Limited 8 Shenton Way, 45-01 AXA Tower, Singapore 068811 | ||||||
| MX | mx.ym.163.com ⭐ | ||||||
| A | 111.124.200.35 | ||||||
| SOA | vip3.alidns.comhostmaster@hichina.com 2025-12-10 #11 | ||||||
net
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a.gtld-servers.net ⭐ | ||||||
| NS | b.gtld-servers.net | ||||||
| NS | c.gtld-servers.net | ||||||
| NS | d.gtld-servers.net | ||||||
| NS | e.gtld-servers.net | ||||||
| NS | f.gtld-servers.net | ||||||
| NS | g.gtld-servers.net | ||||||
| NS | h.gtld-servers.net | ||||||
| NS | i.gtld-servers.net | ||||||
| NS | j.gtld-servers.net | ||||||
| NS | k.gtld-servers.net | ||||||
| NS | l.gtld-servers.net | ||||||
| NS | m.gtld-servers.net | ||||||
| SOA | a.gtld-servers.netnstld@verisign-grs.com serial=1778692691 | ||||||
Same first word
Similar names
DNS History
4 records (4 active, 0 former)
●NSvip3.alidns.com2026-04-27 → 2026-05-13 · 2 obs
● 2026-05-13 17:38:44
●NSvip4.alidns.com2026-04-27 → 2026-05-13 · 2 obs
● 2026-05-13 17:38:44
●MXmx.ym.163.com2026-04-27 → 2026-05-13 · 2 obs
● 2026-05-13 17:38:44
●A39.108.186.862026-04-27 → 2026-05-13 · 2 obs
● 2026-05-13 17:38:44
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| net | d.gtld-servers.net, i.gtld-servers.net, c.gtld-servers.net, g.gtld-servers.net... | - |
| course01.net | vip3.alidns.com, vip4.alidns.com | - |
✅ Authoritative Response
Server:170.33.80.10
NS records: vip3.alidns.com, vip4.alidns.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for course01.net (unsigned zone)
⏱️ Timing
Total: 2146ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 39.108.186.86 |
| NS | 2 | vip4.alidns.com, vip3.alidns.com |
| MX | 1 | mx.ym.163.com (pri: 10) |
| SOA | 1 | vip3.alidns.com hostmaster.hichina.com |
Analysis
IP Addresses
course01.net points to a single IP: 39.108.186.86.
Other host names, for instance chaojizb.com, yunmye.com, eyunmy.com, course01.com and course01.cn share IP numbers with course01.net.
Name Servers
course01.net's delegation is to two name servers vip3.alidns.com and vip4.alidns.com.
course01.net shares the same name server configuration as other domains, such as postar.cn, xinhuaapp.com, papcn.cn, ecer.com and ourpow.com.
course01.net at least partially shares its name servers with other domains, for instance dorayy.com, hc-stc.net, bigoads.com, sungrow-re.com and veclightyear.com.
These name servers are commonly used alongside vip1.alidns.com and vip2.alidns.com.
Host names with seven IP numbers:
The host name vip3.alidns.com points to: 2408:4009:500::3, 8.212.93.3, 140.205.1.5, 170.33.32.210, 170.33.40.136, 170.33.73.26 and 170.33.80.10.
The host name vip4.alidns.com points to: 2408:4009:500::4, 8.212.93.4, 140.205.1.6, 170.33.32.211, 170.33.40.137, 170.33.73.27 and 170.33.80.11.
Mail Servers
course01.net is served by a single mail server, mx.ym.163.com.
course01.net uses the same mail server setup as other domains such as jialongglass.com.cn, xiaomenya.com, zndo.cn, zpfilter.com and medinf.cn.
course01.net shares some mail servers with other domains, including cosvn.com, myeyed.cn, deri.io, kinpa.com.cn and lzlly.com.cn.
mx.ym.163.com points to IP number 111.124.200.35.