course1.com - dns.ninja

`course1.com`

DNSSEC	⚠️ Not signed
A	198.54.126.4^{🇺🇸 NAMCHEAP-PH198.54.126.0/24}
		PTR	`host55-2.registrar-servers.com`
NS	`rs55a.registrar-servers.com` ⭐
		A	198.54.126.2^{🇺🇸 NAMCHEAP-PH198.54.126.0/24}
			PTR	`host55.registrar-servers.com`
NS	`rs55b.registrar-servers.com`
		A	198.54.126.3^{🇺🇸 NAMCHEAP-PH198.54.126.0/24}
			PTR	`host55-1.registrar-servers.com`
MX	`course1-com.mail.protection.outlook.com` ⭐
		A	2a01:111:f403:c902::^{🇺🇸 Microsoft2a01:111:f000::/36}
			PTR	`mail-sj2pr05cu00300.inbound.protection.outlook.com`
		A	2a01:111:f403:c902::3^{🇺🇸 Microsoft2a01:111:f000::/36}
			PTR	`mail-sj0pr03cu01703.inbound.protection.outlook.com`
		A	2a01:111:f403:f802::1^{🇺🇸 Microsoft2a01:111:f000::/36}
			PTR	`mail-sj2pr05cu00101.inbound.protection.outlook.com`
		A	2a01:111:f403:f913::^{🇺🇸 Microsoft2a01:111:f000::/36}
			PTR	`mail-cy1pr03cu00100.inbound.protection.outlook.com`
		A	52.101.9.14^{🇺🇸 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-bl0pr03cu00206.inbound.protection.outlook.com`
		A	52.101.10.1^{🇺🇸 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-bn6pr02cu00301.inbound.protection.outlook.com`
		A	52.101.10.6^{🇺🇸 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-bn1pr21cu00106.inbound.protection.outlook.com`
		A	52.101.194.19^{🇺🇸 Microsoft52.96.0.0/12 MICROSOFT}
			PTR	`mail-ch5pr02cu00303.inbound.protection.outlook.com`
TXT	`v=spf1 include:spf.protection.outlook.com ~all`
SOA	`rs55a.registrar-servers.com`softoltd@gmail.com 2026-05-07 #23

`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=1782284850

rank #373098 globally
rank #160355 in the tld

Same first word

course1.s3.amazonaws.com

course1.com

Similar names

source1.events

1source.mx

source1.ca

1source.ai

1source.solutions

1source.online

source1.org

source1.net

1source.ph

1source.fitness

source1.parts

1source.ca

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1source.org

source1.de

1source.com.my

source1.in

source1.se

1source.co.za

1source.co.uk

oursec1.com

1course.com

source1.com

1source.com.sg

1source.global

1course.ru

1source.ru

1source.com

1source.org.au

1source.in

1course.cn

source1.eu

source1.no

1source.ch

1source.net

DNS History

20 records (4 active, 16 former)

○NSdns1.name-services.com2016-05-06 → 2017-02-09 · 4 obs

● 2016-05-06 16:56:52
● 2017-02-09 02:18:44
○ 2020-02-29 07:12:52
○ 2026-06-24 07:29:22

○NSdns1.namecheaphosting.com2026-04-08 → 2026-04-13 · 5 obs

○ 2026-03-08 11:04:58
● 2026-04-08 14:15:28
● 2026-04-13 16:11:20
○ 2026-04-28 12:38:40
○ 2026-06-24 07:29:22

○NSdns2.name-services.com2016-05-06 → 2017-02-09 · 4 obs

● 2016-05-06 16:56:52
● 2017-02-09 02:18:44
○ 2020-02-29 07:12:52
○ 2026-06-24 07:29:22

○NSdns2.namecheaphosting.com2026-04-08 → 2026-04-13 · 5 obs

○ 2026-03-08 11:04:58
● 2026-04-08 14:15:28
● 2026-04-13 16:11:20
○ 2026-04-28 12:38:40
○ 2026-06-24 07:29:22

○NSdns3.name-services.com2016-05-06 → 2017-02-09 · 4 obs

● 2016-05-06 16:56:52
● 2017-02-09 02:18:44
○ 2020-02-29 07:12:52
○ 2026-06-24 07:29:22

○NSdns4.name-services.com2016-05-06 → 2017-02-09 · 4 obs

● 2016-05-06 16:56:52
● 2017-02-09 02:18:44
○ 2020-02-29 07:12:52
○ 2026-06-24 07:29:22

○NSdns5.name-services.com2016-05-06 → 2017-02-09 · 4 obs

● 2016-05-06 16:56:52
● 2017-02-09 02:18:44
○ 2020-02-29 07:12:52
○ 2026-06-24 07:29:22

○NSns0.thundercloud.uk2026-02-26 → 2026-03-08 · 5 obs

○ 2021-05-28 11:42:50
● 2026-02-26 13:07:38
● 2026-03-08 11:04:58
○ 2026-04-08 14:15:28
○ 2026-06-24 07:29:22

○NSns1.thundercloud.uk2026-02-26 → 2026-03-08 · 5 obs

○ 2021-05-28 11:42:50
● 2026-02-26 13:07:38
● 2026-03-08 11:04:58
○ 2026-04-08 14:15:28
○ 2026-06-24 07:29:22

○NSns69.domaincontrol.com2020-02-29 → 2021-05-28 · 5 obs

○ 2017-02-09 02:18:44
● 2020-02-29 07:12:52
● 2021-05-28 11:42:50
○ 2026-02-26 13:07:38
○ 2026-06-24 07:29:22

○NSns70.domaincontrol.com2020-02-29 → 2021-05-28 · 5 obs

○ 2017-02-09 02:18:44
● 2020-02-29 07:12:52
● 2021-05-28 11:42:50
○ 2026-02-26 13:07:38
○ 2026-06-24 07:29:22

●NSrs55a.registrar-servers.com2026-04-28 → 2026-06-24 · 3 obs

○ 2026-04-13 16:11:20
● 2026-04-28 12:38:40
● 2026-06-24 07:29:22

●NSrs55b.registrar-servers.com2026-04-28 → 2026-06-24 · 3 obs

○ 2026-04-13 16:11:20
● 2026-04-28 12:38:40
● 2026-06-24 07:29:22

●MXcourse1-com.mail.protection.outlook.com2020-02-29 → 2026-06-24 · 2 obs

● 2020-02-29 07:12:52
● 2026-06-24 07:29:22

○A149.255.62.1612026-02-26 → 2026-03-08 · 5 obs

○ 2021-05-28 11:42:50
● 2026-02-26 13:07:38
● 2026-03-08 11:04:58
○ 2026-04-08 14:15:28
○ 2026-06-24 07:29:22

●A198.54.126.42026-04-28 → 2026-06-24 · 3 obs

○ 2026-04-13 16:11:20
● 2026-04-28 12:38:40
● 2026-06-24 07:29:22

○A35.185.17.712020-02-29 → 2021-05-28 · 5 obs

○ 2017-02-09 02:18:44
● 2020-02-29 07:12:52
● 2021-05-28 11:42:50
○ 2026-02-26 13:07:38
○ 2026-06-24 07:29:22

○A68.65.123.2492026-04-08 → 2026-04-13 · 5 obs

○ 2026-03-08 11:04:58
● 2026-04-08 14:15:28
● 2026-04-13 16:11:20
○ 2026-04-28 12:38:40
○ 2026-06-24 07:29:22

○A69.64.147.2432017-02-09 → 2017-02-09 · 4 obs

○ 2016-05-06 16:56:52
● 2017-02-09 02:18:44
○ 2020-02-29 07:12:52
○ 2026-06-24 07:29:22

○A8.5.1.442016-05-06 → 2016-05-06 · 3 obs

● 2016-05-06 16:56:52
○ 2017-02-09 02:18:44
○ 2026-06-24 07:29:22

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
course1.com	rs55a.registrar-servers.com, rs55b.registrar-servers.com	2 records

✅ Authoritative Response

Server:198.54.126.3

NS records: rs55a.registrar-servers.com, rs55b.registrar-servers.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for course1.com (unsigned zone)

⏱️ Timing

Total: 336ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`198.54.126.4`
NS	2	`rs55a.registrar-servers.com, rs55b.registrar-servers.com`
MX	1	`course1-com.mail.protection.outlook.com`
TXT	1	`v=spf1 include:spf.protection.outlook.co`
SOA	1	`rs55a.registrar-servers.com softoltd.gma`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (rs55a.registrar-servers.com, rs55b.registrar-servers.com)

Analysis

IP Addresses

course1.com has exactly one IP address — 198.54.126.4.

mail.w9dba.com, _dc-mx.4158d050a3d1.niagahoster.my.id, defensivedriversgroup.com plus two other host names have IP numbers in common with course1.com.

Name Servers

course1.com is delegated to two name servers: rs55a.registrar-servers.com and rs55b.registrar-servers.com.

The name server configuration of course1.com is shared with other domains, for instance ppssys.com, nalpb.com, tanco.us and two others.

The name servers of course1.com overlap at least partially with those of other domains — among them cajecreative.com, apexnepal.com.np, eximfreightbd.com and two more.

These name servers commonly appear in delegations together with ns1.radiatnserversite.com, ns2.radiatnserversite.com, rs109.registrar-servers.com and 7 other.

Both rs55a.registrar-servers.com and rs55b.registrar-servers.com have a single IP address each — rs55a.registrar-servers.com resolves to 198.54.126.2 while rs55b.registrar-servers.com resolves to 198.54.126.3.

Mail Servers

course1.com uses one mail server — course1-com.mail.protection.outlook.com.

course1-com.mail.protection.outlook.com has 8 IP addresses: 52.101.9.14, 52.101.10.1, 52.101.10.6 plus 5 more.