21knowledge.com - dns.ninja

`21knowledge.com`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::ac43:966d^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3031::6815:1e18^{🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.30.24^{Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.150.109^{🇺🇸 Cloudflare172.67.144.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`bailey.ns.cloudflare.com` ⭐
		A	2606:4700:50::a29f:2629^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`bailey.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c229^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`bailey.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2229^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`bailey.ns.cloudflare.com`
		A	108.162.194.41^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`bailey.ns.cloudflare.com`
		A	162.159.38.41^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`bailey.ns.cloudflare.com`
		A	172.64.34.41^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`bailey.ns.cloudflare.com`
NS	`glen.ns.cloudflare.com`
		A	2606:4700:58::adf5:3ba9^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`glen.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c1a9^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`glen.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:21a9^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`glen.ns.cloudflare.com`
		A	108.162.193.169^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`glen.ns.cloudflare.com`
		A	172.64.33.169^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`glen.ns.cloudflare.com`
		A	173.245.59.169^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`glen.ns.cloudflare.com`
MX	`mx2.zoho.com` ⭐
		A	136.143.183.44^{🇺🇸 ZohoAS136.143.182.0/23 Zoho}
			PTR	`mx2.zoho.com`
			PTR	`mx3.zoho.com`
			PTR	`mx.zoho.com`
			PTR	`mx2.zohomail.com`
			PTR	`mx3.zohomail.com`
			PTR	`mx.zohomail.com`
MX	`mx3.zoho.com`⁽²⁰⁾
		A	204.141.43.44^{🇺🇸 ZohoAS204.141.42.0/23 Zoho Corporation}
			PTR	`mx2.zoho.com`
			PTR	`mx3.zoho.com`
			PTR	`mx6.zoho.com`
			PTR	`mx7.zoho.com`
			PTR	`mx8.zoho.com`
			PTR	`mx.zoho.com`
			PTR	`mx2.zohomail.com`
			PTR	`mx3.zohomail.com`
			PTR	`mx.zohomail.com`
MX	`mx.zoho.com`⁽⁵⁰⁾
		A	204.141.43.44^{🇺🇸 ZohoAS204.141.42.0/23 Zoho Corporation}
			PTR	`mx2.zoho.com`
			PTR	`mx3.zoho.com`
			PTR	`mx6.zoho.com`
			PTR	`mx7.zoho.com`
			PTR	`mx8.zoho.com`
			PTR	`mx.zoho.com`
			PTR	`mx2.zohomail.com`
			PTR	`mx3.zohomail.com`
			PTR	`mx.zohomail.com`
TXT	`google-site-verification=1IxujwpjmywiaQoJ0dMBQ8kjZeiwpNcevFhI1tluw3Q`
TXT	`google-site-verification=JrPcMKrHMfIUqwPv74lTGvqPaCDJmyvs8PKLQbypreQ`
TXT	`v=spf1 include:zoho.com ~all`
TXT	`zoho-verification=zb46770202.zmverify.zoho.com`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.30.24, 172.67.150.109
		IPv6 hints	2606:4700:3030::ac43:966d, 2606:4700:3031::6815:1e18
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=109, name=cloudflare-ech.com
SOA	`bailey.ns.cloudflare.com`dns@cloudflare.com serial=2409653405

`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=1785536377

Same first word

21knowledge.com

Similar names

knowledge21.com

DNS History

30 records (9 active, 21 former)

●NSbailey.ns.cloudflare.com2026-02-27 → 2026-07-31 · 3 obs

○ 2018-08-22 00:52:20
● 2026-02-27 13:50:48
● 2026-07-31 22:45:32

●NSglen.ns.cloudflare.com2026-02-27 → 2026-07-31 · 3 obs

○ 2018-08-22 00:52:20
● 2026-02-27 13:50:48
● 2026-07-31 22:45:32

○NSns1.21knowledge.com2016-12-30 → 2016-12-30 · 4 obs

○ 2016-04-21 21:31:32
● 2016-12-30 19:46:50
○ 2018-08-22 00:52:20
○ 2026-07-31 22:45:32

○NSns151.ehosts.com2016-04-21 → 2016-04-21 · 4 obs

○ 2016-01-27 12:42:00
● 2016-04-21 21:31:32
○ 2016-12-30 19:46:50
○ 2026-07-31 22:45:32

○NSns152.ehosts.com2016-04-21 → 2016-04-21 · 4 obs

○ 2016-01-27 12:42:00
● 2016-04-21 21:31:32
○ 2016-12-30 19:46:50
○ 2026-07-31 22:45:32

○NSns1dhq.name.com2015-07-05 → 2016-01-27 · 4 obs

● 2015-07-05 17:41:08
● 2016-01-27 12:42:00
○ 2016-04-21 21:31:32
○ 2026-07-31 22:45:32

○NSns2.21knowledge.com2016-12-30 → 2016-12-30 · 4 obs

○ 2016-04-21 21:31:32
● 2016-12-30 19:46:50
○ 2018-08-22 00:52:20
○ 2026-07-31 22:45:32

○NSns2dfg.name.com2015-07-05 → 2016-01-27 · 4 obs

● 2015-07-05 17:41:08
● 2016-01-27 12:42:00
○ 2016-04-21 21:31:32
○ 2026-07-31 22:45:32

○NSns3jmt.name.com2015-07-05 → 2016-01-27 · 4 obs

● 2015-07-05 17:41:08
● 2016-01-27 12:42:00
○ 2016-04-21 21:31:32
○ 2026-07-31 22:45:32

○NSns4dfh.name.com2015-07-05 → 2016-01-27 · 4 obs

● 2015-07-05 17:41:08
● 2016-01-27 12:42:00
○ 2016-04-21 21:31:32
○ 2026-07-31 22:45:32

○MX21knowledge-com.mail.protection.outlook.com2015-07-05 → 2016-01-27 · 4 obs

● 2015-07-05 17:41:08
● 2016-01-27 12:42:00
○ 2016-04-21 21:31:32
○ 2026-07-31 22:45:32

○MXmail.21knowledge.com2016-12-30 → 2016-12-30 · 4 obs

○ 2016-04-21 21:31:32
● 2016-12-30 19:46:50
○ 2018-08-22 00:52:20
○ 2026-07-31 22:45:32

●MXmx.zoho.com2026-02-27 → 2026-07-31 · 3 obs

○ 2018-08-22 00:52:20
● 2026-02-27 13:50:48
● 2026-07-31 22:45:32

●MXmx2.zoho.com2026-02-27 → 2026-07-31 · 3 obs

○ 2018-08-22 00:52:20
● 2026-02-27 13:50:48
● 2026-07-31 22:45:32

○MXmx3.name.com2016-04-21 → 2016-04-21 · 4 obs

○ 2016-01-27 12:42:00
● 2016-04-21 21:31:32
○ 2016-12-30 19:46:50
○ 2026-07-31 22:45:32

●MXmx3.zoho.com2026-02-27 → 2026-07-31 · 3 obs

○ 2018-08-22 00:52:20
● 2026-02-27 13:50:48
● 2026-07-31 22:45:32

○MXmx4.name.com2016-04-21 → 2016-04-21 · 4 obs

○ 2016-01-27 12:42:00
● 2016-04-21 21:31:32
○ 2016-12-30 19:46:50
○ 2026-07-31 22:45:32

○MXmx5.name.com2016-04-21 → 2016-04-21 · 4 obs

○ 2016-01-27 12:42:00
● 2016-04-21 21:31:32
○ 2016-12-30 19:46:50
○ 2026-07-31 22:45:32

○MXmx6.name.com2016-04-21 → 2016-04-21 · 4 obs

○ 2016-01-27 12:42:00
● 2016-04-21 21:31:32
○ 2016-12-30 19:46:50
○ 2026-07-31 22:45:32

○MXmx7.name.com2016-04-21 → 2016-04-21 · 4 obs

○ 2016-01-27 12:42:00
● 2016-04-21 21:31:32
○ 2016-12-30 19:46:50
○ 2026-07-31 22:45:32

○MXmx8.name.com2016-04-21 → 2016-04-21 · 4 obs

○ 2016-01-27 12:42:00
● 2016-04-21 21:31:32
○ 2016-12-30 19:46:50
○ 2026-07-31 22:45:32

●A104.21.30.242026-02-27 → 2026-07-31 · 3 obs

○ 2018-08-22 00:52:20
● 2026-02-27 13:50:48
● 2026-07-31 22:45:32

○A108.167.137.332016-04-21 → 2016-04-21 · 4 obs

○ 2016-01-27 12:42:00
● 2016-04-21 21:31:32
○ 2016-12-30 19:46:50
○ 2026-07-31 22:45:32

○A109.73.239.1682015-07-05 → 2016-01-27 · 4 obs

● 2015-07-05 17:41:08
● 2016-01-27 12:42:00
○ 2016-04-21 21:31:32
○ 2026-07-31 22:45:32

○A158.69.112.952016-12-30 → 2016-12-30 · 4 obs

○ 2016-04-21 21:31:32
● 2016-12-30 19:46:50
○ 2018-08-22 00:52:20
○ 2026-07-31 22:45:32

●A172.67.150.1092026-02-27 → 2026-07-31 · 3 obs

○ 2018-08-22 00:52:20
● 2026-02-27 13:50:48
● 2026-07-31 22:45:32

●A2606:4700:3030::ac43:966d2026-07-01 → 2026-07-31 · 3 obs

○ 2026-02-27 13:50:48
● 2026-07-01 21:09:22
● 2026-07-31 22:45:32

●A2606:4700:3031::6815:1e182026-07-01 → 2026-07-31 · 3 obs

○ 2026-02-27 13:50:48
● 2026-07-01 21:09:22
● 2026-07-31 22:45:32

○A2606:4700:3033::6815:1e182026-02-27 → 2026-02-27 · 4 obs

○ 2018-08-22 00:52:20
● 2026-02-27 13:50:48
○ 2026-07-01 21:09:22
○ 2026-07-31 22:45:32

○A2606:4700:3035::ac43:966d2026-02-27 → 2026-02-27 · 4 obs

○ 2018-08-22 00:52:20
● 2026-02-27 13:50:48
○ 2026-07-01 21:09:22
○ 2026-07-31 22:45:32

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	b.gtld-servers.net, m.gtld-servers.net, k.gtld-servers.net, a.gtld-servers.net...	-
21knowledge.com	glen.ns.cloudflare.com, bailey.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.193.169

NS records: glen.ns.cloudflare.com, bailey.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for 21knowledge.com (unsigned zone)

⏱️ Timing

Total: 391ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.150.109, 104.21.30.24`
AAAA	2	`2606:4700:3031::6815:1e18, 2606:4700:3030::ac43:966d`
NS	2	`bailey.ns.cloudflare.com, glen.ns.cloudflare.com`
MX	3	`mx.zoho.com (pri: 10), mx2.zoho.com (pri: 20)...`
TXT	4	`google-site-verification=1IxujwpjmywiaQo, google-site-verification=JrPcMKrHMfIUqwP...`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`bailey.ns.cloudflare.com dns.cloudflare.`

📌 Glue Records Collected

Total: 12

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

Analysis

IP Addresses

21knowledge.com has four IP addresses: 104.21.30.24, 172.67.150.109, 2606:4700:3030::ac43:966d and 2606:4700:3031::6815:1e18.

www.total.com.cn.cdn.cloudflare.net, feed.chimukappa.com, enduringheartsclub.com and two other host names share IP numbers with 21knowledge.com.

Name Servers

Two name servers handle the delegation for 21knowledge.com: bailey.ns.cloudflare.com and glen.ns.cloudflare.com.

21knowledge.com uses the same name servers as several other domains — among them fedweek.com, formanacupuncture.com, wildjackcasino.se and two more.

21knowledge.com partially shares its NS delegation with several other domains, including distyn.com, uk-hotel.info, raportinformacyjnyzone.biz and two others.

These name servers are regularly seen alongside jaime.ns.cloudflare.com and walk.ns.cloudflare.com as name servers.

Hostnames that resolve to 6 IP addresses:

bailey.ns.cloudflare.com resolves to 108.162.194.41, 162.159.38.41 and 172.64.34.41 among others, with 3 other IP addresses in total.

glen.ns.cloudflare.com resolves to 108.162.193.169, 172.64.33.169 and 173.245.59.169 among others, with 3 other IP addresses in total.

Mail Servers

21knowledge.com uses three mail servers — mx2.zoho.com, mx3.zoho.com and mx.zoho.com.

21knowledge.com has at least partial mail server overlap with other domains such as awesell.com, codileyes.com, hackrosoft.com.mx and two more.

Each of mx2.zoho.com, mx3.zoho.com and mx.zoho.com resolves to one IP address: mx2.zoho.com to 136.143.183.44, and both mx3.zoho.com and mx.zoho.com to 204.141.43.44.

mx3.zoho.com along with mx.zoho.com each resolve to 204.141.43.44 IP addresses.