coursebook.com - dns.ninja

`coursebook.com`

DNSSEC	🔒 Signed (DS record present)
A	2606:4700:3032::ac43:9532^{🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3034::6815:37a2^{🇺🇸 Cloudflare2606:4700:3034::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.55.162^{Cloudflare104.21.48.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.149.50^{🇺🇸 Cloudflare172.67.144.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`arch.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3b44^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`arch.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c144^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`arch.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2144^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`arch.ns.cloudflare.com`
		A	108.162.193.68^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`arch.ns.cloudflare.com`
		A	172.64.33.68^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`arch.ns.cloudflare.com`
		A	173.245.59.68^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`arch.ns.cloudflare.com`
NS	`lara.ns.cloudflare.com`
		A	2606:4700:50::adf5:3a80^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`lara.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c080^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`lara.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2080^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`lara.ns.cloudflare.com`
		A	108.162.192.128^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`lara.ns.cloudflare.com`
		A	172.64.32.128^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`lara.ns.cloudflare.com`
		A	173.245.58.128^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`lara.ns.cloudflare.com`
MX	`za-smtp-inbound-1.mimecast.co.za` ⭐
		A	41.74.193.201^{🇿🇦 MimecastSA41.74.193.0/24 Mimecast SA}
			PTR	`za-smtp-inbound-1.mimecast.co.za`
			PTR	`za-smtp-inbound-2.mimecast.co.za`
		A	41.74.193.210^{🇿🇦 MimecastSA41.74.193.0/24 Mimecast SA}
			PTR	`za-smtp-inbound-1.mimecast.co.za`
			PTR	`za-smtp-inbound-2.mimecast.co.za`
		A	41.74.197.201^{🇿🇦 MimecastSA41.74.196.0/22 Mimecast SA}
			PTR	`za-smtp-inbound-1.mimecast.co.za`
			PTR	`za-smtp-inbound-2.mimecast.co.za`
		A	41.74.197.210^{🇿🇦 MimecastSA41.74.196.0/22 Mimecast SA}
			PTR	`za-smtp-inbound-1.mimecast.co.za`
			PTR	`za-smtp-inbound-2.mimecast.co.za`
MX	`za-smtp-inbound-2.mimecast.co.za` ⭐
		A	41.74.193.201^{🇿🇦 MimecastSA41.74.193.0/24 Mimecast SA}
			PTR	`za-smtp-inbound-1.mimecast.co.za`
			PTR	`za-smtp-inbound-2.mimecast.co.za`
		A	41.74.193.210^{🇿🇦 MimecastSA41.74.193.0/24 Mimecast SA}
			PTR	`za-smtp-inbound-1.mimecast.co.za`
			PTR	`za-smtp-inbound-2.mimecast.co.za`
		A	41.74.197.201^{🇿🇦 MimecastSA41.74.196.0/22 Mimecast SA}
			PTR	`za-smtp-inbound-1.mimecast.co.za`
			PTR	`za-smtp-inbound-2.mimecast.co.za`
		A	41.74.197.210^{🇿🇦 MimecastSA41.74.196.0/22 Mimecast SA}
			PTR	`za-smtp-inbound-1.mimecast.co.za`
			PTR	`za-smtp-inbound-2.mimecast.co.za`
TXT	`0ed1fe018a72bd8f0d4a004d27a3193f355c12de7d`
TXT	`google-site-verification=xP8v6TsJqWANLxd-Q2ys16tEQfRhoyXddQJAATnr5y0`
TXT	`v=spf1 include:_spf.google.com include:za._netblocks.mimecast.com -all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.55.162, 172.67.149.50
		IPv6 hints	2606:4700:3032::ac43:9532, 2606:4700:3034::6815:37a2
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=153, name=cloudflare-ech.com
SOA	`arch.ns.cloudflare.com`dns@cloudflare.com serial=2408455002

`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=1783449386

Same first word

coursebook.org

coursebook.pl

coursebook.eu

coursebook.com

coursebook.net

coursebook.ru

coursebook.co.uk

coursebook.co.ke

coursebook.de

coursebook.ai

Similar names

DNS History

22 records (8 active, 14 former)

●NSarch.ns.cloudflare.com2026-07-07 → 2026-07-07 · 2 obs

○ 2017-07-05 14:07:36
● 2026-07-07 19:00:58

○NSbuy.internettraffic.com2015-06-05 → 2016-06-01 · 5 obs

○ 2008-03-19 20:21:02
● 2015-06-05 13:59:54
● 2016-06-01 11:43:04
○ 2016-12-15 14:43:46
○ 2026-07-07 19:00:58

●NSlara.ns.cloudflare.com2026-07-07 → 2026-07-07 · 2 obs

○ 2017-07-05 14:07:36
● 2026-07-07 19:00:58

○NSns1.15x.net2008-03-19 → 2008-03-19 · 3 obs

● 2008-03-19 20:21:02
○ 2015-06-05 13:59:54
○ 2026-07-07 19:00:58

○NSns1.uniregistrymarket.link2016-12-15 → 2017-07-05 · 4 obs

○ 2016-06-01 11:43:04
● 2016-12-15 14:43:46
● 2017-07-05 14:07:36
○ 2026-07-07 19:00:58

○NSns2.15x.net2008-03-19 → 2008-03-19 · 3 obs

● 2008-03-19 20:21:02
○ 2015-06-05 13:59:54
○ 2026-07-07 19:00:58

○NSns2.uniregistrymarket.link2016-12-15 → 2017-07-05 · 4 obs

○ 2016-06-01 11:43:04
● 2016-12-15 14:43:46
● 2017-07-05 14:07:36
○ 2026-07-07 19:00:58

○NSsell.internettraffic.com2015-06-05 → 2016-06-01 · 5 obs

○ 2008-03-19 20:21:02
● 2015-06-05 13:59:54
● 2016-06-01 11:43:04
○ 2016-12-15 14:43:46
○ 2026-07-07 19:00:58

●MXza-smtp-inbound-1.mimecast.co.za2026-07-07 → 2026-07-07 · 1 obs

● 2026-07-07 19:00:58

●MXza-smtp-inbound-2.mimecast.co.za2026-07-07 → 2026-07-07 · 1 obs

● 2026-07-07 19:00:58

●A104.21.55.1622026-07-07 → 2026-07-07 · 2 obs

○ 2017-07-05 14:07:36
● 2026-07-07 19:00:58

●A172.67.149.502026-07-07 → 2026-07-07 · 2 obs

○ 2017-07-05 14:07:36
● 2026-07-07 19:00:58

○A176.74.176.1872016-12-15 → 2017-07-05 · 4 obs

○ 2016-06-01 11:43:04
● 2016-12-15 14:43:46
● 2017-07-05 14:07:36
○ 2026-07-07 19:00:58

○A188.114.96.02026-07-07 → 2026-07-07 · 1 obs

○ 2026-07-07 19:00:58

○A188.114.97.02026-07-07 → 2026-07-07 · 1 obs

○ 2026-07-07 19:00:58

○A216.187.103.1692008-03-19 → 2008-03-19 · 3 obs

● 2008-03-19 20:21:02
○ 2015-06-05 13:59:54
○ 2026-07-07 19:00:58

●A2606:4700:3032::ac43:95322026-07-07 → 2026-07-07 · 2 obs

○ 2017-07-05 14:07:36
● 2026-07-07 19:00:58

●A2606:4700:3034::6815:37a22026-07-07 → 2026-07-07 · 2 obs

○ 2017-07-05 14:07:36
● 2026-07-07 19:00:58

○A2a06:98c1:3120::2026-07-07 → 2026-07-07 · 1 obs

○ 2026-07-07 19:00:58

○A2a06:98c1:3121::2026-07-07 → 2026-07-07 · 1 obs

○ 2026-07-07 19:00:58

○A69.172.201.1532016-06-01 → 2016-06-01 · 4 obs

○ 2016-03-21 19:00:50
● 2016-06-01 11:43:04
○ 2016-12-15 14:43:46
○ 2026-07-07 19:00:58

○A69.172.201.2082015-06-05 → 2016-03-21 · 5 obs

○ 2008-03-19 20:21:02
● 2015-06-05 13:59:54
● 2016-03-21 19:00:50
○ 2016-06-01 11:43:04
○ 2026-07-07 19:00:58

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
coursebook.com	lara.ns.cloudflare.com, arch.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.193.68

NS records: lara.ns.cloudflare.com, arch.ns.cloudflare.com

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 279ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.55.162, 172.67.149.50`
AAAA	2	`2606:4700:3034::6815:37a2, 2606:4700:3032::ac43:9532`
NS	2	`arch.ns.cloudflare.com, lara.ns.cloudflare.com`
MX	2	`za-smtp-inbound-1.mimecast.co.za (pri: 1, za-smtp-inbound-2.mimecast.co.za (pri: 1`
TXT	3	`0ed1fe018a72bd8f0d4a004d27a3193f355c12de, google-site-verification=xP8v6TsJqWANLxd...`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`arch.ns.cloudflare.com dns.cloudflare.co`

📌 Glue Records Collected

Total: 12

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

Analysis

IP Addresses

coursebook.com has four IP addresses: 104.21.55.162, 172.67.149.50, 2606:4700:3032::ac43:9532 and 2606:4700:3034::6815:37a2.

Among the host names that share IP numbers with coursebook.com are www.hc-xt.com, outsourced365.com, hotel-roua.ro and two others.

Name Servers

Two name servers handle the delegation for coursebook.com: arch.ns.cloudflare.com and lara.ns.cloudflare.com.

coursebook.com has the same name server delegation as a number of other domains, such as trendzonline.nl, theworkflowpro.com, crossfitvoices.com and two more.

coursebook.com shares at least some of its name servers with other domains, including 83.174.103.in-addr.arpa, rfsa.cn, streamingcommunityz.moe and two others.

These name servers are frequently seen alongside the name servers adel.ns.cloudflare.com.

Host names resolving to 6 IP numbers:

arch.ns.cloudflare.com resolves to 108.162.193.68, 172.64.33.68 and 173.245.59.68 among others, with 3 other IP addresses in total.

lara.ns.cloudflare.com resolves to 108.162.192.128, 172.64.32.128 and 173.245.58.128 among others, with 3 other IP addresses in total.

Mail Servers

The MX records for coursebook.com point to two mail servers: za-smtp-inbound-1.mimecast.co.za and za-smtp-inbound-2.mimecast.co.za.

coursebook.com has the same mail server arrangement as a number of other domains, for example sanlam.co.zm, khwelacity.co.za, ggda.co.za and two more.

coursebook.com shares at least some of its mail servers with other domains — for example kingpie.co.za, onepetstore.co.za, karingani.com and two more.

Both za-smtp-inbound-1.mimecast.co.za and za-smtp-inbound-2.mimecast.co.za resolve to four IP addresses: za-smtp-inbound-1.mimecast.co.za points to 41.74.193.201, 41.74.193.210, 41.74.197.201 and 41.74.197.210 while za-smtp-inbound-2.mimecast.co.za resolves to 41.74.193.201, 41.74.193.210, 41.74.197.201 and 41.74.197.210.

za-smtp-inbound-1.mimecast.co.za along with za-smtp-inbound-2.mimecast.co.za each resolve to 41.74.193.201 IP addresses.

za-smtp-inbound-1.mimecast.co.za along with za-smtp-inbound-2.mimecast.co.za each resolve to 41.74.193.210 IP addresses.

za-smtp-inbound-1.mimecast.co.za along with za-smtp-inbound-2.mimecast.co.za each resolve to 41.74.197.201 IP addresses.

za-smtp-inbound-1.mimecast.co.za along with za-smtp-inbound-2.mimecast.co.za each resolve to 41.74.197.210 IP addresses.