coursebuilder.com - dns.ninja

`coursebuilder.com`

DNSSEC	⚠️ Not signed
A	52.55.129.216^{🇺🇸 Amazon52.54.0.0/15 EC2 Region prefix}
		PTR	`ec2-52-55-129-216.compute-1.amazonaws.com`
A	98.88.222.245^{🇺🇸 Amazon98.88.0.0/13 EC2 IAD prefix}
A	100.62.158.221^{🇺🇸 Amazon100.48.0.0/12 EC2 IAD prefix}
NS	`ns-1410.awsdns-48.org` ⭐
		A	2600:9000:5305:8200::1^{🇺🇸 Amazon2600:9000:5305::/48 - CloudFront}
			PTR	`ns-1410.awsdns-48.org`
		A	205.251.197.130^{🇺🇸 Amazon205.251.197.0/24 prefix}
			PTR	`ns-1410.awsdns-48.org`
NS	`ns-1640.awsdns-13.co.uk`
		A	2600:9000:5306:6800::1^{🇺🇸 Amazon2600:9000:5306::/48 - CloudFront}
			PTR	`ns-1640.awsdns-13.co.uk`
		A	205.251.198.104^{🇺🇸 Amazon205.251.198.0/24 prefix}
			PTR	`ns-1640.awsdns-13.co.uk`
NS	`ns-21.awsdns-02.com`
		A	2600:9000:5300:1500::1^{🇺🇸 Amazon2600:9000:5300::/48 - CloudFront}
			PTR	`ns-21.awsdns-02.com`
		A	205.251.192.21^{🇺🇸 Amazon205.251.192.0/24 prefix}
			PTR	`ns-21.awsdns-02.com`
NS	`ns-764.awsdns-31.net`
		A	2600:9000:5302:fc00::1^{🇺🇸 Amazon2600:9000:5302::/48 - CloudFront}
			PTR	`ns-764.awsdns-31.net`
		A	205.251.194.252^{🇺🇸 Amazon205.251.194.0/24 prefix}
			PTR	`ns-764.awsdns-31.net`
TXT	`google-site-verification=izGMPoNUn6YNrEBIXwIyqMAtOo9WcJyIYwO2CjARMGY`
SOA	`ns-1410.awsdns-48.org`awsdns-hostmaster@amazon.com serial=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=1786690599

WOT: SUSPICIOUS (1/100)

Same first word

coursebuilder.de

coursebuilder.ca

coursebuilder.withgoogle.com

coursebuilder.nl

coursebuilder.com

coursebuilder.com.au

Similar names

coeurbuilders.com

sourcebuilder.xyz

buildresource.com

sourcebuilder.net

ucorebuilders.com

buildresource.sbs

DNS History

35 records (7 active, 28 former)

●NSns-1410.awsdns-48.org2026-02-26 → 2026-08-14 · 3 obs

○ 2017-02-11 23:22:28
● 2026-02-26 01:50:56
● 2026-08-14 07:10:24

●NSns-1640.awsdns-13.co.uk2026-02-26 → 2026-08-14 · 3 obs

○ 2017-02-11 23:22:28
● 2026-02-26 01:50:56
● 2026-08-14 07:10:24

●NSns-21.awsdns-02.com2026-02-26 → 2026-08-14 · 3 obs

○ 2017-02-11 23:22:28
● 2026-02-26 01:50:56
● 2026-08-14 07:10:24

●NSns-764.awsdns-31.net2026-02-26 → 2026-08-14 · 3 obs

○ 2017-02-11 23:22:28
● 2026-02-26 01:50:56
● 2026-08-14 07:10:24

○NSns1.coursebuilder.com2015-11-16 → 2015-11-16 · 4 obs

○ 2015-07-15 08:42:00
● 2015-11-16 17:27:28
○ 2016-02-09 01:35:24
○ 2026-08-14 07:10:24

○NSns1.dsredirection.com2007-11-12 → 2007-11-12 · 3 obs

● 2007-11-12 13:19:44
○ 2015-07-15 08:42:00
○ 2026-08-14 07:10:24

○NSns1.smtmdns.com2015-07-15 → 2017-02-11 · 7 obs

○ 2007-11-12 13:19:44
● 2015-07-15 08:42:00
○ 2015-11-16 17:27:28
● 2016-02-09 01:35:24
● 2017-02-11 23:22:28
○ 2026-02-26 01:50:56
○ 2026-08-14 07:10:24

○NSns2.dsredirection.com2007-11-12 → 2007-11-12 · 3 obs

● 2007-11-12 13:19:44
○ 2015-07-15 08:42:00
○ 2026-08-14 07:10:24

○NSns2.smtmdns.com2015-07-15 → 2017-02-11 · 7 obs

○ 2007-11-12 13:19:44
● 2015-07-15 08:42:00
○ 2015-11-16 17:27:28
● 2016-02-09 01:35:24
● 2017-02-11 23:22:28
○ 2026-02-26 01:50:56
○ 2026-08-14 07:10:24

○A100.50.110.2522026-03-25 → 2026-03-25 · 4 obs

○ 2026-02-26 01:50:56
● 2026-03-25 15:07:04
○ 2026-06-20 01:42:10
○ 2026-08-14 07:10:24

○A100.52.118.2372026-07-07 → 2026-07-07 · 4 obs

○ 2026-06-20 01:42:10
● 2026-07-07 20:54:58
○ 2026-08-14 07:10:22
○ 2026-08-14 07:10:24

○A100.55.147.1282026-07-07 → 2026-07-07 · 4 obs

○ 2026-06-20 01:42:10
● 2026-07-07 20:54:58
○ 2026-07-15 09:24:26
○ 2026-08-14 07:10:24

○A100.58.152.312026-06-20 → 2026-06-20 · 4 obs

○ 2026-03-25 15:07:04
● 2026-06-20 01:42:10
○ 2026-07-07 20:54:58
○ 2026-08-14 07:10:24

●A100.62.158.2212026-08-14 → 2026-08-14 · 3 obs

○ 2026-07-15 09:24:26
● 2026-08-14 07:10:22
● 2026-08-14 07:10:24

○A107.20.242.1862026-02-26 → 2026-02-26 · 4 obs

○ 2017-02-11 23:22:28
● 2026-02-26 01:50:56
○ 2026-03-25 15:07:04
○ 2026-08-14 07:10:24

○A107.21.51.892026-03-25 → 2026-03-25 · 4 obs

○ 2026-02-26 01:50:56
● 2026-03-25 15:07:04
○ 2026-06-20 01:42:10
○ 2026-08-14 07:10:24

○A13.216.21.1042026-02-26 → 2026-02-26 · 4 obs

○ 2017-02-11 23:22:28
● 2026-02-26 01:50:56
○ 2026-03-25 15:07:04
○ 2026-08-14 07:10:24

○A208.73.212.122007-11-12 → 2007-11-12 · 3 obs

● 2007-11-12 13:19:44
○ 2015-07-15 08:42:00
○ 2026-08-14 07:10:24

○A216.157.88.252017-02-11 → 2017-02-11 · 4 obs

○ 2016-05-03 01:29:44
● 2017-02-11 23:22:28
○ 2026-02-26 01:50:56
○ 2026-08-14 07:10:24

○A32.199.110.2542026-06-20 → 2026-06-20 · 4 obs

○ 2026-03-25 15:07:04
● 2026-06-20 01:42:10
○ 2026-07-07 20:54:58
○ 2026-08-14 07:10:24

○A34.198.69.1032026-02-26 → 2026-08-14 · 2 obs

○ 2026-02-26 01:50:56
○ 2026-08-14 07:10:24

○A35.172.10.962026-06-20 → 2026-06-20 · 4 obs

○ 2026-03-25 15:07:04
● 2026-06-20 01:42:10
○ 2026-07-07 20:54:58
○ 2026-08-14 07:10:24

○A44.206.101.2552026-02-26 → 2026-08-14 · 2 obs

○ 2026-02-26 01:50:56
○ 2026-08-14 07:10:24

○A44.212.188.2532026-07-15 → 2026-07-15 · 4 obs

○ 2026-07-07 20:54:58
● 2026-07-15 09:24:26
○ 2026-08-14 07:10:22
○ 2026-08-14 07:10:24

○A44.214.122.1562026-07-15 → 2026-07-15 · 4 obs

○ 2026-07-07 20:54:58
● 2026-07-15 09:24:26
○ 2026-08-14 07:10:22
○ 2026-08-14 07:10:24

○A44.218.151.142026-07-07 → 2026-07-07 · 4 obs

○ 2026-06-20 01:42:10
● 2026-07-07 20:54:58
○ 2026-07-15 09:24:26
○ 2026-08-14 07:10:24

●A52.55.129.2162026-08-14 → 2026-08-14 · 3 obs

○ 2026-07-15 09:24:26
● 2026-08-14 07:10:22
● 2026-08-14 07:10:24

○A54.157.240.692026-02-26 → 2026-08-14 · 2 obs

○ 2026-02-26 01:50:56
○ 2026-08-14 07:10:24

○A54.225.87.922026-03-25 → 2026-03-25 · 4 obs

○ 2026-02-26 01:50:56
● 2026-03-25 15:07:04
○ 2026-06-20 01:42:10
○ 2026-08-14 07:10:24

○A66.135.47.1252015-07-15 → 2015-07-15 · 4 obs

○ 2007-11-12 13:19:44
● 2015-07-15 08:42:00
○ 2017-02-11 23:22:28
○ 2026-08-14 07:10:24

○A66.135.47.1292016-05-03 → 2016-05-03 · 4 obs

○ 2016-02-09 01:35:24
● 2016-05-03 01:29:44
○ 2017-02-11 23:22:28
○ 2026-08-14 07:10:24

○A85.17.25.2142017-02-11 → 2017-02-11 · 4 obs

○ 2016-05-03 01:29:44
● 2017-02-11 23:22:28
○ 2026-02-26 01:50:56
○ 2026-08-14 07:10:24

○A85.17.25.2422015-07-15 → 2016-02-09 · 5 obs

○ 2007-11-12 13:19:44
● 2015-07-15 08:42:00
● 2016-02-09 01:35:24
○ 2016-05-03 01:29:44
○ 2026-08-14 07:10:24

●A98.88.222.2452026-08-14 → 2026-08-14 · 3 obs

○ 2026-07-15 09:24:26
● 2026-08-14 07:10:22
● 2026-08-14 07:10:24

○A98.89.86.02026-02-26 → 2026-02-26 · 4 obs

○ 2017-02-11 23:22:28
● 2026-02-26 01:50:56
○ 2026-03-25 15:07:04
○ 2026-08-14 07:10:24

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	h.gtld-servers.net, e.gtld-servers.net, g.gtld-servers.net, m.gtld-servers.net...	-
coursebuilder.com	ns-21.awsdns-02.com, ns-764.awsdns-31.net, ns-1640.awsdns-13.co.uk, ns-1410.awsdns-48.org	2 records

✅ Authoritative Response

Server:205.251.192.21

NS records: ns-21.awsdns-02.com, ns-764.awsdns-31.net, ns-1640.awsdns-13.co.uk, ns-1410.awsdns-48.org

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for coursebuilder.com (unsigned zone)

⏱️ Timing

Total: 461ms | Queries: -

📄 Records

Type	Count	Sample Data
A	3	`98.88.222.245, 52.55.129.216...`
NS	4	`ns-1410.awsdns-48.org, ns-1640.awsdns-13.co.uk...`
TXT	1	`google-site-verification=izGMPoNUn6YNrEB`
SOA	1	`ns-1410.awsdns-48.org awsdns-hostmaster.`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns-21.awsdns-02.com, ns-21.awsdns-02.com)

Analysis

IP Addresses

coursebuilder.com maps to three IP numbers — 52.55.129.216, 98.88.222.245 and 100.62.158.221.

Name Servers

coursebuilder.com has four authoritative name servers: ns-21.awsdns-02.com, ns-764.awsdns-31.net, ns-1410.awsdns-48.org and ns-1640.awsdns-13.co.uk.

coursebuilder.com has at least partial name server overlap with other domains, such as klikon.com, dj-goetz.com, quad-rant.com and two others.

ns-21.awsdns-02.com, ns-764.awsdns-31.net, ns-1410.awsdns-48.org and ns-1640.awsdns-13.co.uk all point to exactly two IP numbers each: ns-21.awsdns-02.com → 205.251.192.21 and 2600:9000:5300:1500::1; ns-764.awsdns-31.net → 205.251.194.252 and 2600:9000:5302:fc00::1; ns-1410.awsdns-48.org → 205.251.197.130 and 2600:9000:5305:8200::1; ns-1640.awsdns-13.co.uk → 205.251.198.104 and 2600:9000:5306:6800::1.