`course4you.com`

DNSSEC	⚠️ Not signed
A	2606:4700:3032::6815:1220^{🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3035::ac43:b3ea^{🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.18.32^{Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.179.234^{🇺🇸 Cloudflare172.67.176.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`blakely.ns.cloudflare.com` ⭐
		A	2606:4700:50::a29f:2660^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`blakely.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c260^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`blakely.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2260^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`blakely.ns.cloudflare.com`
		A	108.162.194.96^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`blakely.ns.cloudflare.com`
		A	162.159.38.96^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`blakely.ns.cloudflare.com`
		A	172.64.34.96^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`blakely.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`
MX	`route2.mx.cloudflare.net` ⭐
		A	2606:4700:f5::e^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	2606:4700:f5::f^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	2606:4700:f5::10^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.17^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.18^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.19^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
MX	`route3.mx.cloudflare.net`⁽⁵⁴⁾
		A	2606:4700:f5::11^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	2606:4700:f5::12^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	2606:4700:f5::13^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.23^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.24^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.25^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
MX	`route1.mx.cloudflare.net`⁽⁵⁹⁾
		A	2606:4700:f5::b^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	2606:4700:f5::c^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	2606:4700:f5::d^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.11^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.12^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.13^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
TXT	`v=spf1 include:_spf.mx.cloudflare.net ~all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4	104.21.18.32, 172.67.179.234
		IPv6	2606:4700:3032::6815:1220, 2606:4700:3035::ac43:b3ea
SOA	`blakely.ns.cloudflare.com`dns@cloudflare.com serial=2398628078

`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=1774560567

Same first word

course4you.com

Similar names

source4you.com

source4you.nl

DNS History

15 records (9 active, 6 former)

●NSblakely.ns.cloudflare.com2026-03-15 → 2026-03-26 · 3 obs

○ 2026-02-18 11:33:38
● 2026-03-15 14:43:18
● 2026-03-26 21:35:10

○NSns33.domaincontrol.com2015-08-23 → 2026-02-15 · 5 obs

○ 2008-03-16 13:57:46
● 2015-08-23 14:09:00
● 2026-02-15 11:43:48
○ 2026-02-18 11:33:38
○ 2026-03-26 21:35:10

○NSns34.domaincontrol.com2015-08-23 → 2026-02-15 · 5 obs

○ 2008-03-16 13:57:46
● 2015-08-23 14:09:00
● 2026-02-15 11:43:48
○ 2026-02-18 11:33:38
○ 2026-03-26 21:35:10

●NState.ns.cloudflare.com2026-03-15 → 2026-03-26 · 3 obs

○ 2026-02-18 11:33:38
● 2026-03-15 14:43:18
● 2026-03-26 21:35:10

○MXmailstore1.secureserver.net2015-08-23 → 2026-02-15 · 5 obs

○ 2008-03-16 13:57:46
● 2015-08-23 14:09:00
● 2026-02-15 11:43:48
○ 2026-02-18 11:33:38
○ 2026-03-26 21:35:10

●MXroute1.mx.cloudflare.net2026-03-15 → 2026-03-26 · 3 obs

○ 2026-02-18 11:33:38
● 2026-03-15 14:43:18
● 2026-03-26 21:35:10

●MXroute2.mx.cloudflare.net2026-03-15 → 2026-03-26 · 3 obs

○ 2026-02-18 11:33:38
● 2026-03-15 14:43:18
● 2026-03-26 21:35:10

●MXroute3.mx.cloudflare.net2026-03-15 → 2026-03-26 · 3 obs

○ 2026-02-18 11:33:38
● 2026-03-15 14:43:18
● 2026-03-26 21:35:10

○MXsmtp.secureserver.net2015-08-23 → 2026-02-15 · 5 obs

○ 2008-03-16 13:57:46
● 2015-08-23 14:09:00
● 2026-02-15 11:43:48
○ 2026-02-18 11:33:38
○ 2026-03-26 21:35:10

●A104.21.18.322026-03-15 → 2026-03-26 · 3 obs

○ 2026-02-18 11:33:38
● 2026-03-15 14:43:18
● 2026-03-26 21:35:10

●A172.67.179.2342026-03-15 → 2026-03-26 · 3 obs

○ 2026-02-18 11:33:38
● 2026-03-15 14:43:18
● 2026-03-26 21:35:10

○A184.168.221.532015-08-23 → 2016-04-04 · 5 obs

○ 2008-03-16 13:57:46
● 2015-08-23 14:09:00
● 2016-04-04 05:28:16
○ 2016-09-14 09:10:26
○ 2026-03-26 21:35:10

●A2606:4700:3032::6815:12202026-03-15 → 2026-03-26 · 3 obs

○ 2026-02-18 11:33:38
● 2026-03-15 14:43:18
● 2026-03-26 21:35:10

●A2606:4700:3035::ac43:b3ea2026-03-15 → 2026-03-26 · 3 obs

○ 2026-02-18 11:33:38
● 2026-03-15 14:43:18
● 2026-03-26 21:35:10

○A66.155.58.1092016-09-14 → 2026-02-15 · 5 obs

○ 2016-04-04 05:28:16
● 2016-09-14 09:10:26
● 2026-02-15 11:43:48
○ 2026-02-18 11:33:38
○ 2026-03-26 21:35:10

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
course4you.com	blakely.ns.cloudflare.com, tate.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.195.191

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for course4you.com (unsigned zone)

⏱️ Timing

Total: 179ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.18.32, 172.67.179.234`
AAAA	2	`2606:4700:3035::ac43:b3ea, 2606:4700:3032::6815:1220`
NS	2	`blakely.ns.cloudflare.com, tate.ns.cloudflare.com`
MX	3	`route2.mx.cloudflare.net (pri: 19), route3.mx.cloudflare.net (pri: 54)...`
TXT	1	`v=spf1 include:_spf.mx.cloudflare.net ~a`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`blakely.ns.cloudflare.com dns.cloudflare`

📌 Glue Records Collected

Total: 12

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

Analysis

IP Addresses

course4you.com resolves to four IP numbers: 2606:4700:3032::6815:1220, 2606:4700:3035::ac43:b3ea, 104.21.18.32 and 172.67.179.234.

other host names for instance rabinorony.com.br, b5t11.com, 3liexpress.com, ns1.tpws.ac.th and chilledkongs.com share IP numbers with course4you.com.

Name Servers

course4you.com is delegated to two name servers: blakely.ns.cloudflare.com and tate.ns.cloudflare.com.

course4you.com shares the same name server setup as other domains, for example silis.org, gmall-involceview-verilog-auth.pages.dev, argcomputers.com, mit.tv and silis.info.

course4you.com at least partially shares name servers with other domains, for instance sinerpro.it, gazetesaglik.com, suxess.net.cn, yeboss.com.cn and gzmdbb.cn.

These name servers are often used with sage.ns.cloudflare.com and susan.ns.cloudflare.com.

Host names with six IP numbers:

blakely.ns.cloudflare.com points to: 2606:4700:50::a29f:2660, 2803:f800:50::6ca2:c260, 2a06:98c1:50::ac40:2260, 108.162.194.96, 162.159.38.96 and 172.64.34.96; tate.ns.cloudflare.com points to: 2606:4700:58::a29f:2cbf, 2803:f800:50::6ca2:c3bf, 2a06:98c1:50::ac40:23bf, 108.162.195.191, 162.159.44.191 and 172.64.35.191.

Mail Servers

course4you.com is handled by three mail servers: route1.mx.cloudflare.net, route2.mx.cloudflare.net and route3.mx.cloudflare.net.

course4you.com shares mail servers with other domains at least partially, including csl-eng.com, medstolet.ru, inthemix.me, andymod.com and petabyte.cl.

Host names with six IP numbers: route1.mx.cloudflare.net points to: 2606:4700:f5::b, 2606:4700:f5::c, 2606:4700:f5::d, 162.159.205.11, 162.159.205.12 and 162.159.205.13; route2.mx.cloudflare.net points to: 2606:4700:f5::e, 2606:4700:f5::f, 2606:4700:f5::10, 162.159.205.17, 162.159.205.18 and 162.159.205.19; route3.mx.cloudflare.net points to: 2606:4700:f5::11, 2606:4700:f5::12, 2606:4700:f5::13, 162.159.205.23, 162.159.205.24 and 162.159.205.25.

course4you.com - robtex.com

course4you.com

com

Same first word

Similar names

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

📌 Glue Records Collected

Analysis

IP Addresses

Name Servers

Mail Servers

`course4you.com`

`com`