course4.com - dns.ninja

`course4.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:6900:d1bd:7672:d0ca^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	2600:1f18:683a:ae1a:7bc2:638d:8ca6:fcc4^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	2600:1f18:683a:ae1b:d57d:390a:64b4:d4f1^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	52.203.211.134^{🇺🇸 Amazon52.200.0.0/13 EC2 IAD prefix}
			PTR	`ec2-52-203-211-134.compute-1.amazonaws.com`
		A	52.204.81.90^{🇺🇸 Amazon52.200.0.0/13 EC2 IAD prefix}
			PTR	`ec2-52-204-81-90.compute-1.amazonaws.com`
NS	`nsg1.namebrightdns.com`
		A	2600:1f18:683a:ae1a:4a5c:f736:fa58:d85^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	2600:1f18:683a:ae1b:5b81:82bc:6de0:b02c^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	2600:1f18:683a:ae1b:a80d:aa66:fb:1e18^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	3.88.240.25^{🇺🇸 Amazon3.80.0.0/12 EC2 IAD prefix}
			PTR	`ec2-3-88-240-25.compute-1.amazonaws.com`
		A	52.55.198.41^{🇺🇸 Amazon52.54.0.0/15 EC2 Region prefix}
			PTR	`ec2-52-55-198-41.compute-1.amazonaws.com`
		A	54.175.130.15^{🇺🇸 Amazon54.174.0.0/15 EC2 IAD prefix}
			PTR	`ec2-54-175-130-15.compute-1.amazonaws.com`
NS	`nsg2.namebrightdns.com`
		A	2600:1f18:683a:ae1a:7b03:f4b:4bfa:8287^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	2600:1f18:683a:ae1a:cc5d:cd19:dd5:828e^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	2600:1f18:683a:ae1b:3ee4:3218:624e:fbef^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	3.80.109.14^{🇺🇸 Amazon3.80.0.0/12 EC2 IAD prefix}
			PTR	`ec2-3-80-109-14.compute-1.amazonaws.com`
		A	18.232.139.44^{🇺🇸 Amazon18.232.0.0/14 EC2 IAD prefix}
			PTR	`ec2-18-232-139-44.compute-1.amazonaws.com`
		A	98.81.3.34^{🇺🇸 Amazon98.80.0.0/13 EC2 IAD Prefix}
			PTR	`ec2-98-81-3-34.compute-1.amazonaws.com`
TXT	`afternic-verification-G9G3tM8T8EwEizzPzjGJWF`
TXT	`v=spf1 -all`
SOA	`ns1.namebrightdns.com`dns@namebright.com 2026-06-28 #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=1782630885

Same first word

course4.com

Similar names

4uscore.com

cores4u.com

4source.de

source4.com

source4.me

score4u.de

4source.com

source4.de

4course.com

score4u.com

DNS History

21 records (7 active, 14 former)

●NSns1.namebrightdns.com2015-10-09 → 2026-06-28 · 8 obs

● 2015-10-09 00:22:08
● 2015-12-09 13:52:40
○ 2016-03-25 10:26:32
● 2016-09-10 02:48:10
● 2026-04-09 09:45:50
○ 2026-04-09 22:04:50
● 2026-04-11 08:10:50
● 2026-06-28 07:33:54

○NSns2.namebrightdns.com2015-10-09 → 2017-04-20 · 7 obs

● 2015-10-09 00:22:08
○ 2015-12-09 13:52:40
○ 2016-03-25 10:26:32
● 2016-09-10 02:48:10
● 2017-04-20 20:57:50
○ 2026-02-21 03:22:32
○ 2026-06-28 07:33:54

●NSnsg1.namebrightdns.com2015-12-09 → 2026-06-28 · 7 obs

○ 2015-10-09 00:22:08
● 2015-12-09 13:52:40
● 2016-03-25 10:26:32
○ 2016-09-10 02:48:10
○ 2017-04-20 20:57:50
● 2026-02-21 03:22:32
● 2026-06-28 07:33:54

●NSnsg2.namebrightdns.com2015-12-09 → 2026-06-28 · 7 obs

○ 2015-10-09 00:22:08
● 2015-12-09 13:52:40
● 2016-03-25 10:26:32
○ 2016-09-10 02:48:10
○ 2017-04-20 20:57:50
● 2026-02-21 03:22:32
● 2026-06-28 07:33:54

○A107.23.198.2402016-09-10 → 2016-09-10 · 4 obs

○ 2016-03-25 10:26:32
● 2016-09-10 02:48:10
○ 2017-04-20 20:57:50
○ 2026-06-28 07:33:54

●A13.223.25.842026-02-21 → 2026-06-28 · 6 obs

○ 2017-04-20 20:57:50
● 2026-02-21 03:22:32
● 2026-04-09 09:45:50
○ 2026-04-09 22:04:50
● 2026-04-11 08:10:50
● 2026-06-28 07:33:54

●A2600:1f18:4ae:c605:dd5d:b838:5816:d7fb2026-02-21 → 2026-06-28 · 6 obs

○ 2017-04-20 20:57:50
● 2026-02-21 03:22:32
● 2026-04-09 09:45:50
○ 2026-04-09 22:04:50
● 2026-04-11 08:10:50
● 2026-06-28 07:33:54

●A2600:1f18:4ae:c606:78d4:4260:db4e:aeee2026-02-21 → 2026-06-28 · 6 obs

○ 2017-04-20 20:57:50
● 2026-02-21 03:22:32
● 2026-04-09 09:45:50
○ 2026-04-09 22:04:50
● 2026-04-11 08:10:50
● 2026-06-28 07:33:54

○A52.204.129.222017-04-20 → 2017-04-20 · 4 obs

○ 2016-09-10 02:48:10
● 2017-04-20 20:57:50
○ 2026-02-21 03:22:32
○ 2026-06-28 07:33:54

○A52.206.43.2342016-09-10 → 2016-09-10 · 4 obs

○ 2016-03-25 10:26:32
● 2016-09-10 02:48:10
○ 2017-04-20 20:57:50
○ 2026-06-28 07:33:54

○A52.21.180.2332016-03-25 → 2016-03-25 · 4 obs

○ 2015-12-09 13:52:40
● 2016-03-25 10:26:32
○ 2016-09-10 02:48:10
○ 2026-06-28 07:33:54

○A52.3.120.902016-03-25 → 2016-03-25 · 4 obs

○ 2015-12-09 13:52:40
● 2016-03-25 10:26:32
○ 2016-09-10 02:48:10
○ 2026-06-28 07:33:54

○A52.4.72.1372016-09-10 → 2016-09-10 · 4 obs

○ 2016-03-25 10:26:32
● 2016-09-10 02:48:10
○ 2017-04-20 20:57:50
○ 2026-06-28 07:33:54

○A54.174.31.2542015-10-09 → 2015-12-09 · 4 obs

● 2015-10-09 00:22:08
● 2015-12-09 13:52:40
○ 2016-03-25 10:26:32
○ 2026-06-28 07:33:54

○A54.208.74.2152015-10-09 → 2015-12-09 · 4 obs

● 2015-10-09 00:22:08
● 2015-12-09 13:52:40
○ 2016-03-25 10:26:32
○ 2026-06-28 07:33:54

○A54.210.33.1902016-09-10 → 2016-09-10 · 4 obs

○ 2016-03-25 10:26:32
● 2016-09-10 02:48:10
○ 2017-04-20 20:57:50
○ 2026-06-28 07:33:54

○A54.236.123.2242016-09-10 → 2016-09-10 · 4 obs

○ 2016-03-25 10:26:32
● 2016-09-10 02:48:10
○ 2017-04-20 20:57:50
○ 2026-06-28 07:33:54

●A54.243.117.1972026-02-21 → 2026-06-28 · 6 obs

○ 2017-04-20 20:57:50
● 2026-02-21 03:22:32
● 2026-04-09 09:45:50
○ 2026-04-09 22:04:50
● 2026-04-11 08:10:50
● 2026-06-28 07:33:54

○A54.85.127.702017-04-20 → 2017-04-20 · 4 obs

○ 2016-09-10 02:48:10
● 2017-04-20 20:57:50
○ 2026-02-21 03:22:32
○ 2026-06-28 07:33:54

○CNAMEhdredirect-lb-399551664.us-east-1.elb.amazonaws.com2015-10-09 → 2016-09-10 · 4 obs

● 2015-10-09 00:22:08
● 2016-09-10 02:48:10
○ 2017-04-20 20:57:50
○ 2026-06-28 07:33:54

○CNAMEhdredirect-lb3-890977680.us-east-1.elb.amazonaws.com2017-04-20 → 2017-04-20 · 4 obs

○ 2016-09-10 02:48:10
● 2017-04-20 20:57:50
○ 2026-02-21 03:22:32
○ 2026-06-28 07:33:54

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
course4.com	nsg1.namebrightdns.com, nsg2.namebrightdns.com	12 records

✅ Authoritative Response

Server:18.232.139.44

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for course4.com (unsigned zone)

⏱️ Timing

Total: 835ms | 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	`nsg2.namebrightdns.com, nsg1.namebrightdns.com`
TXT	2	`v=spf1 -all, afternic-verification-G9G3tM8T8EwEizzPzj`
SOA	1	`ns1.namebrightdns.com dns.namebright.com`

📌 Glue Records Collected

Total: 12

Out-of-bailiwick: 12 (nsg1.namebrightdns.com, nsg1.namebrightdns.com, nsg1.namebrightdns.com...)

Analysis

IP Addresses

course4.com resolves to four IP addresses: 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.

www.flashsante.com, gojoa.com, detoxintensive.com and two other host names share IP numbers with course4.com.

Name Servers

DNS for course4.com is handled by three authoritative name servers: ns1.namebrightdns.com, nsg1.namebrightdns.com and nsg2.namebrightdns.com.

course4.com has at least partial name server overlap with other domains, such as multiferreterias.com, optimizesports.com, silentweekend.com and two others.

These name servers tend to appear together with the name servers ns2.namebrightdns.com, domain-for-sale.hugedomainsdns.com and forsale.hugedomainsdns.com.

Hostnames that resolve to 6 IP addresses:

nsg1.namebrightdns.com has IP addresses 3.88.240.25, 52.55.198.41 and 54.175.130.15, plus 3 other.

nsg2.namebrightdns.com has IP addresses 3.80.109.14, 18.232.139.44 and 98.81.3.34, plus 3 other.

Hostnames pointing to five IP numbers:

ns1.namebrightdns.com resolves to four IP addresses: 52.203.211.134, 52.204.81.90, 2600:1f18:683a:ae1a:6900:d1bd:7672:d0ca and two others.