🛡️Domain Reputation CheckBlocklist, phishing & malware status→

`ctstudy.com`

DNSSEC	⚠️ Not signed
A	2600:1f18:4ae:c605:dd5d:b838:5816:d7fb^{🇺🇸 Amazon2600:1f18::/35 AMAZON EC2 IAD prefix}
A	2600:1f18:4ae:c606:78d4:4260:db4e:aeee^{🇺🇸 Amazon2600:1f18::/35 AMAZON EC2 IAD prefix}
A	13.223.25.84^{🇺🇸 Amazon13.216.0.0/13 EC2 IAD prefix}
A	54.243.117.197^{🇺🇸 Amazon54.242.0.0/15 EC2 IAD prefix}
NS	`ns1.namebrightdns.com` ⭐
		A	2600:1f18:683a:ae1a:401d:c0e9:501a:ea95^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	2600:1f18:683a:ae1b:e84a:f7f7:5ce:2959^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	18.212.76.155^{🇺🇸 Amazon18.208.0.0/13 EC2 IAD prefix}
			PTR	`ec2-18-212-76-155.compute-1.amazonaws.com`
NS	`nsg1.namebrightdns.com`
		A	2600:1f18:683a:ae1a:eb7a:23b2:29d8:e816^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	2600:1f18:683a:ae1b:86d7:e006:2666:13d9^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	2600:1f18:683a:ae1b:c303:3b5:1022:4ab1^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	13.217.214.164^{🇺🇸 Amazon13.216.0.0/13 EC2 IAD prefix}
			PTR	`ec2-13-217-214-164.compute-1.amazonaws.com`
		A	184.72.65.107^{🇺🇸 Amazon184.72.64.0/19 IAD prefix}
			PTR	`ec2-184-72-65-107.compute-1.amazonaws.com`
		A	184.198.87.28^{🇺🇸 Amazon184.192.0.0/10}
			PTR	`ec2-184-198-87-28.compute-1.amazonaws.com`
NS	`nsg2.namebrightdns.com`
		A	2600:1f18:683a:ae1a:4c18:c076:2f6e:fa04^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	2600:1f18:683a:ae1a:73a7:a265:1a90:244c^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	2600:1f18:683a:ae1b:3ec0:1f04:82d2:43f6^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	2600:1f18:683a:ae1b:4147:1105:6a9f:a3a7^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	3.90.244.46^{🇺🇸 Amazon3.80.0.0/12 EC2 IAD prefix}
			PTR	`ec2-3-90-244-46.compute-1.amazonaws.com`
		A	34.227.8.8^{🇺🇸 Amazon34.224.0.0/12 EC2 Region prefix}
			PTR	`ec2-34-227-8-8.compute-1.amazonaws.com`
		A	50.17.97.156^{🇺🇸 Amazon50.17.0.0/16 IAD prefix}
			PTR	`ec2-50-17-97-156.compute-1.amazonaws.com`
		A	54.198.126.254^{🇺🇸 Amazon54.198.0.0/16 EC2 IAD prefix}
			PTR	`ec2-54-198-126-254.compute-1.amazonaws.com`
TXT	`afternic-verification-G9G3tM8T8EwEizzPzjGJWF`
TXT	`v=spf1 -all`
SOA	`ns1.namebrightdns.com`dns@namebright.com 2026-11-09 #1

`com`

	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.net`nstld@verisign-grs.com serial=1794237561

Same first word

ctstudy.com

ctstudy.com.tw

Similar names

tcstudy.com

tcstudy.gov.cn

Previous names

Next names

DNS History

26 records (7 active, 19 former)

○NSdns1.registrar-servers.com2016-02-23 → 2017-03-22 · 4 obs

● 2016-02-23 04:04:08
● 2017-03-22 00:38:38
○ 2020-01-18 11:32:30
○ 2026-11-09 15:35:24

○NSdns1.registrar-servers.com,2016-02-23 → 2016-06-26 · 4 obs

● 2016-02-23 04:04:08
● 2016-06-26 06:05:50
○ 2017-03-22 00:38:38
○ 2026-11-09 15:35:24

○NSdns101.registrar-servers.com2020-01-18 → 2020-01-18 · 4 obs

○ 2017-03-22 00:38:38
● 2020-01-18 11:32:30
○ 2026-10-27 09:31:32
○ 2026-11-09 15:35:24

○NSdns102.registrar-servers.com2020-01-18 → 2020-01-18 · 4 obs

○ 2017-03-22 00:38:38
● 2020-01-18 11:32:30
○ 2026-10-27 09:31:32
○ 2026-11-09 15:35:24

○NSdns2.registrar-servers.com2016-02-23 → 2017-03-22 · 4 obs

● 2016-02-23 04:04:08
● 2017-03-22 00:38:38
○ 2020-01-18 11:32:30
○ 2026-11-09 15:35:24

○NSdns3.registrar-servers.com2016-02-23 → 2016-06-26 · 4 obs

● 2016-02-23 04:04:08
● 2016-06-26 06:05:50
○ 2017-03-22 00:38:38
○ 2026-11-09 15:35:24

○NSdns4.registrar-servers.com2016-02-23 → 2016-06-26 · 4 obs

● 2016-02-23 04:04:08
● 2016-06-26 06:05:50
○ 2017-03-22 00:38:38
○ 2026-11-09 15:35:24

○NSdns5.registrar-servers.com2016-02-23 → 2016-06-26 · 4 obs

● 2016-02-23 04:04:08
● 2016-06-26 06:05:50
○ 2017-03-22 00:38:38
○ 2026-11-09 15:35:24

●NSns1.namebrightdns.com2026-10-27 → 2026-11-09 · 3 obs

○ 2020-01-18 11:32:30
● 2026-10-27 09:31:32
● 2026-11-09 15:35:24

●NSnsg1.namebrightdns.com2026-10-27 → 2026-11-09 · 3 obs

○ 2020-01-18 11:32:30
● 2026-10-27 09:31:32
● 2026-11-09 15:35:24

●NSnsg2.namebrightdns.com2026-10-27 → 2026-11-09 · 3 obs

○ 2020-01-18 11:32:30
● 2026-10-27 09:31:32
● 2026-11-09 15:35:24

○MXeforward1.registrar-servers.com2016-02-23 → 2017-03-22 · 4 obs

● 2016-02-23 04:04:08
● 2017-03-22 00:38:38
○ 2020-01-18 11:32:30
○ 2026-11-09 15:35:24

○MXeforward2.registrar-servers.com2016-02-23 → 2017-03-22 · 4 obs

● 2016-02-23 04:04:08
● 2017-03-22 00:38:38
○ 2020-01-18 11:32:30
○ 2026-11-09 15:35:24

○MXeforward3.registrar-servers.com2016-02-23 → 2017-03-22 · 4 obs

● 2016-02-23 04:04:08
● 2017-03-22 00:38:38
○ 2020-01-18 11:32:30
○ 2026-11-09 15:35:24

○MXeforward4.registrar-servers.com2016-02-23 → 2017-03-22 · 4 obs

● 2016-02-23 04:04:08
● 2017-03-22 00:38:38
○ 2020-01-18 11:32:30
○ 2026-11-09 15:35:24

○MXeforward5.registrar-servers.com2016-02-23 → 2017-03-22 · 4 obs

● 2016-02-23 04:04:08
● 2017-03-22 00:38:38
○ 2020-01-18 11:32:30
○ 2026-11-09 15:35:24

●A13.223.25.842026-10-27 → 2026-11-09 · 3 obs

○ 2020-01-18 11:32:30
● 2026-10-27 09:31:32
● 2026-11-09 15:35:24

○A192.64.119.242017-03-22 → 2017-03-22 · 4 obs

○ 2016-06-26 06:05:50
● 2017-03-22 00:38:38
○ 2020-01-18 11:32:30
○ 2026-11-09 15:35:24

○A192.64.119.802016-02-23 → 2016-06-26 · 4 obs

● 2016-02-23 04:04:08
● 2016-06-26 06:05:50
○ 2017-03-22 00:38:38
○ 2026-11-09 15:35:24

○A198.54.117.1972020-01-18 → 2020-01-18 · 4 obs

○ 2017-03-22 00:38:38
● 2020-01-18 11:32:30
○ 2026-10-27 09:31:32
○ 2026-11-09 15:35:24

○A198.54.117.1982020-01-18 → 2020-01-18 · 4 obs

○ 2017-03-22 00:38:38
● 2020-01-18 11:32:30
○ 2026-10-27 09:31:32
○ 2026-11-09 15:35:24

○A198.54.117.1992020-01-18 → 2020-01-18 · 4 obs

○ 2017-03-22 00:38:38
● 2020-01-18 11:32:30
○ 2026-10-27 09:31:32
○ 2026-11-09 15:35:24

○A198.54.117.2002020-01-18 → 2020-01-18 · 4 obs

○ 2017-03-22 00:38:38
● 2020-01-18 11:32:30
○ 2026-10-27 09:31:32
○ 2026-11-09 15:35:24

●A2600:1f18:4ae:c605:dd5d:b838:5816:d7fb2026-10-27 → 2026-11-09 · 3 obs

○ 2020-01-18 11:32:30
● 2026-10-27 09:31:32
● 2026-11-09 15:35:24

●A2600:1f18:4ae:c606:78d4:4260:db4e:aeee2026-10-27 → 2026-11-09 · 3 obs

○ 2020-01-18 11:32:30
● 2026-10-27 09:31:32
● 2026-11-09 15:35:24

●A54.243.117.1972026-10-27 → 2026-11-09 · 3 obs

○ 2020-01-18 11:32:30
● 2026-10-27 09:31:32
● 2026-11-09 15:35:24

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	k.gtld-servers.net, i.gtld-servers.net, f.gtld-servers.net, b.gtld-servers.net...	-
ctstudy.com	nsg1.namebrightdns.com, nsg2.namebrightdns.com	14 records

✅ Authoritative Response

Server:184.72.65.107

NS records: nsg1.namebrightdns.com, nsg2.namebrightdns.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for ctstudy.com (unsigned zone)

⏱️ Timing

Total: 148ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`13.223.25.84, 54.243.117.197`
AAAA	2	`2600:1f18:4ae:c605:dd5d:b838:5816:d7fb, 2600:1f18:4ae:c606:78d4:4260:db4e:aeee`
NS	2	`nsg1.namebrightdns.com, nsg2.namebrightdns.com`
TXT	2	`afternic-verification-G9G3tM8T8EwEizzPzj, v=spf1 -all`
SOA	1	`ns1.namebrightdns.com dns.namebright.com`

📌 Glue Records Collected

Total: 14

Out-of-bailiwick: 14 (nsg1.namebrightdns.com, nsg1.namebrightdns.com, nsg1.namebrightdns.com...)

Analysis

IP Addresses

ctstudy.com directs to four IP numbers, which are 13.223.25.84, 54.243.117.197, 2600:1f18:4ae:c605:dd5d:b838:5816:d7fb and 2600:1f18:4ae:c606:78d4:4260:db4e:aeee.

Among the host names that share IP numbers with ctstudy.com are sonbuilders.com, moneyclimate.com, thateditor.com and two others.

Name Servers

DNS for ctstudy.com is handled by three authoritative name servers: ns1.namebrightdns.com, nsg1.namebrightdns.com and nsg2.namebrightdns.com.

The name servers of ctstudy.com overlap at least partially with those of other domains — among them mail.mezesphere.com, ns1.grace99.com, officemyoffice.com and two more.

These name servers commonly appear alongside the name servers domain-for-sale.hugedomainsdns.com and forsale.hugedomainsdns.com.

Host names resolving to 8 IP numbers:

nsg2.namebrightdns.com has IP addresses 3.90.244.46, 34.227.8.8 and 50.17.97.156, plus 5 other.

Host names resolving to 6 IP numbers:

nsg1.namebrightdns.com has IP addresses 13.217.214.164, 184.72.65.107 and 184.198.87.28, plus 3 other.

Hosts with three IP address records:

ns1.namebrightdns.com has IP addresses 18.212.76.155, 2600:1f18:683a:ae1a:401d:c0e9:501a:ea95 and 2600:1f18:683a:ae1b:e84a:f7f7:5ce:2959.

ctstudy.com - robtex.com

ctstudy.com

com

Same first word

Similar names

Previous names

Next names

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

📌 Glue Records Collected

Analysis

IP Addresses

Name Servers

`ctstudy.com`

`com`