course-notes.org - dns.ninja

`course-notes.org`

DNSSEC	⚠️ Not signed
A	2606:4700:3033::ac43:82e7^{🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3037::6815:39b^{🇺🇸 Cloudflare2606:4700:3037::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.3.155^{Cloudflare104.21.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.130.231^{🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`gina.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3a75^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`gina.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c075^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`gina.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2075^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`gina.ns.cloudflare.com`
		A	108.162.192.117^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`gina.ns.cloudflare.com`
		A	172.64.32.117^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`gina.ns.cloudflare.com`
		A	173.245.58.117^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`gina.ns.cloudflare.com`
NS	`theo.ns.cloudflare.com`
		A	2606:4700:58::adf5:3b90^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`theo.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c190^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`theo.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2190^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`theo.ns.cloudflare.com`
		A	108.162.193.144^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`theo.ns.cloudflare.com`
		A	172.64.33.144^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`theo.ns.cloudflare.com`
		A	173.245.59.144^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`theo.ns.cloudflare.com`
MX	`aspmx.l.google.com` ⭐
		A	2607:f8b0:4004:c1b::1b^{🇺🇸 Google2607:f8b0:4004::/48}
			PTR	`wv-in-f27.1e100.net`
		A	172.253.63.26^{🇺🇸 Google172.253.63.0/24}
			PTR	`bi-in-f26.1e100.net`
MX	`alt1.aspmx.l.google.com`⁽⁵⁾
		A	2800:3f0:4003:c14::1a^{🇨🇱 Google2800:3f0:4003::/48}
		A	192.178.234.27^{🇺🇸 Google192.178.0.0/15}
			PTR	`ncsclj-in-f27.1e100.net`
MX	`alt2.aspmx.l.google.com`⁽⁵⁾
		A	2a00:1450:400b:c02::1a^{🇮🇪 Google2a00:1450:400b::/48}
			PTR	`dj-in-f26.1e100.net`
		A	172.253.116.26^{🇺🇸 Google172.253.116.0/24}
			PTR	`dj-in-f26.1e100.net`
MX	`aspmx2.googlemail.com`⁽¹⁰⁾
		A	2800:3f0:4003:c14::1a^{🇨🇱 Google2800:3f0:4003::/48}
		A	192.178.234.26^{🇺🇸 Google192.178.0.0/15}
			PTR	`ncsclj-in-f26.1e100.net`
MX	`aspmx3.googlemail.com`⁽¹⁰⁾
		A	2a00:1450:400b:c02::1a^{🇮🇪 Google2a00:1450:400b::/48}
			PTR	`dj-in-f26.1e100.net`
		A	172.253.116.26^{🇺🇸 Google172.253.116.0/24}
			PTR	`dj-in-f26.1e100.net`
TXT	`ahrefs-site-verification_261b4423cbced42a77f357444c4c8a1e089059832c98be462744...`
TXT	`botify-site-verification=bTeSCTDkqm84UWy6mN7uCCqTjhXDoG5X`
TXT	`ca3-850f3c080338410abcd78e53272b14a1`
TXT	`v=spf1 include:_spf.google.com include:sparkpostmail.com -all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.3.155, 172.67.130.231
		IPv6 hints	2606:4700:3033::ac43:82e7, 2606:4700:3037::6815:39b
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=99, name=cloudflare-ech.com
SOA	`gina.ns.cloudflare.com`dns@cloudflare.com serial=2411203625

`org`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a0.org.afilias-nst.info` ⭐ ⚠️ Not in parent delegation
	NS	`a2.org.afilias-nst.info` ⚠️ Not in parent delegation
	NS	`b0.org.afilias-nst.org`
	NS	`b2.org.afilias-nst.org`
	NS	`c0.org.afilias-nst.info` ⚠️ Not in parent delegation
	NS	`d0.org.afilias-nst.org`
	SOA	`a0.org.afilias-nst.info`hostmaster@donuts.email serial=1786294729

rank #437688 globally
rank #33825 in the tld
WOT: SAFE (94/100)
📈 Tranco rank: #875,881

Same first word

course-notes.com

course-notes.org

DNS History

15 records (11 active, 4 former)

●NSgina.ns.cloudflare.com2015-08-08 → 2026-08-09 · 2 obs

● 2015-08-08 10:19:56
● 2026-08-09 17:14:16

●NStheo.ns.cloudflare.com2015-08-08 → 2026-08-09 · 2 obs

● 2015-08-08 10:19:56
● 2026-08-09 17:14:16

●MXalt1.aspmx.l.google.com2015-08-08 → 2026-08-09 · 2 obs

● 2015-08-08 10:19:56
● 2026-08-09 17:14:16

●MXalt2.aspmx.l.google.com2015-08-08 → 2026-08-09 · 2 obs

● 2015-08-08 10:19:56
● 2026-08-09 17:14:16

●MXaspmx.l.google.com2015-08-08 → 2026-08-09 · 2 obs

● 2015-08-08 10:19:56
● 2026-08-09 17:14:16

●MXaspmx2.googlemail.com2015-08-08 → 2026-08-09 · 2 obs

● 2015-08-08 10:19:56
● 2026-08-09 17:14:16

●MXaspmx3.googlemail.com2015-08-08 → 2026-08-09 · 2 obs

● 2015-08-08 10:19:56
● 2026-08-09 17:14:16

●A104.21.3.1552021-05-20 → 2026-08-09 · 3 obs

○ 2017-02-13 11:10:04
● 2021-05-20 13:03:02
● 2026-08-09 17:14:16

○A104.28.2.472015-08-08 → 2017-02-13 · 4 obs

● 2015-08-08 10:19:56
● 2017-02-13 11:10:04
○ 2021-05-20 13:03:02
○ 2026-08-09 17:14:16

○A104.28.3.472015-08-08 → 2017-02-13 · 4 obs

● 2015-08-08 10:19:56
● 2017-02-13 11:10:04
○ 2021-05-20 13:03:02
○ 2026-08-09 17:14:16

●A172.67.130.2312021-05-20 → 2026-08-09 · 3 obs

○ 2017-02-13 11:10:04
● 2021-05-20 13:03:02
● 2026-08-09 17:14:16

○A2400:cb00:2048:1::681c:22f2016-12-30 → 2017-02-13 · 5 obs

○ 2015-08-08 10:19:56
● 2016-12-30 14:02:22
● 2017-02-13 11:10:04
○ 2021-05-20 13:03:02
○ 2026-08-09 17:14:16

○A2400:cb00:2048:1::681c:32f2016-12-30 → 2017-02-13 · 5 obs

○ 2015-08-08 10:19:56
● 2016-12-30 14:02:22
● 2017-02-13 11:10:04
○ 2021-05-20 13:03:02
○ 2026-08-09 17:14:16

●A2606:4700:3033::ac43:82e72021-05-20 → 2026-08-09 · 3 obs

○ 2017-02-13 11:10:04
● 2021-05-20 13:03:02
● 2026-08-09 17:14:16

●A2606:4700:3037::6815:39b2021-05-20 → 2026-08-09 · 3 obs

○ 2017-02-13 11:10:04
● 2021-05-20 13:03:02
● 2026-08-09 17:14:16

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
org	b0.org.afilias-nst.org, d0.org.afilias-nst.org, b2.org.afilias-nst.org	-
course-notes.org	theo.ns.cloudflare.com, gina.ns.cloudflare.com	-

✅ Authoritative Response

Server:173.245.59.144

NS records: theo.ns.cloudflare.com, gina.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for course-notes.org (unsigned zone)

⏱️ Timing

Total: 488ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.3.155, 172.67.130.231`
AAAA	2	`2606:4700:3033::ac43:82e7, 2606:4700:3037::6815:39b`
NS	2	`gina.ns.cloudflare.com, theo.ns.cloudflare.com`
MX	5	`aspmx.l.google.com (pri: 1), aspmx2.googlemail.com (pri: 10)...`
TXT	4	`ahrefs-site-verification_261b4423cbced42, botify-site-verification=bTeSCTDkqm84UWy...`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`gina.ns.cloudflare.com dns.cloudflare.co`

Analysis

IP Addresses

course-notes.org has four IP addresses: 104.21.3.155, 172.67.130.231, 2606:4700:3033::ac43:82e7 and 2606:4700:3037::6815:39b.

cibenix.com, m123maju.store, casinogames.com.co and two other host names share IP numbers with course-notes.org.

Name Servers

course-notes.org has two authoritative name servers — gina.ns.cloudflare.com and theo.ns.cloudflare.com.

course-notes.org uses the same name servers as several other domains — among them temposlottop.online, helpspecs.com, erub.net and two more.

course-notes.org partially shares its NS delegation with several other domains, including duluthattorneys.com, kontoinfakt.pl, careerloomhq.com and two others.

The name servers gwen.ns.cloudflare.com, galilea.ns.cloudflare.com, pablo.ns.cloudflare.com and dave.ns.cloudflare.com are often found in use alongside these name servers.

Hostnames that resolve to 6 IP addresses:

gina.ns.cloudflare.com points to 108.162.192.117, 172.64.32.117, 173.245.58.117 and 3 other IP addresses.

theo.ns.cloudflare.com points to 108.162.193.144, 172.64.33.144, 173.245.59.144 and 3 other IP addresses.

Mail Servers

Mail for course-notes.org is handled by five mail servers, namely aspmx2.googlemail.com, aspmx3.googlemail.com, aspmx.l.google.com and two others.

course-notes.org has at least partial mail server overlap with other domains such as ns500759.ns500698.ns500759.ns500759.ns500736.ns500698.ns500698.ns500736.ns500735.ns500736.ns500698.ns500708.ns500576.ns500686.ns500576.ns500619.trackreceptor.com, ns500699.ns500734.ns500693.ns500699.ns500734.ns500693.ns500699.ns500699.ns500588.ns500693.ns500699.ns500588.ns500632.ns500588.ns500578.ns500110.dtrkdll.com, ns500742.ns500731.ns500754.ns500754.ns500704.ns500704.ns500704.ns500742.ns500731.ns500688.ns500688.ns500704.ns500671.ns500291.ns500291.ns500291.ns500131.lustychickser.com and two more.

These mail servers commonly co-occur with mail servers alt1.aspmx.l.google.com, alt2.aspmx.l.google.com, alt3.aspmx.l.google.com and 3 others.

Hostnames that resolve to two IP addresses:

aspmx2.googlemail.com resolves to 192.178.234.26 and 2800:3f0:4003:c14::1a.

aspmx3.googlemail.com resolves to 172.253.116.26 and 2a00:1450:400b:c02::1a.

aspmx.l.google.com resolves to 172.253.63.26 and 2607:f8b0:4004:c1b::1b.

alt1.aspmx.l.google.com resolves to 192.178.234.27 and 2800:3f0:4003:c14::1a.

alt2.aspmx.l.google.com resolves to 172.253.116.26 and 2a00:1450:400b:c02::1a.

The host names aspmx2.googlemail.com and alt1.aspmx.l.google.com both resolve to 2800:3f0:4003:c14::1a IP addresses.

The host names aspmx3.googlemail.com and alt2.aspmx.l.google.com both resolve to 2a00:1450:400b:c02::1a IP addresses.

The host names aspmx3.googlemail.com and alt2.aspmx.l.google.com both resolve to 172.253.116.26 IP addresses.