`linuxcourseware.com`

DNSSEC	⚠️ Not signed
A	50.115.18.84^{🇺🇸 AS5386150.115.16.0/21 KGIX}
		PTR	`84-18-115-50.tpa.kgix.net`
NS	`ns1.kualo.net` ⭐
		A	50.115.18.250^{🇺🇸 AS5386150.115.16.0/21 KGIX}
			PTR	`ns1.kualo.net`
NS	`ns2.kualo.net`
		A	2400:cb00:2049:1::a29f:1822^{🇺🇸 Cloudflare2400:cb00:2049::/48 , Inc. 101 Townsend Street}
			PTR	`ns2.kualo.net`
		A	162.159.24.34^{Cloudflare162.159.24.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`ns2.kualo.net`
NS	`ns3.kualo.net`
		A	2400:cb00:2049:1::a29f:19f7^{🇺🇸 Cloudflare2400:cb00:2049::/48 , Inc. 101 Townsend Street}
			PTR	`ns3.kualo.net`
		A	162.159.25.247^{Cloudflare162.159.25.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`ns3.kualo.net`
NS	`ns4.kualo.net`
		A	2400:cb00:2049:1::a29f:1a99^{🇺🇸 Cloudflare2400:cb00:2049::/48 , Inc. 101 Townsend Street}
			PTR	`ns4.kualo.net`
		A	162.159.26.153^{Cloudflare162.159.26.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`ns4.kualo.net`
MX	`linuxcourseware.com` ⭐
		A	50.115.18.84^{🇺🇸 AS5386150.115.16.0/21 KGIX}
			PTR	`84-18-115-50.tpa.kgix.net`
TXT	`google-site-verification=B4IwzftMcfE4Jkcj5R-ERPYli7ONl_LiEG1f_hajZdE +ip4:75....`
TXT	`v=spf1 ip4:50.115.18.80 include:spf.filteredmx.net +a +mx a mx include:relay....`
TXT	`mailerlite-domain-verification=52c5a228aa84da61c9207960dc39b99368469bcf`
TXT	`google-site-verification=0xQMxcPkUHZvw3DrwmmvLl2I-UQg3lMAg-mSgL6NJ-A +ip4:75....`
SOA	`ns1.kualo.net`server_alerts_inbound@kgix.com 2026-03-06 #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=1771291435

MX for

linuxcourseware.com

Subdomains

coursefiles.linuxcourseware.com

Same first word

linuxcourseware.com

DNS History

16 records (6 active, 10 former)

○NSns.inmotionhosting.com2015-06-08 → 2016-09-08 · 4 obs

● 2015-06-08 11:38:02
● 2016-09-08 18:29:08
○ 2017-04-04 18:30:00
○ 2026-03-06 04:17:06

○NSns1.a2hosting.com2017-04-04 → 2017-04-04 · 4 obs

○ 2016-09-08 18:29:08
● 2017-04-04 18:30:00
○ 2026-03-05 21:25:40
○ 2026-03-06 04:17:06

○NSns1.inmotionhosting.com2026-03-05 → 2026-03-06 · 2 obs

○ 2026-03-05 21:25:40
○ 2026-03-06 04:17:06

●NSns1.kualo.net2026-03-05 → 2026-03-06 · 3 obs

○ 2017-04-04 18:30:00
● 2026-03-05 21:25:40
● 2026-03-06 04:17:06

○NSns2.a2hosting.com2017-04-04 → 2017-04-04 · 4 obs

○ 2016-09-08 18:29:08
● 2017-04-04 18:30:00
○ 2026-03-05 21:25:40
○ 2026-03-06 04:17:06

○NSns2.inmotionhosting.com2015-06-08 → 2016-09-08 · 4 obs

● 2015-06-08 11:38:02
● 2016-09-08 18:29:08
○ 2017-04-04 18:30:00
○ 2026-03-06 04:17:06

●NSns2.kualo.net2026-03-05 → 2026-03-06 · 3 obs

○ 2017-04-04 18:30:00
● 2026-03-05 21:25:40
● 2026-03-06 04:17:06

○NSns3.a2hosting.com2017-04-04 → 2017-04-04 · 4 obs

○ 2016-09-08 18:29:08
● 2017-04-04 18:30:00
○ 2026-03-05 21:25:40
○ 2026-03-06 04:17:06

●NSns3.kualo.net2026-03-05 → 2026-03-06 · 3 obs

○ 2017-04-04 18:30:00
● 2026-03-05 21:25:40
● 2026-03-06 04:17:06

○NSns4.a2hosting.com2017-04-04 → 2017-04-04 · 4 obs

○ 2016-09-08 18:29:08
● 2017-04-04 18:30:00
○ 2026-03-05 21:25:40
○ 2026-03-06 04:17:06

●NSns4.kualo.net2026-03-05 → 2026-03-06 · 3 obs

○ 2017-04-04 18:30:00
● 2026-03-05 21:25:40
● 2026-03-06 04:17:06

●MXlinuxcourseware.com2015-06-08 → 2026-03-06 · 2 obs

● 2015-06-08 11:38:02
● 2026-03-06 04:17:06

○A209.182.196.262026-03-05 → 2026-03-06 · 2 obs

○ 2026-03-05 21:25:40
○ 2026-03-06 04:17:06

●A50.115.18.842026-03-05 → 2026-03-06 · 3 obs

○ 2017-04-04 18:30:00
● 2026-03-05 21:25:40
● 2026-03-06 04:17:06

○A66.198.240.332017-04-04 → 2017-04-04 · 4 obs

○ 2016-09-08 18:29:08
● 2017-04-04 18:30:00
○ 2026-03-05 21:25:40
○ 2026-03-06 04:17:06

○A70.39.233.1762015-06-08 → 2016-09-08 · 4 obs

● 2015-06-08 11:38:02
● 2016-09-08 18:29:08
○ 2017-04-04 18:30:00
○ 2026-03-06 04:17:06

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
linuxcourseware.com	ns1.kualo.net, ns2.kualo.net, ns3.kualo.net, ns4.kualo.net	-

✅ Authoritative Response

Server: 162.159.25.247

NS records: ns1.kualo.net, ns2.kualo.net, ns3.kualo.net, ns4.kualo.net

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for linuxcourseware.com (unsigned zone)

⏱️ Timing

Total: 1014ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`50.115.18.84`
NS	4	`ns2.kualo.net, ns3.kualo.net...`
MX	1	`linuxcourseware.com (pri: 0)`
TXT	4	`google-site-verification=B4IwzftMcfE4Jkc, v=spf1 ip4:50.115.18.80 include:spf.filt...`
SOA	1	`ns1.kualo.net server_alerts_inbound.kgix`

Analysis

Hierarchy

The parent of coursefiles.linuxcourseware.com is linuxcourseware.com.

Mail Server Role

linuxcourseware.com serves as the mail server for linuxcourseware.com.

IP Addresses

linuxcourseware.com points to IP number: 50.115.18.84.

Other host names such as brunohenry.com, 84-18-115-50.tpa.kgix.net, pwwr.net, castirondrainageproducts.com and joinex.org share IPs with linuxcourseware.com.

Name Servers

linuxcourseware.com is delegated to four name servers: ns1.kualo.net, ns2.kualo.net, ns3.kualo.net and ns4.kualo.net.

linuxcourseware.com at least partially shares name servers with other domains, for instance the-mcconnells.co.uk, scottishsupporters.net, passagesmidwifery.com, lancastermediations.com and alignequitygroup.com.

Two IPs per host:

ns2.kualo.net points to 2400:cb00:2049:1::a29f:1822 and 162.159.24.34

ns3.kualo.net points to 2400:cb00:2049:1::a29f:19f7 and 162.159.25.247

ns4.kualo.net points to 2400:cb00:2049:1::a29f:1a99 and 162.159.26.153

One IP per host:

ns1.kualo.net points to 50.115.18.250

Mail Servers

linuxcourseware.com is handled by a single mail server, linuxcourseware.com.

linuxcourseware.com points to a single IP: 50.115.18.84.

linuxcourseware.com - robtex.com