linuxcourse.com - dns.ninja

`linuxcourse.com`

DNSSEC	⚠️ Not signed
A	3.97.59.255^{🇨🇦 Amazon3.96.0.0/15 EC2 YUL prefix}
		PTR	`ec2-3-97-59-255.ca-central-1.compute.amazonaws.com`
A	16.54.163.115^{🇺🇸 Amazon16.54.0.0/15 EC2 YUL prefix}
NS	`ip-172-26-1-146.us-east-2.compute.internal` ⭐
NS	`ns1.power-dns.com`
		A	13.58.50.225^{🇺🇸 Amazon13.58.0.0/15 EC2 CMH prefix}
			PTR	`ec2-13-58-50-225.us-east-2.compute.amazonaws.com`
NS	`ns2.power-dns.com`
		A	188.166.142.159^{🇳🇱 DIGITALOCEAN188.166.140.0/22 DigitalOcean}
NS	`ns3.power-dns.com`
		A	139.59.220.175^{🇸🇬 DIGITALOCEAN139.59.220.0/22 DigitalOcean}
MX	`mx1.ewebdevelopment.com` ⭐
		A	159.203.54.48^{🇨🇦 DIGITALOCEAN159.203.52.0/22 DigitalOcean}
MX	`mx2.ewebdevelopment.com`⁽⁵⁾
		A	188.166.142.73^{🇳🇱 DIGITALOCEAN188.166.140.0/22 DigitalOcean}
TXT	`934c3bfaa10e7d053ed251a82e3f4a82d19da885`
TXT	`afternic-verification-VKoxaZkQawZ8VVht35n43c`
TXT	`v=spf1 include:u2069692.wl.sendgrid.net -all`
TXT	`91f786e2661531d62a5e4bf8dc941c30c7391ed6`
SOA	`ip-172-26-1-146.us-east-2.compute.internal`hostmaster@power-dns.com 2025-01-15 #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=1781862870

Subdomains

nullmx.linuxcourse.com

Same first word

linuxcourse.nl

linuxcourse.com

Similar names

unisourcexl.net

linuxsource.com

linuxsource.de

sourcelinux.com

unisourcexl.com

linuxsource.nl

DNS History

26 records (8 active, 18 former)

○NSamsterdam.power-dns.com2020-01-09 → 2020-01-09 · 4 obs

○ 2016-02-12 08:11:12
● 2020-01-09 20:28:58
○ 2026-03-19 04:34:56
○ 2026-06-19 10:23:54

●NSip-172-26-1-146.us-east-2.compute.internal2026-03-19 → 2026-06-19 · 6 obs

○ 2020-01-09 20:28:58
● 2026-03-19 04:34:56
● 2026-04-04 08:27:38
○ 2026-05-13 21:41:36
● 2026-05-13 23:35:08
● 2026-06-19 10:23:54

○NSns1.hitfarm.com2008-03-20 → 2008-03-20 · 3 obs

● 2008-03-20 10:52:56
○ 2015-07-15 04:31:36
○ 2026-06-19 10:23:54

●NSns1.power-dns.com2015-07-15 → 2026-06-19 · 5 obs

○ 2008-03-20 10:52:56
● 2015-07-15 04:31:36
○ 2015-11-20 07:09:00
● 2016-02-12 08:11:12
● 2026-06-19 10:23:54

○NSns2.hitfarm.com2008-03-20 → 2008-03-20 · 3 obs

● 2008-03-20 10:52:56
○ 2015-07-15 04:31:36
○ 2026-06-19 10:23:54

●NSns2.power-dns.com2015-07-15 → 2026-06-19 · 6 obs

○ 2008-03-20 10:52:56
● 2015-07-15 04:31:36
● 2015-11-20 07:09:00
○ 2016-02-12 08:11:12
● 2020-01-09 20:28:58
● 2026-06-19 10:23:54

○NSns3.hitfarm.com2008-03-20 → 2008-03-20 · 3 obs

● 2008-03-20 10:52:56
○ 2015-07-15 04:31:36
○ 2026-06-19 10:23:54

●NSns3.power-dns.com2020-01-09 → 2026-06-19 · 3 obs

○ 2016-02-12 08:11:12
● 2020-01-09 20:28:58
● 2026-06-19 10:23:54

○NSsingapore.power-dns.com2026-05-13 → 2026-05-13 · 4 obs

○ 2026-04-04 08:27:38
● 2026-05-13 21:41:36
○ 2026-05-13 23:35:08
○ 2026-06-19 10:23:54

○MXmail.dovemail.com2015-07-15 → 2017-01-29 · 5 obs

○ 2008-03-20 10:52:56
● 2015-07-15 04:31:36
● 2017-01-29 13:17:00
○ 2020-01-09 20:28:58
○ 2026-06-19 10:23:54

●MXmx1.ewebdevelopment.com2020-01-09 → 2026-06-19 · 3 obs

○ 2017-01-29 13:17:00
● 2020-01-09 20:28:58
● 2026-06-19 10:23:54

●MXmx2.ewebdevelopment.com2020-01-09 → 2026-06-19 · 3 obs

○ 2017-01-29 13:17:00
● 2020-01-09 20:28:58
● 2026-06-19 10:23:54

○MXnullmx.linuxcourse.com2008-03-20 → 2008-03-20 · 3 obs

● 2008-03-20 10:52:56
○ 2015-07-15 04:31:36
○ 2026-06-19 10:23:54

○A15.157.197.2332026-05-13 → 2026-05-13 · 4 obs

○ 2026-04-04 08:27:38
● 2026-05-13 21:41:36
● 2026-05-13 23:35:08
○ 2026-06-19 10:23:54

○A16.52.102.942026-03-19 → 2026-03-19 · 4 obs

○ 2020-01-09 20:28:58
● 2026-03-19 04:34:56
○ 2026-04-04 08:27:38
○ 2026-06-19 10:23:54

○A16.52.206.1002026-03-19 → 2026-03-19 · 4 obs

○ 2020-01-09 20:28:58
● 2026-03-19 04:34:56
○ 2026-04-04 08:27:38
○ 2026-06-19 10:23:54

○A16.52.221.262026-05-13 → 2026-05-13 · 4 obs

○ 2026-04-04 08:27:38
● 2026-05-13 21:41:36
● 2026-05-13 23:35:08
○ 2026-06-19 10:23:54

●A16.54.163.1152026-06-19 → 2026-06-19 · 2 obs

○ 2026-05-13 23:35:08
● 2026-06-19 10:23:54

○A16.54.19.742026-04-04 → 2026-04-04 · 4 obs

○ 2026-03-19 04:34:56
● 2026-04-04 08:27:38
○ 2026-05-13 21:41:36
○ 2026-06-19 10:23:54

○A16.54.9.1192026-04-04 → 2026-04-04 · 4 obs

○ 2026-03-19 04:34:56
● 2026-04-04 08:27:38
○ 2026-05-13 21:41:36
○ 2026-06-19 10:23:54

○A174.36.107.1302015-07-15 → 2017-01-29 · 5 obs

○ 2008-03-20 10:52:56
● 2015-07-15 04:31:36
● 2017-01-29 13:17:00
○ 2020-01-09 20:28:58
○ 2026-06-19 10:23:54

○A174.37.172.1622015-07-15 → 2015-07-15 · 4 obs

○ 2008-03-20 10:52:56
● 2015-07-15 04:31:36
○ 2026-03-19 04:34:56
○ 2026-06-19 10:23:54

○A217.68.70.692008-03-20 → 2008-03-20 · 3 obs

● 2008-03-20 10:52:56
○ 2015-07-15 04:31:36
○ 2026-06-19 10:23:54

●A3.97.59.2552026-06-19 → 2026-06-19 · 2 obs

○ 2026-05-13 23:35:08
● 2026-06-19 10:23:54

○A52.60.233.32020-01-09 → 2020-01-09 · 4 obs

○ 2017-01-29 13:17:00
● 2020-01-09 20:28:58
○ 2026-03-19 04:34:56
○ 2026-06-19 10:23:54

○A99.79.96.1082020-01-09 → 2020-01-09 · 4 obs

○ 2017-01-29 13:17:00
● 2020-01-09 20:28:58
○ 2026-03-19 04:34:56
○ 2026-06-19 10:23:54

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	l.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net...	-
linuxcourse.com	ns1.power-dns.com, ns2.power-dns.com, ns3.power-dns.com	3 records

✅ Authoritative Response

Server:13.58.50.225

NS records: ns1.power-dns.com, ns2.power-dns.com, ns3.power-dns.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for linuxcourse.com (unsigned zone)

⏱️ Timing

Total: 525ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`16.54.163.115, 3.97.59.255`
NS	3	`ns2.power-dns.com, ns1.power-dns.com...`
MX	2	`mx1.ewebdevelopment.com (pri: 1), mx2.ewebdevelopment.com (pri: 5)`
TXT	4	`934c3bfaa10e7d053ed251a82e3f4a82d19da885, afternic-verification-VKoxaZkQawZ8VVht35...`
SOA	1	`ip-172-26-1-146.us-east-2.compute.intern`

📌 Glue Records Collected

Total: 3

Out-of-bailiwick: 3 (ns1.power-dns.com, ns2.power-dns.com, ns3.power-dns.com)

Analysis

Hierarchy

linuxcourse.com is a parent domain of nullmx.linuxcourse.com.

IP Addresses

linuxcourse.com resolves to the IP addresses 3.97.59.255 and 16.54.163.115

finipa.com, daystorm.com, oldup.com plus two other host names have IP numbers in common with linuxcourse.com.

Name Servers

Four name servers handle the delegation for linuxcourse.com: ns1.power-dns.com, ns2.power-dns.com, ns3.power-dns.com and ip-172-26-1-146.us-east-2.compute.internal.

linuxcourse.com shares at least some of its name servers with other domains, including explain-it.com, africanitems.com, pkwe.com and two others.

These name servers are frequently paired with the name servers singapore.power-dns.com and amsterdam.power-dns.com.

Each of the three hostnames points to exactly one IP address: ns1.power-dns.com points to 13.58.50.225, ns2.power-dns.com points to 188.166.142.159 and ns3.power-dns.com points to 139.59.220.175.

Mail Servers

linuxcourse.com uses two mail servers, mx1.ewebdevelopment.com and mx2.ewebdevelopment.com.

The mail server setup of linuxcourse.com matches that of other domains such as hasdia.com, tasana.com, wocia.com and two others.

mx1.ewebdevelopment.com and mx2.ewebdevelopment.com each resolve to one IP number: mx1.ewebdevelopment.com points to 159.203.54.48 and mx2.ewebdevelopment.com points to 188.166.142.73.