`coursefiles.linuxcourseware.com`

CNAME	`coursefiles.linuxcourseware.com.s3.us-east-2.amazonaws.com`
CNAME	`s3-r-w.us-east-2.amazonaws.com`
DNSSEC	⚠️ Not signed
A	3.5.88.50^{Amazon3.5.88.0/24}
A	3.5.92.123^{Amazon3.5.92.0/24 AWS S3}
A	3.5.129.40^{Amazon3.5.129.0/24}
A	3.5.129.42^{Amazon3.5.129.0/24}
A	3.5.131.13^{Amazon3.5.131.0/24}
A	52.219.94.170^{Amazon52.219.92.0/22}
A	52.219.102.82^{Amazon52.219.102.0/24}
A	52.219.106.226^{Amazon52.219.106.0/24}
NS	`ns-90.awsdns-11.com` ⭐
		A	2600:9000:5300:5a00::1^{🇺🇸 Amazon2600:9000:5300::/48 - CloudFront}
			PTR	`ns-90.awsdns-11.com`
		A	205.251.192.90^{🇺🇸 Amazon205.251.192.0/24 prefix}
			PTR	`ns-90.awsdns-11.com`
NS	`ns-1009.awsdns-62.net`
		A	2600:9000:5303:f100::1^{🇺🇸 Amazon2600:9000:5303::/48 - CloudFront}
			PTR	`ns-1009.awsdns-62.net`
		A	205.251.195.241^{🇺🇸 Amazon205.251.195.0/24 prefix}
			PTR	`ns-1009.awsdns-62.net`
NS	`ns-1428.awsdns-50.org`
		A	2600:9000:5305:9400::1^{🇺🇸 Amazon2600:9000:5305::/48 - CloudFront}
			PTR	`ns-1428.awsdns-50.org`
		A	205.251.197.148^{🇺🇸 Amazon205.251.197.0/24 prefix}
			PTR	`ns-1428.awsdns-50.org`
NS	`ns-1974.awsdns-54.co.uk`
		A	2600:9000:5307:b600::1^{🇺🇸 Amazon2600:9000:5307::/48 - CloudFront}
			PTR	`ns-1974.awsdns-54.co.uk`
		A	205.251.199.182^{🇺🇸 Amazon205.251.199.0/24 prefix}
			PTR	`ns-1974.awsdns-54.co.uk`
TXT	`ec885c714863bb56f6d00b64275f2784`
SOA	`ns-90.awsdns-11.com`awsdns-hostmaster@amazon.com serial=1

`linuxcourseware.com`

	DNSSEC	⚠️ Not signed
	A	50.115.18.84^{🇺🇸 AS5386150.115.16.0/21 KGIX}
	NS	`ns1.kualo.net` ⭐
	NS	`ns2.kualo.net`
	NS	`ns3.kualo.net`
	NS	`ns4.kualo.net`
	MX	`linuxcourseware.com` ⭐
	TXT	`google-site-verification=0xQMxcPkUHZvw3DrwmmvLl2I-UQg3lMAg-mSgL6NJ-A +ip4:75....`
	TXT	`mailerlite-domain-verification=52c5a228aa84da61c9207960dc39b99368469bcf`
	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....`
	SOA	`ns1.kualo.net`server_alerts_inbound@kgix.com 2026-03-06 #1

Similar names

sourcefiles.org

lifecourses.eu

DNS History

1 record (1 active, 0 former)

●CNAMEcoursefiles.linuxcourseware.com.s3.us-east-2.amazonaws.com2026-03-05 → 2026-03-09 · 2 obs

● 2026-03-05 21:25:38
● 2026-03-09 09:28:22

🔍 DNS Trace

📋 Delegation Chain

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

✅ Authoritative Response

Server: 50.115.18.250

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: 783ms | Queries: -

📄 Records

Type	Count	Sample Data
CNAME	1	`coursefiles.linuxcourseware.com.s3.us-ea`

Analysis

IP Addresses

coursefiles.linuxcourseware.com maps to eight IPs: 3.5.88.50, 3.5.92.123, 3.5.129.40, 3.5.129.42, 3.5.131.13, 52.219.94.170, 52.219.102.82 and 52.219.106.226.

Name Servers

coursefiles.linuxcourseware.com is delegated to four name servers: ns-90.awsdns-11.com, ns-1009.awsdns-62.net, ns-1428.awsdns-50.org and ns-1974.awsdns-54.co.uk.

coursefiles.linuxcourseware.com shares name servers with other domains at least partially, for instance inviami.com, mckeown.dev, 192.132.212.in-addr.arpa, web.maine.gov and s2holding.com.br.

Host names with two IP numbers:

ns-90.awsdns-11.com resolves to 2600:9000:5300:5a00::1 and 205.251.192.90.

ns-1009.awsdns-62.net resolves to 2600:9000:5303:f100::1 and 205.251.195.241.

ns-1428.awsdns-50.org resolves to 2600:9000:5305:9400::1 and 205.251.197.148.

ns-1974.awsdns-54.co.uk resolves to 2600:9000:5307:b600::1 and 205.251.199.182.

coursefiles.linuxcourseware.com - robtex.com

coursefiles.linuxcourseware.com

linuxcourseware.com