🛡️Domain Reputation CheckBlocklist, phishing & malware status→

`linuxstudyguide.online`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::6815:2463^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3031::ac43:c04f^{🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.36.99^{Cloudflare104.21.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.192.79^{🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`dahlia.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3a59^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`dahlia.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c059^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`dahlia.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2059^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`dahlia.ns.cloudflare.com`
		A	108.162.192.89^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`dahlia.ns.cloudflare.com`
		A	172.64.32.89^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`dahlia.ns.cloudflare.com`
		A	173.245.58.89^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`dahlia.ns.cloudflare.com`
NS	`robert.ns.cloudflare.com`
		A	2606:4700:58::a29f:2c8c^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`robert.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c38c^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`robert.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:238c^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`robert.ns.cloudflare.com`
		A	108.162.195.140^{🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`robert.ns.cloudflare.com`
		A	162.159.44.140^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`robert.ns.cloudflare.com`
		A	172.64.35.140^{🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`robert.ns.cloudflare.com`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.36.99, 172.67.192.79
		IPv6 hints	2606:4700:3030::6815:2463, 2606:4700:3031::ac43:c04f
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=233, name=cloudflare-ech.com
SOA	`dahlia.ns.cloudflare.com`dns@cloudflare.com serial=2416568833

`online`

	DNSSEC	🔒 Signed (DS record present)
	NS	`ns01.trs-dns.com` ⭐
	NS	`ns.trs-dns.com`
	NS	`ns01.trs-dns.net`
	NS	`ns10.trs-dns.info`
	NS	`ns10.trs-dns.org`
	SOA	`ns.trs-dns.com`trs-ops@tucows.com serial=1793369918

⚠️ On DNS blocklist: spam-tlds

Same first word

linuxstudyguide.com

linuxstudyguide.online

Previous names

Next names

DNS History

10 records (6 active, 4 former)

●NSdahlia.ns.cloudflare.com2026-10-04 → 2026-10-30 · 2 obs

● 2026-10-04 03:29:14
● 2026-10-30 15:04:40

●NSrobert.ns.cloudflare.com2026-10-04 → 2026-10-30 · 2 obs

● 2026-10-04 03:29:14
● 2026-10-30 15:04:40

●A104.21.36.992026-10-25 → 2026-10-30 · 3 obs

○ 2026-10-04 03:29:14
● 2026-10-25 09:52:46
● 2026-10-30 15:04:40

●A172.67.192.792026-10-25 → 2026-10-30 · 3 obs

○ 2026-10-04 03:29:14
● 2026-10-25 09:52:46
● 2026-10-30 15:04:40

○A188.114.96.02026-10-04 → 2026-10-04 · 3 obs

● 2026-10-04 03:29:14
○ 2026-10-25 09:52:46
○ 2026-10-30 15:04:40

○A188.114.97.02026-10-04 → 2026-10-04 · 3 obs

● 2026-10-04 03:29:14
○ 2026-10-25 09:52:46
○ 2026-10-30 15:04:40

●A2606:4700:3030::6815:24632026-10-25 → 2026-10-30 · 3 obs

○ 2026-10-04 03:29:14
● 2026-10-25 09:52:46
● 2026-10-30 15:04:40

●A2606:4700:3031::ac43:c04f2026-10-25 → 2026-10-30 · 3 obs

○ 2026-10-04 03:29:14
● 2026-10-25 09:52:46
● 2026-10-30 15:04:40

○A2a06:98c1:3120::2026-10-04 → 2026-10-04 · 3 obs

● 2026-10-04 03:29:14
○ 2026-10-25 09:52:46
○ 2026-10-30 15:04:40

○A2a06:98c1:3121::2026-10-04 → 2026-10-04 · 3 obs

● 2026-10-04 03:29:14
○ 2026-10-25 09:52:46
○ 2026-10-30 15:04:40

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
online	ns01.trs-dns.com, ns01.trs-dns.net, ns10.trs-dns.org, ns10.trs-dns.info	8 records
linuxstudyguide.online	robert.ns.cloudflare.com, dahlia.ns.cloudflare.com	-

✅ Authoritative Response

Server:172.64.35.140

NS records: robert.ns.cloudflare.com, dahlia.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for linuxstudyguide.online (unsigned zone)

⏱️ Timing

Total: 2218ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.192.79, 104.21.36.99`
AAAA	2	`2606:4700:3030::6815:2463, 2606:4700:3031::ac43:c04f`
NS	2	`dahlia.ns.cloudflare.com, robert.ns.cloudflare.com`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`dahlia.ns.cloudflare.com dns.cloudflare.`

📌 Glue Records Collected

Total: 8

Out-of-bailiwick: 8 (ns01.trs-dns.com, ns01.trs-dns.net, ns10.trs-dns.org...)

Analysis

IP Addresses

linuxstudyguide.online resolves to four IP addresses: 104.21.36.99, 172.67.192.79, 2606:4700:3030::6815:2463 and 2606:4700:3031::ac43:c04f.

Two other host names, along with feed-49217.yourchain.info, kuicapital.com and deft-warrantorship.com, also share IP numbers with linuxstudyguide.online.

Name Servers

linuxstudyguide.online has two authoritative name servers — dahlia.ns.cloudflare.com and robert.ns.cloudflare.com.

linuxstudyguide.online shares its NS records with other domains, for example 0415-4cs.pages.dev, seon-jin.kr, santehrum.ru and two others.

linuxstudyguide.online partially shares its NS delegation with several other domains, including lojal28061-3689-0-vqx.pages.dev, monetize-dewa188.pages.dev, djtonyd.com and two others.

These name servers often co-occur with the name servers sullivan.ns.cloudflare.com.

DNS names with 6 IP addresses:

dahlia.ns.cloudflare.com points to 108.162.192.89, 172.64.32.89, 173.245.58.89 and 3 other IP addresses.

robert.ns.cloudflare.com points to 108.162.195.140, 162.159.44.140, 172.64.35.140 and 3 other IP addresses.

linuxstudyguide.online - robtex.com