🛡️Domain Reputation CheckBlocklist, phishing & malware status→

`linuxmastering.com`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::6815:3af3^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3030::ac43:a648^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.58.243^{Cloudflare104.21.48.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.166.72^{🇺🇸 Cloudflare172.67.160.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`anton.ns.cloudflare.com` ⭐
		A	2606:4700:58::a29f:2caf^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`anton.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c3af^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`anton.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:23af^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`anton.ns.cloudflare.com`
		A	108.162.195.175^{🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`anton.ns.cloudflare.com`
		A	162.159.44.175^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`anton.ns.cloudflare.com`
		A	172.64.35.175^{🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`anton.ns.cloudflare.com`
NS	`harlee.ns.cloudflare.com`
		A	2606:4700:50::a29f:26ee^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`harlee.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c2ee^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`harlee.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:22ee^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`harlee.ns.cloudflare.com`
		A	108.162.194.238^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`harlee.ns.cloudflare.com`
		A	162.159.38.238^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`harlee.ns.cloudflare.com`
		A	172.64.34.238^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`harlee.ns.cloudflare.com`
MX	`mx1.privateemail.com` ⭐
		A	162.255.118.7^{🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES}
			PTR	`mx1.privateemail.com`
MX	`mx2.privateemail.com`⁽¹⁰⁾
		A	162.255.118.8^{🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES}
			PTR	`mx2.privateemail.com`
TXT	`v=spf1 include:spf.privateemail.com ~all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.58.243, 172.67.166.72
		IPv6 hints	2606:4700:3030::6815:3af3, 2606:4700:3030::ac43:a648
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=113, name=cloudflare-ech.com
SOA	`anton.ns.cloudflare.com`dns@cloudflare.com serial=2411383326

`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=1788511955

Same first word

linuxmastering.com

Similar names

masteringlinux.com

masteringlinux.in

Previous names

Next names

DNS History

15 records (8 active, 7 former)

●NSanton.ns.cloudflare.com2026-08-21 → 2026-09-04 · 3 obs

○ 2016-12-20 09:17:52
● 2026-08-21 10:18:00
● 2026-09-04 09:18:30

●NSharlee.ns.cloudflare.com2026-08-21 → 2026-09-04 · 3 obs

○ 2016-12-20 09:17:52
● 2026-08-21 10:18:00
● 2026-09-04 09:18:30

○NSns1.domainmonster.com2016-12-20 → 2016-12-20 · 3 obs

● 2016-12-20 09:17:52
○ 2026-08-21 10:18:00
○ 2026-09-04 09:18:30

○NSns2.domainmonster.com2016-12-20 → 2016-12-20 · 3 obs

● 2016-12-20 09:17:52
○ 2026-08-21 10:18:00
○ 2026-09-04 09:18:30

○NSns3.domainmonster.com2016-12-20 → 2016-12-20 · 3 obs

● 2016-12-20 09:17:52
○ 2026-08-21 10:18:00
○ 2026-09-04 09:18:30

○MXmail.b-io.co2017-12-25 → 2017-12-25 · 4 obs

○ 2016-12-20 09:17:52
● 2017-12-25 17:52:58
○ 2026-08-21 10:18:00
○ 2026-09-04 09:18:30

○MXmx.emailconfig.com2016-12-20 → 2016-12-20 · 3 obs

● 2016-12-20 09:17:52
○ 2017-12-25 17:52:58
○ 2026-09-04 09:18:30

●MXmx1.privateemail.com2026-08-21 → 2026-09-04 · 3 obs

○ 2017-12-25 17:52:58
● 2026-08-21 10:18:00
● 2026-09-04 09:18:30

●MXmx2.privateemail.com2026-08-21 → 2026-09-04 · 3 obs

○ 2017-12-25 17:52:58
● 2026-08-21 10:18:00
● 2026-09-04 09:18:30

●A104.21.58.2432026-08-21 → 2026-09-04 · 3 obs

○ 2017-12-25 17:52:58
● 2026-08-21 10:18:00
● 2026-09-04 09:18:30

○A109.68.33.182016-12-20 → 2016-12-20 · 3 obs

● 2016-12-20 09:17:52
○ 2026-08-21 10:18:00
○ 2026-09-04 09:18:30

○A109.68.33.642017-12-25 → 2017-12-25 · 4 obs

○ 2016-12-20 09:17:52
● 2017-12-25 17:52:58
○ 2026-08-21 10:18:00
○ 2026-09-04 09:18:30

●A172.67.166.722026-08-21 → 2026-09-04 · 3 obs

○ 2017-12-25 17:52:58
● 2026-08-21 10:18:00
● 2026-09-04 09:18:30

●A2606:4700:3030::6815:3af32026-08-21 → 2026-09-04 · 3 obs

○ 2017-12-25 17:52:58
● 2026-08-21 10:18:00
● 2026-09-04 09:18:30

●A2606:4700:3030::ac43:a6482026-08-21 → 2026-09-04 · 3 obs

○ 2017-12-25 17:52:58
● 2026-08-21 10:18:00
● 2026-09-04 09:18:30

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
linuxmastering.com	harlee.ns.cloudflare.com, anton.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.194.238

NS records: harlee.ns.cloudflare.com, anton.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for linuxmastering.com (unsigned zone)

⏱️ Timing

Total: 238ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.58.243, 172.67.166.72`
AAAA	2	`2606:4700:3030::ac43:a648, 2606:4700:3030::6815:3af3`
NS	2	`anton.ns.cloudflare.com, harlee.ns.cloudflare.com`
MX	2	`mx2.privateemail.com (pri: 10), mx1.privateemail.com (pri: 9)`
TXT	1	`v=spf1 include:spf.privateemail.com ~all`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`anton.ns.cloudflare.com dns.cloudflare.c`

📌 Glue Records Collected

Total: 12

Out-of-bailiwick: 12 (harlee.ns.cloudflare.com, harlee.ns.cloudflare.com, harlee.ns.cloudflare.com...)

Analysis

IP Addresses

linuxmastering.com directs to four IP numbers, which are 104.21.58.243, 172.67.166.72, 2606:4700:3030::6815:3af3 and 2606:4700:3030::ac43:a648.

thegoodlocksmiths.co.uk, inmanstowing.com, services.timbuk.net and two other host names share IP numbers with linuxmastering.com.

Name Servers

Two name servers handle the delegation for linuxmastering.com: anton.ns.cloudflare.com and harlee.ns.cloudflare.com.

linuxmastering.com uses the same name servers as several other domains — among them yourlinuxtraining.net, automox.us, aistorybook.xyz and two more.

There is at least partial name server overlap between linuxmastering.com and other domains — kazyagiagrikremi.beauty, 9o3.xyz, conradfree.com and two more among them.

These name servers are routinely deployed together with the name servers mimi.ns.cloudflare.com.

Hostnames that resolve to 6 IP addresses:

anton.ns.cloudflare.com resolves to 108.162.195.175, 162.159.44.175 and 172.64.35.175 among others, with 3 other IP addresses in total.

harlee.ns.cloudflare.com resolves to 108.162.194.238, 162.159.38.238 and 172.64.34.238 among others, with 3 other IP addresses in total.

Mail Servers

Mail for linuxmastering.com is handled by two mail servers — mx1.privateemail.com and mx2.privateemail.com.

linuxmastering.com uses an identical mail server configuration to several other domains — among them velvetsolutions.ca, siuda.net, marinamrktng.com and two more.

linuxmastering.com has at least partial mail server overlap with other domains such as iqverse.university, asaploansusa.com, armaautomotive.com and two more.

mx1.privateemail.com → 162.255.118.7 and mx2.privateemail.com → 162.255.118.8: one IP number per host name.

linuxmastering.com - robtex.com