51ctb.com - robtex.com

51ctb.com

DNSSEC⚠️ Not signed
A47.98.136.56🇨🇳 Alibaba-Cloud47.98.0.0/15 Hangzhou Alibaba Advertising Co.,Ltd.
NSdns1.hichina.com ⭐
A2408:4009:501::9🇨🇳 Alibaba-Cloud2408:4009:501::/48
A39.96.153.43🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC
A39.96.153.63🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC
A47.118.199.203🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.
A47.118.199.213🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.
A120.76.107.43🇨🇳 Alibaba-Cloud120.76.0.0/17
A120.76.107.63🇨🇳 Alibaba-Cloud120.76.0.0/17
A139.224.142.113🇨🇳 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,
A139.224.142.123🇨🇳 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,
NSdns2.hichina.com
A2408:4009:501::10🇨🇳 Alibaba-Cloud2408:4009:501::/48
A39.96.153.44🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC
A39.96.153.54🇨🇳 Alibaba-Cloud39.96.0.0/14 CT BeiJing IDC
A47.118.199.204🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.
A47.118.199.214🇨🇳 Alibaba-Cloud47.118.128.0/17 Alibaba (US) Technology Co., Ltd.
A120.76.107.44🇨🇳 Alibaba-Cloud120.76.0.0/17
A120.76.107.54🇨🇳 Alibaba-Cloud120.76.0.0/17
A139.224.142.114🇨🇳 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,
A139.224.142.124🇨🇳 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,
SOAdns1.hichina.comhostmaster@hichina.com 2026-05-28 #9

com

DNSSEC🔒 Signed (DS record present)
NSa.gtld-servers.net ⭐
NSb.gtld-servers.net
NSc.gtld-servers.net
NSd.gtld-servers.net
NSe.gtld-servers.net
NSf.gtld-servers.net
NSg.gtld-servers.net
NSh.gtld-servers.net
NSi.gtld-servers.net
NSj.gtld-servers.net
NSk.gtld-servers.net
NSl.gtld-servers.net
NSm.gtld-servers.net
SOAa.gtld-servers.netnstld@verisign-grs.com serial=1785931149

Same first word

51ctb.com

Similar names

51cbt.com
51tbc.com
51btc.org
15btc.online

DNS History

12 records (3 active, 9 former)

20162017201820192020202120222023202420252026NSdns1.hichina.comdns2.hichina.comns1.myhostadmin.netns2.myhostadmin.netns3.myhostadmin.netns4.myhostadmin.netns5.myhostadmin.netns6.myhostadmin.netA47.98.136.56103.240.150.74120.26.163.22258.96.188.110
●NSdns1.hichina.com2026-04-13 → 2026-08-05 · 3 obs
○ 2016-12-29 20:57:22
● 2026-04-13 13:51:18
● 2026-08-05 12:10:12
●NSdns2.hichina.com2026-04-13 → 2026-08-05 · 3 obs
○ 2016-12-29 20:57:22
● 2026-04-13 13:51:18
● 2026-08-05 12:10:12
○NSns1.myhostadmin.net2015-08-22 → 2016-12-29 · 4 obs
● 2015-08-22 06:08:40
● 2016-12-29 20:57:22
○ 2026-04-13 13:51:18
○ 2026-08-05 12:10:12
○NSns2.myhostadmin.net2015-08-22 → 2016-12-29 · 4 obs
● 2015-08-22 06:08:40
● 2016-12-29 20:57:22
○ 2026-04-13 13:51:18
○ 2026-08-05 12:10:12
○NSns3.myhostadmin.net2015-08-22 → 2016-12-29 · 4 obs
● 2015-08-22 06:08:40
● 2016-12-29 20:57:22
○ 2026-04-13 13:51:18
○ 2026-08-05 12:10:12
○NSns4.myhostadmin.net2015-08-22 → 2016-12-29 · 4 obs
● 2015-08-22 06:08:40
● 2016-12-29 20:57:22
○ 2026-04-13 13:51:18
○ 2026-08-05 12:10:12
○NSns5.myhostadmin.net2015-08-22 → 2016-12-29 · 4 obs
● 2015-08-22 06:08:40
● 2016-12-29 20:57:22
○ 2026-04-13 13:51:18
○ 2026-08-05 12:10:12
○NSns6.myhostadmin.net2015-08-22 → 2016-12-29 · 4 obs
● 2015-08-22 06:08:40
● 2016-12-29 20:57:22
○ 2026-04-13 13:51:18
○ 2026-08-05 12:10:12
○A103.240.150.742015-08-22 → 2016-01-01 · 4 obs
● 2015-08-22 06:08:40
● 2016-01-01 15:06:32
○ 2016-01-08 07:35:10
○ 2026-08-05 12:10:12
○A120.26.163.2222016-12-23 → 2016-12-29 · 5 obs
○ 2016-07-11 09:11:58
● 2016-12-23 14:58:40
● 2016-12-29 20:57:22
○ 2026-04-13 13:51:18
○ 2026-08-05 12:10:12
●A47.98.136.562026-04-13 → 2026-08-05 · 3 obs
○ 2016-12-29 20:57:22
● 2026-04-13 13:51:18
● 2026-08-05 12:10:12
○A58.96.188.1102016-01-08 → 2016-07-11 · 5 obs
○ 2016-01-01 15:06:32
● 2016-01-08 07:35:10
● 2016-07-11 09:11:58
○ 2016-12-23 14:58:40
○ 2026-08-05 12:10:12

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coma.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...-
51ctb.comdns2.hichina.com, dns1.hichina.com18 records

✅ Authoritative Response

Server:120.76.107.63

NS records: dns2.hichina.com, dns1.hichina.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for 51ctb.com (unsigned zone)

⏱️ Timing

Total: 3877ms | Queries: -

📄 Records

TypeCountSample Data
A147.98.136.56
NS2dns2.hichina.com, dns1.hichina.com
SOA1dns1.hichina.com hostmaster.hichina.com

📌 Glue Records Collected

Total: 18

Out-of-bailiwick: 18 (dns2.hichina.com, dns2.hichina.com, dns2.hichina.com...)

Analysis

IP Addresses

51ctb.com directs to one IP number, which is 47.98.136.56.

51ctb.com shares its IP numbers with other host names, including sdzmjc.com, zmcoal.com, 51shipenji.com and kuangyong1688.com.

Name Servers

The NS records for 51ctb.com delegate to dns1.hichina.com and dns2.hichina.com.

51ctb.com has the same name server delegation as a number of other domains, such as ipo.cn, phcc.cn, metal-oxide.com and two more.

51ctb.com has at least partial name server overlap with other domains, such as airobotic.cn, perfomancehealth.com, jixp.cn and two others.

It is common to find these name servers paired with the name servers ns1.alidns.com, ns2.alidns.com, expirens3.hichina.com and expirens4.hichina.com.

Host names resolving to 9 IP numbers:

dns1.hichina.com maps to 39.96.153.43, 39.96.153.63, 47.118.199.203 and 6 additional IP addresses.

dns2.hichina.com maps to 39.96.153.44, 39.96.153.54, 47.118.199.204 and 6 additional IP addresses.