🛡️Domain Reputation CheckBlocklist, phishing & malware status→

`linuxcertification.org`

DNSSEC	⚠️ Not signed
A	2606:4700:3033::ac43:cf5a^{🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3034::6815:4d74^{🇺🇸 Cloudflare2606:4700:3034::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.77.116^{Cloudflare104.21.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.207.90^{🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`jillian.ns.cloudflare.com` ⭐
		A	2606:4700:50::a29f:262c^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jillian.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c22c^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`jillian.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:222c^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`jillian.ns.cloudflare.com`
		A	108.162.194.44^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jillian.ns.cloudflare.com`
		A	162.159.38.44^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jillian.ns.cloudflare.com`
		A	172.64.34.44^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jillian.ns.cloudflare.com`
NS	`tate.ns.cloudflare.com`
		A	2606:4700:58::a29f:2cbf^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`tate.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c3bf^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`tate.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:23bf^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`tate.ns.cloudflare.com`
		A	108.162.195.191^{🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`tate.ns.cloudflare.com`
		A	162.159.44.191^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`tate.ns.cloudflare.com`
		A	172.64.35.191^{🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`tate.ns.cloudflare.com`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.77.116, 172.67.207.90
		IPv6 hints	2606:4700:3033::ac43:cf5a, 2606:4700:3034::6815:4d74
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=45, name=cloudflare-ech.com
SOA	`jillian.ns.cloudflare.com`dns@cloudflare.com serial=2412352340

`org`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a0.org.afilias-nst.info` ⭐
	NS	`a2.org.afilias-nst.info`
	NS	`b0.org.afilias-nst.org`
	NS	`b2.org.afilias-nst.org`
	NS	`c0.org.afilias-nst.info`
	NS	`d0.org.afilias-nst.org`
	SOA	`a0.org.afilias-nst.info`hostmaster@donuts.email serial=1788924810

WOT: SAFE (71/100)

Previously MX for

linuxcertification.org

Same first word

linuxcertification.co.za

linuxcertification.biz

linuxcertification.org

linuxcertification.com

Previous names

Next names

DNS History

14 records (6 active, 8 former)

●NSjillian.ns.cloudflare.com2026-08-25 → 2026-09-09 · 3 obs

○ 2016-09-11 01:03:34
● 2026-08-25 21:58:30
● 2026-09-09 04:03:30

○NSns1.quicca.com2015-08-14 → 2016-09-11 · 4 obs

● 2015-08-14 16:51:06
● 2016-09-11 01:03:34
○ 2026-08-25 21:58:30
○ 2026-09-09 04:03:30

○NSns2.quicca.com2015-08-14 → 2016-09-11 · 4 obs

● 2015-08-14 16:51:06
● 2016-09-11 01:03:34
○ 2026-08-25 21:58:30
○ 2026-09-09 04:03:30

●NState.ns.cloudflare.com2026-08-25 → 2026-09-09 · 3 obs

○ 2016-09-11 01:03:34
● 2026-08-25 21:58:30
● 2026-09-09 04:03:30

○MXlinuxcertification.org2015-08-14 → 2016-09-11 · 4 obs

● 2015-08-14 16:51:06
● 2016-09-11 01:03:34
○ 2026-08-25 21:58:30
○ 2026-09-09 04:03:30

●A104.21.77.1162026-09-02 → 2026-09-09 · 3 obs

○ 2026-08-25 21:58:30
● 2026-09-02 06:43:36
● 2026-09-09 04:03:30

●A172.67.207.902026-09-02 → 2026-09-09 · 3 obs

○ 2026-08-25 21:58:30
● 2026-09-02 06:43:36
● 2026-09-09 04:03:30

○A188.114.96.02026-08-25 → 2026-08-25 · 4 obs

○ 2016-09-11 01:03:34
● 2026-08-25 21:58:30
○ 2026-09-02 06:43:36
○ 2026-09-09 04:03:30

○A188.114.97.02026-08-25 → 2026-08-25 · 4 obs

○ 2016-09-11 01:03:34
● 2026-08-25 21:58:30
○ 2026-09-02 06:43:36
○ 2026-09-09 04:03:30

●A2606:4700:3033::ac43:cf5a2026-09-02 → 2026-09-09 · 3 obs

○ 2026-08-25 21:58:30
● 2026-09-02 06:43:36
● 2026-09-09 04:03:30

●A2606:4700:3034::6815:4d742026-09-02 → 2026-09-09 · 3 obs

○ 2026-08-25 21:58:30
● 2026-09-02 06:43:36
● 2026-09-09 04:03:30

○A2a06:98c1:3120::2026-08-25 → 2026-08-25 · 4 obs

○ 2016-09-11 01:03:34
● 2026-08-25 21:58:30
○ 2026-09-02 06:43:36
○ 2026-09-09 04:03:30

○A2a06:98c1:3121::2026-08-25 → 2026-08-25 · 4 obs

○ 2016-09-11 01:03:34
● 2026-08-25 21:58:30
○ 2026-09-02 06:43:36
○ 2026-09-09 04:03:30

○A54.65.193.2022015-08-14 → 2016-09-11 · 4 obs

● 2015-08-14 16:51:06
● 2016-09-11 01:03:34
○ 2026-08-25 21:58:30
○ 2026-09-09 04:03:30

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
org	b0.org.afilias-nst.org, b2.org.afilias-nst.org, d0.org.afilias-nst.org	-
linuxcertification.org	tate.ns.cloudflare.com, jillian.ns.cloudflare.com	-

✅ Authoritative Response

Server:172.64.35.191

NS records: tate.ns.cloudflare.com, jillian.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for linuxcertification.org (unsigned zone)

⏱️ Timing

Total: 2403ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.77.116, 172.67.207.90`
AAAA	2	`2606:4700:3033::ac43:cf5a, 2606:4700:3034::6815:4d74`
NS	2	`jillian.ns.cloudflare.com, tate.ns.cloudflare.com`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`jillian.ns.cloudflare.com dns.cloudflare`

Analysis

IP Addresses

linuxcertification.org points to the four IP addresses 104.21.77.116, 172.67.207.90, 2606:4700:3033::ac43:cf5a and 2606:4700:3034::6815:4d74.

tobyn.me, tendernessashenwing.shop, aroostooksupplies.com and two other host names share IP numbers with linuxcertification.org.

Name Servers

linuxcertification.org has two authoritative name servers — jillian.ns.cloudflare.com and tate.ns.cloudflare.com.

linuxcertification.org uses the same name servers as several other domains — among them priaces.com, vibodarajaguru.com, clintonaibotway.com and two more.

At least some of linuxcertification.org's name servers are shared with other domains, for example projetoafrica.pages.dev, retromobler.dk, p(0x616e616c)obetwin.com and two more.

It is common for these name servers to be used in conjunction with the name servers lennox.ns.cloudflare.com, arya.ns.cloudflare.com and susan.ns.cloudflare.com.

Hostnames that resolve to 6 IP addresses:

jillian.ns.cloudflare.com points to 108.162.194.44, 162.159.38.44, 172.64.34.44 and 3 other IP addresses.

tate.ns.cloudflare.com points to 108.162.195.191, 162.159.44.191, 172.64.35.191 and 3 other IP addresses.

linuxcertification.org - robtex.com