21sci.com - dns.ninja

`21sci.com`

DNSSEC	⚠️ Not signed
A	2606:4700:3036::ac43:c551^{🇺🇸 Cloudflare2606:4700:3036::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3037::6815:1557^{🇺🇸 Cloudflare2606:4700:3037::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.21.87^{Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.197.81^{🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`carl.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3b6a^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`carl.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c16a^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`carl.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:216a^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`carl.ns.cloudflare.com`
		A	108.162.193.106^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`carl.ns.cloudflare.com`
		A	172.64.33.106^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`carl.ns.cloudflare.com`
		A	173.245.59.106^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`carl.ns.cloudflare.com`
NS	`mckenzie.ns.cloudflare.com`
		A	2606:4700:50::a29f:26fd^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`mckenzie.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c2fd^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`mckenzie.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:22fd^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`mckenzie.ns.cloudflare.com`
		A	108.162.194.253^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`mckenzie.ns.cloudflare.com`
		A	162.159.38.253^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`mckenzie.ns.cloudflare.com`
		A	172.64.34.253^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`mckenzie.ns.cloudflare.com`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.21.87, 172.67.197.81
		IPv6 hints	2606:4700:3036::ac43:c551, 2606:4700:3037::6815:1557
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=154, name=cloudflare-ech.com
SOA	`carl.ns.cloudflare.com`dns@cloudflare.com serial=2411647738

`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=1786583484

Subdomains

www.21sci.com

Same first word

21sci.com

Similar names

21csi.com

cis21.com

isc21.com

isc21.co.jp

ics21.com

sci21.com

sic21.ro

21cis.net

isc21.kr

isc21.jp

DNS History

20 records (6 active, 14 former)

●NScarl.ns.cloudflare.com2026-02-23 → 2026-08-13 · 3 obs

○ 2017-05-30 23:12:34
● 2026-02-23 19:04:16
● 2026-08-13 01:37:34

●NSmckenzie.ns.cloudflare.com2026-02-23 → 2026-08-13 · 3 obs

○ 2017-05-30 23:12:34
● 2026-02-23 19:04:16
● 2026-08-13 01:37:34

○NSns11.xincache.com2015-05-27 → 2015-05-27 · 3 obs

● 2015-05-27 12:23:20
○ 2015-11-02 11:16:46
○ 2026-08-13 01:37:34

○NSns12.xincache.com2015-05-27 → 2015-05-27 · 3 obs

● 2015-05-27 12:23:20
○ 2015-11-02 11:16:46
○ 2026-08-13 01:37:34

○NSns13.xincache.com2015-11-02 → 2017-05-30 · 5 obs

○ 2015-05-27 12:23:20
● 2015-11-02 11:16:46
● 2017-05-30 23:12:34
○ 2026-02-23 19:04:16
○ 2026-08-13 01:37:34

○NSns14.xincache.com2015-11-02 → 2017-05-30 · 5 obs

○ 2015-05-27 12:23:20
● 2015-11-02 11:16:46
● 2017-05-30 23:12:34
○ 2026-02-23 19:04:16
○ 2026-08-13 01:37:34

○MXmxbiz1.qq.com2015-05-27 → 2017-05-30 · 4 obs

● 2015-05-27 12:23:20
● 2017-05-30 23:12:34
○ 2026-02-23 19:04:16
○ 2026-08-13 01:37:34

○MXmxbiz2.qq.com2015-05-27 → 2017-05-30 · 4 obs

● 2015-05-27 12:23:20
● 2017-05-30 23:12:34
○ 2026-02-23 19:04:16
○ 2026-08-13 01:37:34

●A104.21.21.872026-04-09 → 2026-08-13 · 15 obs

○ 2026-02-23 19:04:16
○ 2026-03-06 08:18:36
● 2026-04-09 08:41:10
○ 2026-04-11 08:48:54
○ 2026-04-25 11:44:26
● 2026-05-03 04:48:26
● 2026-05-04 14:04:48
○ 2026-05-11 06:00:02
○ 2026-06-02 07:58:32
● 2026-06-14 02:45:32
● 2026-06-18 09:25:56
○ 2026-06-22 18:52:26
● 2026-07-04 02:20:02
○ 2026-07-07 18:41:18
● 2026-08-13 01:37:34

○A106.75.45.222016-08-20 → 2017-05-30 · 5 obs

○ 2016-08-12 10:42:02
● 2016-08-20 01:32:38
● 2017-05-30 23:12:34
○ 2026-02-23 19:04:16
○ 2026-08-13 01:37:34

●A172.67.197.812026-04-09 → 2026-08-13 · 15 obs

○A188.114.96.02026-02-23 → 2026-07-07 · 16 obs

○ 2017-05-30 23:12:34
● 2026-02-23 19:04:16
● 2026-03-06 08:18:36
○ 2026-04-09 08:41:10
● 2026-04-11 08:48:54
● 2026-04-25 11:44:26
○ 2026-05-03 04:48:26
○ 2026-05-04 14:04:48
● 2026-05-11 06:00:02
● 2026-06-02 07:58:32
○ 2026-06-14 02:45:32
○ 2026-06-18 09:25:56
● 2026-06-22 18:52:26
○ 2026-07-04 02:20:02
● 2026-07-07 18:41:18
○ 2026-08-13 01:37:34

○A188.114.97.02026-02-23 → 2026-07-07 · 16 obs

○A2606:4700:3031::ac43:c5512026-04-09 → 2026-06-18 · 13 obs

○A2606:4700:3034::6815:15572026-04-09 → 2026-06-18 · 13 obs

●A2606:4700:3036::ac43:c5512026-07-04 → 2026-08-13 · 4 obs

○ 2026-06-22 18:52:26
● 2026-07-04 02:20:02
○ 2026-07-07 18:41:18
● 2026-08-13 01:37:34

●A2606:4700:3037::6815:15572026-07-04 → 2026-08-13 · 4 obs

○ 2026-06-22 18:52:26
● 2026-07-04 02:20:02
○ 2026-07-07 18:41:18
● 2026-08-13 01:37:34

○A2a06:98c1:3120::2026-02-23 → 2026-07-07 · 16 obs

○A2a06:98c1:3121::2026-02-23 → 2026-07-07 · 16 obs

○A42.62.26.602015-05-27 → 2016-08-12 · 4 obs

● 2015-05-27 12:23:20
● 2016-08-12 10:42:02
○ 2016-08-20 01:32:38
○ 2026-08-13 01:37:34

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	e.gtld-servers.net, d.gtld-servers.net, j.gtld-servers.net, b.gtld-servers.net...	-
21sci.com	carl.ns.cloudflare.com, mckenzie.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.194.253

NS records: carl.ns.cloudflare.com, mckenzie.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

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

⏱️ Timing

Total: 146ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.21.87, 172.67.197.81`
AAAA	2	`2606:4700:3036::ac43:c551, 2606:4700:3037::6815:1557`
NS	2	`carl.ns.cloudflare.com, mckenzie.ns.cloudflare.com`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`carl.ns.cloudflare.com dns.cloudflare.co`

📌 Glue Records Collected

Total: 12

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

Analysis

Hierarchy

21sci.com is the parent zone for www.21sci.com.

IP Addresses

21sci.com has four IP addresses: 104.21.21.87, 172.67.197.81, 2606:4700:3036::ac43:c551 and 2606:4700:3037::6815:1557.

df.sk, holed.net, voiceprint.global plus two other host names have IP numbers in common with 21sci.com.

Name Servers

Two name servers handle the delegation for 21sci.com: carl.ns.cloudflare.com and mckenzie.ns.cloudflare.com.

The name server configuration of 21sci.com is shared with other domains, for instance palmpavilion.net, pingziloveshare.com, tombraiderlegend.com and two others.

21sci.com partially shares its NS delegation with several other domains, including tech-biztech.com, khokchan.go.th, zraswaricz.info and two others.

These name servers often co-occur with the name servers adi.ns.cloudflare.com.

Hosts with 6 IP addresses each:

carl.ns.cloudflare.com resolves to 108.162.193.106, 172.64.33.106 and 173.245.59.106 among others, with 3 other IP addresses in total.

mckenzie.ns.cloudflare.com resolves to 108.162.194.253, 162.159.38.253 and 172.64.34.253 among others, with 3 other IP addresses in total.