ctbook.cn - robtex.com
ctbook.cn
| DNSSEC | ⚠️ Not signed | ||||||
| A | 121.4.8.2🇨🇳 TENCENT-NET-AP121.4.8.0/21 | ||||||
| NS | dns15.hichina.com ⭐ | ||||||
| A | 2408:4009:501::23🇨🇳 Alibaba-Cloud2408:4009:501::/48 | ||||||
| A | 39.96.153.42🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC | ||||||
| A | 39.96.153.52🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC | ||||||
| A | 47.118.199.202🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd. | ||||||
| A | 47.118.199.212🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd. | ||||||
| A | 120.76.107.42🇨🇳 Alibaba-Cloud120.76.0.0/17 | ||||||
| A | 120.76.107.52🇨🇳 Alibaba-Cloud120.76.0.0/17 | ||||||
| A | 139.224.142.112🇨🇳 Alibaba-Cloud139.224.128.0/17 China Internet Network Information Center Floor1, Building No.1 C/-Chinese Academy of Sciences 4, South 4th Street Haidian District, | ||||||
| A | 139.224.142.122🇨🇳 Alibaba-Cloud139.224.128.0/17 China Internet Network Information Center Floor1, Building No.1 C/-Chinese Academy of Sciences 4, South 4th Street Haidian District, | ||||||
| NS | dns16.hichina.com | ||||||
| A | 2408:4009:501::24🇨🇳 Alibaba-Cloud2408:4009:501::/48 | ||||||
| A | 39.96.153.41🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC | ||||||
| A | 39.96.153.51🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC | ||||||
| A | 47.118.199.201🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd. | ||||||
| A | 47.118.199.211🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd. | ||||||
| A | 120.76.107.41🇨🇳 Alibaba-Cloud120.76.0.0/17 | ||||||
| A | 120.76.107.51🇨🇳 Alibaba-Cloud120.76.0.0/17 | ||||||
| A | 139.224.142.111🇨🇳 Alibaba-Cloud139.224.128.0/17 China Internet Network Information Center Floor1, Building No.1 C/-Chinese Academy of Sciences 4, South 4th Street Haidian District, | ||||||
| A | 139.224.142.121🇨🇳 Alibaba-Cloud139.224.128.0/17 China Internet Network Information Center Floor1, Building No.1 C/-Chinese Academy of Sciences 4, South 4th Street Haidian District, | ||||||
| MX | mxbiz1.qq.com ⭐ | ||||||
| MX | mxbiz2.qq.com(10) | ||||||
| TXT | v=spf1 include:spf.mail.qq.com ~all | ||||||
| SOA | dns15.hichina.comhostmaster@hichina.com 2026-01-12 #9 | ||||||
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=2034618310 | ||||||
Subdomains
www.ctbook.cn |
Same first word
ctbook.cn |
Similar names
DNS History
8 records (5 active, 3 former)
●NSdns15.hichina.com2026-03-14 → 2026-04-01 · 3 obs
● 2026-03-14 22:57:10
● 2026-04-01 00:54:02
●NSdns16.hichina.com2026-03-14 → 2026-04-01 · 3 obs
● 2026-03-14 22:57:10
● 2026-04-01 00:54:02
○NSf1g1ns1.dnspod.net2017-08-02 → 2017-08-02 · 3 obs
○ 2026-03-14 22:57:10
○ 2026-04-01 00:54:02
○NSf1g1ns2.dnspod.net2017-08-02 → 2017-08-02 · 3 obs
○ 2026-03-14 22:57:10
○ 2026-04-01 00:54:02
●A121.4.8.22026-03-14 → 2026-04-01 · 3 obs
● 2026-03-14 22:57:10
● 2026-04-01 00:54:02
○A139.199.218.2282017-08-02 → 2017-08-02 · 3 obs
○ 2026-03-14 22:57:10
○ 2026-04-01 00:54:02
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cn | a.dns.cn, b.dns.cn, c.dns.cn, d.dns.cn... | - |
| ctbook.cn | dns15.hichina.com, dns16.hichina.com | - |
✅ Authoritative Response
Server:39.96.153.51
NS records: dns15.hichina.com, dns16.hichina.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for ctbook.cn (unsigned zone)
⏱️ Timing
Total: 1741ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 121.4.8.2 |
| NS | 2 | dns15.hichina.com, dns16.hichina.com |
| MX | 2 | mxbiz1.qq.com (pri: 5), mxbiz2.qq.com (pri: 10) |
| TXT | 1 | v=spf1 include:spf.mail.qq.com ~all |
| SOA | 1 | dns15.hichina.com hostmaster.hichina.com |
Analysis
Hierarchy
ctbook.cn is a parent of www.ctbook.cn.
IP Addresses
ctbook.cn points to a single IP address: 121.4.8.2.
Name Servers
ctbook.cn is delegated to two name servers: dns15.hichina.com and dns16.hichina.com.
ctbook.cn uses the same name server setup as other domains, including yortho.com, bmjzkj.com, tigersean.com, crosscp.com and tfsteam.com.
At least part of the name servers for ctbook.cn are shared with other domains, for instance sd-wm-av.com, tuotu.org, hebddd.com, ygpt.vip and zgjcjy.org.
These name servers are commonly used with expirens3.hichina.com, expirens4.hichina.com, ns7.alidns.com and ns8.alidns.com.
Host names with nine IP numbers:
dns15.hichina.com points to: 2408:4009:501::23, 39.96.153.42, 39.96.153.52, 47.118.199.202, 47.118.199.212, 120.76.107.42, 120.76.107.52, 139.224.142.112 and 139.224.142.122.
dns16.hichina.com points to: 2408:4009:501::24, 39.96.153.41, 39.96.153.51, 47.118.199.201, 47.118.199.211, 120.76.107.41, 120.76.107.51, 139.224.142.111 and 139.224.142.121.
Mail Servers
ctbook.cn is handled by two mail servers: mxbiz1.qq.com and mxbiz2.qq.com.
ctbook.cn uses the same mail server setup as other domains, for instance gothetic.com, csmzxy.edu.cn, ahyuda.com, buy-tool.com and dsm-mc.com.
ctbook.cn shares at least some mail servers with other domains, for example anrre.com, www.rechoo.com, busky.com.cn, sharewellgroup.com and haiter.cn.
these mail servers are often used together with mxn.mxhichina.com and mxw.mxhichina.com.