🛡️Domain Reputation CheckBlocklist, phishing & malware status→

`classguide.study`

DNSSEC	⚠️ Not signed
A	2606:4700:3032::6815:3866^{🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3036::ac43:b7c4^{🇺🇸 Cloudflare2606:4700:3036::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.56.102^{Cloudflare104.21.48.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.183.196^{🇺🇸 Cloudflare172.67.176.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`dilbert.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3b9b^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`dilbert.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c19b^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`dilbert.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:219b^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`dilbert.ns.cloudflare.com`
		A	108.162.193.155^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`dilbert.ns.cloudflare.com`
		A	172.64.33.155^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`dilbert.ns.cloudflare.com`
		A	173.245.59.155^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`dilbert.ns.cloudflare.com`
NS	`hera.ns.cloudflare.com`
		A	2606:4700:50::adf5:3aa2^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`hera.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c0a2^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`hera.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:20a2^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`hera.ns.cloudflare.com`
		A	108.162.192.162^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`hera.ns.cloudflare.com`
		A	172.64.32.162^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`hera.ns.cloudflare.com`
		A	173.245.58.162^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`hera.ns.cloudflare.com`
MX	`smtp.google.com` ⭐
		A	2607:f8b0:4004:c08::1a^{🇺🇸 Google2607:f8b0:4004::/48}
			PTR	`bi-in-f26.1e100.net`
		A	2607:f8b0:4004:c08::1b^{🇺🇸 Google2607:f8b0:4004::/48}
			PTR	`bi-in-f27.1e100.net`
		A	2607:f8b0:4004:c0b::1a^{🇺🇸 Google2607:f8b0:4004::/48}
			PTR	`bj-in-f26.1e100.net`
		A	2607:f8b0:4004:c25::1b^{🇺🇸 Google2607:f8b0:4004::/48}
			PTR	`yuiadtq-in-f27.1e100.net`
		A	142.250.31.26^{🇺🇸 Google142.250.31.0/24}
			PTR	`bj-in-f26.1e100.net`
		A	142.250.31.27^{🇺🇸 Google142.250.31.0/24}
			PTR	`bj-in-f27.1e100.net`
		A	172.253.63.26^{🇺🇸 Google172.253.63.0/24}
			PTR	`bi-in-f26.1e100.net`
		A	172.253.63.27^{🇺🇸 Google172.253.63.0/24}
			PTR	`bi-in-f27.1e100.net`
		A	192.178.218.26^{🇺🇸 Google192.178.218.0/24}
			PTR	`yuiadtq-in-f26.1e100.net`
TXT	`google-site-verification=6Nk_G9RQ85YqN7gphXh1QTmL9IucxP7D8_J35w1bIZM`
TXT	`v=spf1 include:_spf.google.com ~all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.56.102, 172.67.183.196
		IPv6 hints	2606:4700:3032::6815:3866, 2606:4700:3036::ac43:b7c4
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=37, name=cloudflare-ech.com
SOA	`dilbert.ns.cloudflare.com`dns@cloudflare.com serial=2412559030

`study`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.nic.study` ⭐
	NS	`b.nic.study`
	NS	`c.nic.study`
	NS	`x.nic.study`
	NS	`y.nic.study`
	NS	`z.nic.study`
	SOA	`a.nic.study`admin@tldns.godaddy serial=1788151586

Same first word

classguide.study

classguide.com

Similar names

guideclass.com

guideclass.fun

Previous names

Next names

DNS History

11 records (7 active, 4 former)

●NSdilbert.ns.cloudflare.com2026-08-22 → 2026-08-31 · 2 obs

● 2026-08-22 20:39:12
● 2026-08-31 06:05:42

●NShera.ns.cloudflare.com2026-08-22 → 2026-08-31 · 2 obs

● 2026-08-22 20:39:12
● 2026-08-31 06:05:42

●MXsmtp.google.com2026-08-22 → 2026-08-31 · 2 obs

● 2026-08-22 20:39:12
● 2026-08-31 06:05:42

●A104.21.56.1022026-08-23 → 2026-08-31 · 5 obs

○ 2026-08-22 20:39:12
● 2026-08-23 18:43:36
○ 2026-08-28 21:41:16
● 2026-08-29 07:05:42
● 2026-08-31 06:05:42

●A172.67.183.1962026-08-23 → 2026-08-31 · 5 obs

○ 2026-08-22 20:39:12
● 2026-08-23 18:43:36
○ 2026-08-28 21:41:16
● 2026-08-29 07:05:42
● 2026-08-31 06:05:42

○A188.114.96.02026-08-22 → 2026-08-28 · 5 obs

● 2026-08-22 20:39:12
○ 2026-08-23 18:43:36
● 2026-08-28 21:41:16
○ 2026-08-29 07:05:42
○ 2026-08-31 06:05:42

○A188.114.97.02026-08-22 → 2026-08-28 · 5 obs

● 2026-08-22 20:39:12
○ 2026-08-23 18:43:36
● 2026-08-28 21:41:16
○ 2026-08-29 07:05:42
○ 2026-08-31 06:05:42

●A2606:4700:3032::6815:38662026-08-23 → 2026-08-31 · 5 obs

○ 2026-08-22 20:39:12
● 2026-08-23 18:43:36
○ 2026-08-28 21:41:16
● 2026-08-29 07:05:42
● 2026-08-31 06:05:42

●A2606:4700:3036::ac43:b7c42026-08-23 → 2026-08-31 · 5 obs

○ 2026-08-22 20:39:12
● 2026-08-23 18:43:36
○ 2026-08-28 21:41:16
● 2026-08-29 07:05:42
● 2026-08-31 06:05:42

○A2a06:98c1:3120::2026-08-22 → 2026-08-28 · 5 obs

● 2026-08-22 20:39:12
○ 2026-08-23 18:43:36
● 2026-08-28 21:41:16
○ 2026-08-29 07:05:42
○ 2026-08-31 06:05:42

○A2a06:98c1:3121::2026-08-22 → 2026-08-28 · 5 obs

● 2026-08-22 20:39:12
○ 2026-08-23 18:43:36
● 2026-08-28 21:41:16
○ 2026-08-29 07:05:42
○ 2026-08-31 06:05:42

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
study	b.nic.study, x.nic.study, a.nic.study, y.nic.study...	12 records
classguide.study	hera.ns.cloudflare.com, dilbert.ns.cloudflare.com	-

✅ Authoritative Response

Server:108.162.192.162

NS records: hera.ns.cloudflare.com, dilbert.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for classguide.study (unsigned zone)

⏱️ Timing

Total: 689ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.183.196, 104.21.56.102`
AAAA	2	`2606:4700:3032::6815:3866, 2606:4700:3036::ac43:b7c4`
NS	2	`dilbert.ns.cloudflare.com, hera.ns.cloudflare.com`
MX	1	`smtp.google.com (pri: 1)`
TXT	2	`google-site-verification=6Nk_G9RQ85YqN7g, v=spf1 include:_spf.google.com ~all`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`dilbert.ns.cloudflare.com dns.cloudflare`

📌 Glue Records Collected

Total: 12

In-bailiwick: 12 (z.nic.study, y.nic.study, x.nic.study...)

Analysis

IP Addresses

classguide.study has four IP addresses: 104.21.56.102, 172.67.183.196, 2606:4700:3032::6815:3866 and 2606:4700:3036::ac43:b7c4.

casino8720.buzz, invest254.com, texaspassports.com plus two other host names have IP numbers in common with classguide.study.

Name Servers

classguide.study is served by two delegated name servers, dilbert.ns.cloudflare.com and hera.ns.cloudflare.com.

The name server configuration of classguide.study is shared with other domains, for instance leanlabsdemand.info, ethicalalphaleadglide.com, xn--80akmgqeifceg0c.xn--p1ai and two others.

classguide.study has at least partial name server overlap with other domains, such as mmtoyshop.com, 17zoo5d1tuiuzpkgb.workers.dev, artsalon.kiev.ua and two others.

It is common to find these name servers paired with the name servers kara.ns.cloudflare.com.

Hosts with 6 IP addresses each:

dilbert.ns.cloudflare.com carries IP addresses 108.162.193.155, 172.64.33.155 and 173.245.59.155, with 3 other addresses beyond those.

hera.ns.cloudflare.com carries IP addresses 108.162.192.162, 172.64.32.162 and 173.245.58.162, with 3 other addresses beyond those.

Mail Servers

classguide.study uses one mail server — smtp.google.com.

The mail server setup of classguide.study matches that of other domains such as randr.jp, veronasa.com, ebisusushi.jp and two others.

At least some of the mail servers used by classguide.study are shared with other domains: succedestudio.com, evolvesquadsstaff.com, soutronpartner.com and two others among them.

smtp.google.com has 9 IP addresses: 142.250.31.26, 142.250.31.27, 172.253.63.26 plus 6 more.

classguide.study - robtex.com