courseadvisor.com - dns.ninja

`courseadvisor.com`

DNSSEC	⚠️ Not signed
A	2606:4700:3031::ac43:cf1d^{🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3037::6815:16d5^{🇺🇸 Cloudflare2606:4700:3037::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.22.213^{Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.207.29^{🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`gordon.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3baa^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`gordon.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c1aa^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`gordon.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:21aa^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`gordon.ns.cloudflare.com`
		A	108.162.193.170^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`gordon.ns.cloudflare.com`
		A	172.64.33.170^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`gordon.ns.cloudflare.com`
		A	173.245.59.170^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`gordon.ns.cloudflare.com`
NS	`sandy.ns.cloudflare.com`
		A	2606:4700:50::adf5:3adb^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`sandy.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c0db^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`sandy.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:20db^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`sandy.ns.cloudflare.com`
		A	108.162.192.219^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`sandy.ns.cloudflare.com`
		A	172.64.32.219^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`sandy.ns.cloudflare.com`
		A	173.245.58.219^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`sandy.ns.cloudflare.com`
MX	`mx1.emailsrvr.com` ⭐
		A	184.106.54.1^{🇺🇸 RACKSPACE-ORD184.106.54.0/24 Rackspace ORD}
			PTR	`mx1.emailsrvr.com`
MX	`mx2.emailsrvr.com`⁽²⁰⁾
		A	184.106.54.2^{🇺🇸 RACKSPACE-ORD184.106.54.0/24 Rackspace ORD}
			PTR	`mx2.emailsrvr.com`
TXT	`google-site-verification=cZYlKIxAlPnOJvAIhEpzMxM-TWvxckidqiY9lR3FBZ0`
TXT	`v=spf1 include:spf.protection.outlook.com -all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.22.213, 172.67.207.29
		IPv6 hints	2606:4700:3031::ac43:cf1d, 2606:4700:3037::6815:16d5
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=95, name=cloudflare-ech.com
SOA	`gordon.ns.cloudflare.com`dns@cloudflare.com serial=2408789390

`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=1785702307

rank #668051 globally
rank #279185 in the tld
WOT: SUSPICIOUS (28/100)
📈 Tranco rank: #511,080

Subdomains

forms.courseadvisor.com

static0.courseadvisor.com

images.courseadvisor.com

rsx1.courseadvisor.com

srv.courseadvisor.com

Same first word

courseadvisor.nl

courseadvisor.com

courseadvisor.biz

Similar names

advisorsource.com

sourceadvisor.com

DNS History

23 records (8 active, 15 former)

●NSgordon.ns.cloudflare.com2026-02-15 → 2026-08-02 · 3 obs

○ 2017-09-08 12:22:26
● 2026-02-15 11:43:14
● 2026-08-02 20:55:20

○NSns1.no-ip.com2015-07-17 → 2017-09-08 · 4 obs

● 2015-07-17 20:39:34
● 2017-09-08 12:22:26
○ 2026-02-15 11:43:14
○ 2026-08-02 20:55:20

○NSns2.no-ip.com2015-07-17 → 2017-09-08 · 4 obs

● 2015-07-17 20:39:34
● 2017-09-08 12:22:26
○ 2026-02-15 11:43:14
○ 2026-08-02 20:55:20

○NSns3.no-ip.com2015-07-17 → 2017-09-08 · 4 obs

● 2015-07-17 20:39:34
● 2017-09-08 12:22:26
○ 2026-02-15 11:43:14
○ 2026-08-02 20:55:20

○NSns4.no-ip.com2015-07-17 → 2017-09-08 · 4 obs

● 2015-07-17 20:39:34
● 2017-09-08 12:22:26
○ 2026-02-15 11:43:14
○ 2026-08-02 20:55:20

○NSns5.no-ip.com2015-07-17 → 2017-09-08 · 4 obs

● 2015-07-17 20:39:34
● 2017-09-08 12:22:26
○ 2026-02-15 11:43:14
○ 2026-08-02 20:55:20

●NSsandy.ns.cloudflare.com2026-02-15 → 2026-08-02 · 3 obs

○ 2017-09-08 12:22:26
● 2026-02-15 11:43:14
● 2026-08-02 20:55:20

○MXcourseadvisor-com.mail.protection.outlook.com2015-10-17 → 2017-09-08 · 5 obs

○ 2015-10-15 02:06:08
● 2015-10-17 02:42:26
● 2017-09-08 12:22:26
○ 2026-02-15 11:43:14
○ 2026-08-02 20:55:20

●MXmx1.emailsrvr.com2026-02-15 → 2026-08-02 · 3 obs

○ 2017-09-08 12:22:26
● 2026-02-15 11:43:14
● 2026-08-02 20:55:20

●MXmx2.emailsrvr.com2026-02-15 → 2026-08-02 · 3 obs

○ 2017-09-08 12:22:26
● 2026-02-15 11:43:14
● 2026-08-02 20:55:20

○MXserver1.inboundmx.com2015-07-17 → 2015-10-15 · 4 obs

● 2015-07-17 20:39:34
● 2015-10-15 02:06:08
○ 2015-10-17 02:42:26
○ 2026-08-02 20:55:20

○MXserver2.inboundmx.com2015-07-17 → 2015-10-15 · 4 obs

● 2015-07-17 20:39:34
● 2015-10-15 02:06:08
○ 2015-10-17 02:42:26
○ 2026-08-02 20:55:20

●A104.21.22.2132026-02-15 → 2026-08-02 · 16 obs

○ 2017-09-08 12:22:26
● 2026-02-15 11:43:14
○ 2026-02-24 19:46:24
● 2026-02-26 08:07:54
○ 2026-03-01 11:42:18
● 2026-03-11 04:06:20
● 2026-04-04 05:52:04
○ 2026-04-05 19:06:58
● 2026-05-01 06:48:26
● 2026-06-07 13:46:22
○ 2026-06-08 11:03:56
● 2026-06-09 18:46:22
● 2026-06-15 18:34:00
○ 2026-06-16 07:10:20
● 2026-06-21 21:00:32
● 2026-08-02 20:55:20

○A162.221.74.1302015-07-17 → 2017-09-08 · 4 obs

● 2015-07-17 20:39:34
● 2017-09-08 12:22:26
○ 2026-02-15 11:43:14
○ 2026-08-02 20:55:20

●A172.67.207.292026-02-15 → 2026-08-02 · 16 obs

○A188.114.96.02026-02-24 → 2026-06-16 · 15 obs

○ 2026-02-15 11:43:14
● 2026-02-24 19:46:24
○ 2026-02-26 08:07:54
● 2026-03-01 11:42:18
○ 2026-03-11 04:06:20
○ 2026-04-04 05:52:04
● 2026-04-05 19:06:58
○ 2026-05-01 06:48:26
○ 2026-06-07 13:46:22
● 2026-06-08 11:03:56
○ 2026-06-09 18:46:22
○ 2026-06-15 18:34:00
● 2026-06-16 07:10:20
○ 2026-06-21 21:00:32
○ 2026-08-02 20:55:20

○A188.114.97.02026-02-24 → 2026-06-16 · 15 obs

○A2606:4700:3030::6815:16d52026-02-15 → 2026-06-21 · 17 obs

●A2606:4700:3031::ac43:cf1d2026-07-18 → 2026-08-02 · 3 obs

○ 2026-06-21 21:00:32
● 2026-07-18 05:51:44
● 2026-08-02 20:55:20

○A2606:4700:3035::ac43:cf1d2026-02-15 → 2026-06-21 · 17 obs

●A2606:4700:3037::6815:16d52026-07-18 → 2026-08-02 · 3 obs

○ 2026-06-21 21:00:32
● 2026-07-18 05:51:44
● 2026-08-02 20:55:20

○A2a06:98c1:3120::2026-02-24 → 2026-06-16 · 15 obs

○A2a06:98c1:3121::2026-02-24 → 2026-06-16 · 15 obs

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
courseadvisor.com	gordon.ns.cloudflare.com, sandy.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.192.219

NS records: gordon.ns.cloudflare.com, sandy.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for courseadvisor.com (unsigned zone)

⏱️ Timing

Total: 196ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.207.29, 104.21.22.213`
AAAA	2	`2606:4700:3031::ac43:cf1d, 2606:4700:3037::6815:16d5`
NS	2	`gordon.ns.cloudflare.com, sandy.ns.cloudflare.com`
MX	2	`mx1.emailsrvr.com (pri: 10), mx2.emailsrvr.com (pri: 20)`
TXT	2	`google-site-verification=cZYlKIxAlPnOJvA, v=spf1 include:spf.protection.outlook.co`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`gordon.ns.cloudflare.com dns.cloudflare.`

📌 Glue Records Collected

Total: 12

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

Analysis

Hierarchy

courseadvisor.com has five child domains: forms.courseadvisor.com, static0.courseadvisor.com, images.courseadvisor.com, rsx1.courseadvisor.com and srv.courseadvisor.com.

IP Addresses

courseadvisor.com points to the four IP addresses 104.21.22.213, 172.67.207.29, 2606:4700:3031::ac43:cf1d and 2606:4700:3037::6815:16d5.

Among the host names that share IP numbers with courseadvisor.com are mail.sportit.at, aqua-tech.dk, www.otrbreakdown.ca and two others.

Name Servers

Two name servers handle the delegation for courseadvisor.com: gordon.ns.cloudflare.com and sandy.ns.cloudflare.com.

courseadvisor.com has the same name server delegation as a number of other domains, such as bestratereferrals.biz, med.insure, thedmsgrp.com and two more.

There is at least partial name server overlap between courseadvisor.com and other domains — jchsistemas.com, ast-park.ru, emergeco.org and two more among them.

These name servers frequently co-occur with the name servers aspen.ns.cloudflare.com and jerry.ns.cloudflare.com.

Host names resolving to 6 IP numbers:

gordon.ns.cloudflare.com resolves to 108.162.193.170, 172.64.33.170 and 173.245.59.170 among others, with 3 other IP addresses in total.

sandy.ns.cloudflare.com resolves to 108.162.192.219, 172.64.32.219 and 173.245.58.219 among others, with 3 other IP addresses in total.

Mail Servers

The MX records for courseadvisor.com point to two mail servers: mx1.emailsrvr.com and mx2.emailsrvr.com.

courseadvisor.com has the same mail server arrangement as a number of other domains, for example tufftanks.com.au, jotangia.com, ber.legal and two more.

courseadvisor.com shares at least some of its mail servers with other domains — for example kamacademy.com, sicomtbproducts.com, replacemycontacts.com and two more.

mx1.emailsrvr.com → 184.106.54.1 and mx2.emailsrvr.com → 184.106.54.2: one IP number per host name.