precourse.com - dns.ninja

`precourse.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:303c:9b15:3db3:a8a2^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	2600:1f18:683a:ae1a:9b5a:7d38:2d23:6714^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	2600:1f18:683a:ae1b:6fa6:bf7e:9de7:5e92^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	54.80.151.113^{🇺🇸 Amazon54.80.0.0/14 EC2 IAD prefix}
			PTR	`ec2-54-80-151-113.compute-1.amazonaws.com`
		A	54.89.201.236^{🇺🇸 Amazon54.89.0.0/16 EC2 IAD prefix}
			PTR	`ec2-54-89-201-236.compute-1.amazonaws.com`
		A	54.234.103.190^{🇺🇸 Amazon54.234.0.0/15 EC2 IAD prefix}
			PTR	`ec2-54-234-103-190.compute-1.amazonaws.com`
NS	`nsg2.namebrightdns.com`
		A	2600:1f18:683a:ae1a:f535:3a35:f979:7d42^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	2600:1f18:683a:ae1b:9495:4bb7:fbde:b015^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	2600:1f18:683a:ae1b:f6ec:2543:1b2e:f83c^{🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix}
		A	3.90.140.102^{🇺🇸 Amazon3.80.0.0/12 EC2 IAD prefix}
			PTR	`ec2-3-90-140-102.compute-1.amazonaws.com`
		A	54.221.37.2^{🇺🇸 Amazon54.221.0.0/16 EC2 IAD prefix}
			PTR	`ec2-54-221-37-2.compute-1.amazonaws.com`
		A	54.225.31.228^{🇺🇸 Amazon54.224.0.0/15 EC2 IAD prefix}
			PTR	`ec2-54-225-31-228.compute-1.amazonaws.com`
TXT	`afternic-verification-G9G3tM8T8EwEizzPzjGJWF`
TXT	`v=spf1 -all`
SOA	`ns1.namebrightdns.com`dns@namebright.com 2026-07-18 #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=1784405522

Same first word

precourse.cn

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DNS History

23 records (7 active, 16 former)

●NSns1.namebrightdns.com2015-08-20 → 2026-07-18 · 3 obs

○ 2008-03-17 11:32:44
● 2015-08-20 23:03:18
● 2026-07-18 20:20:32

○NSns2.namebrightdns.com2015-12-17 → 2017-05-15 · 5 obs

○ 2015-08-20 23:03:18
● 2015-12-17 02:37:04
● 2017-05-15 14:35:54
○ 2026-03-17 09:18:30
○ 2026-07-18 20:20:32

●NSnsg1.namebrightdns.com2015-08-20 → 2026-07-18 · 6 obs

○ 2008-03-17 11:32:44
● 2015-08-20 23:03:18
○ 2015-12-17 02:37:04
○ 2017-05-15 14:35:54
● 2026-03-17 09:18:30
● 2026-07-18 20:20:32

●NSnsg2.namebrightdns.com2015-08-20 → 2026-07-18 · 6 obs

○ 2008-03-17 11:32:44
● 2015-08-20 23:03:18
○ 2015-12-17 02:37:04
○ 2017-05-15 14:35:54
● 2026-03-17 09:18:30
● 2026-07-18 20:20:32

○A107.23.160.2182015-12-17 → 2015-12-17 · 4 obs

○ 2015-08-20 23:03:18
● 2015-12-17 02:37:04
○ 2016-03-18 05:28:22
○ 2026-07-18 20:20:32

○A107.23.198.2402016-10-02 → 2016-10-02 · 4 obs

○ 2016-03-18 05:28:22
● 2016-10-02 08:04:02
○ 2017-05-15 14:35:54
○ 2026-07-18 20:20:32

●A13.223.25.842026-03-17 → 2026-07-18 · 3 obs

○ 2017-05-15 14:35:54
● 2026-03-17 09:18:30
● 2026-07-18 20:20:32

●A2600:1f18:4ae:c605:dd5d:b838:5816:d7fb2026-03-17 → 2026-07-18 · 3 obs

○ 2017-05-15 14:35:54
● 2026-03-17 09:18:30
● 2026-07-18 20:20:32

●A2600:1f18:4ae:c606:78d4:4260:db4e:aeee2026-03-17 → 2026-07-18 · 3 obs

○ 2017-05-15 14:35:54
● 2026-03-17 09:18:30
● 2026-07-18 20:20:32

○A52.204.129.222017-05-15 → 2017-05-15 · 4 obs

○ 2016-10-02 08:04:02
● 2017-05-15 14:35:54
○ 2026-03-17 09:18:30
○ 2026-07-18 20:20:32

○A52.206.43.2342016-10-02 → 2016-10-02 · 4 obs

○ 2016-03-18 05:28:22
● 2016-10-02 08:04:02
○ 2017-05-15 14:35:54
○ 2026-07-18 20:20:32

○A52.21.180.2332016-03-18 → 2016-03-18 · 4 obs

○ 2015-12-17 02:37:04
● 2016-03-18 05:28:22
○ 2016-10-02 08:04:02
○ 2026-07-18 20:20:32

○A52.3.120.902016-03-18 → 2016-03-18 · 4 obs

○ 2015-12-17 02:37:04
● 2016-03-18 05:28:22
○ 2016-10-02 08:04:02
○ 2026-07-18 20:20:32

○A52.4.72.1372016-10-02 → 2016-10-02 · 4 obs

○ 2016-03-18 05:28:22
● 2016-10-02 08:04:02
○ 2017-05-15 14:35:54
○ 2026-07-18 20:20:32

○A54.174.31.2542015-08-20 → 2015-08-20 · 3 obs

● 2015-08-20 23:03:18
○ 2017-05-15 14:35:54
○ 2026-07-18 20:20:32

○A54.208.74.2152015-08-20 → 2015-08-20 · 3 obs

● 2015-08-20 23:03:18
○ 2017-05-15 14:35:54
○ 2026-07-18 20:20:32

○A54.209.90.812015-12-17 → 2015-12-17 · 4 obs

○ 2015-08-20 23:03:18
● 2015-12-17 02:37:04
○ 2016-03-18 05:28:22
○ 2026-07-18 20:20:32

○A54.210.33.1902016-10-02 → 2016-10-02 · 4 obs

○ 2016-03-18 05:28:22
● 2016-10-02 08:04:02
○ 2017-05-15 14:35:54
○ 2026-07-18 20:20:32

○A54.236.123.2242016-10-02 → 2016-10-02 · 4 obs

○ 2016-03-18 05:28:22
● 2016-10-02 08:04:02
○ 2017-05-15 14:35:54
○ 2026-07-18 20:20:32

●A54.243.117.1972026-03-17 → 2026-07-18 · 3 obs

○ 2017-05-15 14:35:54
● 2026-03-17 09:18:30
● 2026-07-18 20:20:32

○A54.85.127.702017-05-15 → 2017-05-15 · 4 obs

○ 2016-10-02 08:04:02
● 2017-05-15 14:35:54
○ 2026-03-17 09:18:30
○ 2026-07-18 20:20:32

○CNAMEhdredirect-lb-399551664.us-east-1.elb.amazonaws.com2015-08-20 → 2016-10-02 · 5 obs

○ 2008-03-17 11:32:44
● 2015-08-20 23:03:18
● 2016-10-02 08:04:02
○ 2017-05-15 14:35:54
○ 2026-07-18 20:20:32

○CNAMEhdredirect-lb3-890977680.us-east-1.elb.amazonaws.com2017-05-15 → 2017-05-15 · 4 obs

○ 2016-10-02 08:04:02
● 2017-05-15 14:35:54
○ 2026-03-17 09:18:30
○ 2026-07-18 20:20:32

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	e.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, j.gtld-servers.net...	-
precourse.com	nsg1.namebrightdns.com, nsg2.namebrightdns.com	12 records

✅ Authoritative Response

Server:3.90.140.102

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for precourse.com (unsigned zone)

⏱️ Timing

Total: 821ms | 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	`afternic-verification-G9G3tM8T8EwEizzPzj, v=spf1 -all`
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

precourse.com has 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.

Two other host names, along with bevertical.com, unixcoders.com and lukima.com, also share IP numbers with precourse.com.

Name Servers

precourse.com has three name servers — ns1.namebrightdns.com, nsg1.namebrightdns.com and nsg2.namebrightdns.com.

precourse.com has at least partial name server overlap with other domains, such as traumatv.com, aaa.krkrkr.com, atomhub.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.

DNS names with 6 IP addresses:

nsg1.namebrightdns.com points to 54.80.151.113, 54.89.201.236, 54.234.103.190 and 3 other IP addresses.

nsg2.namebrightdns.com points to 3.90.140.102, 54.221.37.2, 54.225.31.228 and 3 other IP addresses.

Host names directing to five IP addresses:

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