`21dcedu.com`

DNSSEC	⚠️ Not signed
A	2606:4700:3033::6815:4732^{🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3035::ac43:a97c^{🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.71.50^{Cloudflare104.21.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.169.124^{🇺🇸 Cloudflare172.67.160.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`autumn.ns.cloudflare.com` ⭐
		A	2606:4700:50::a29f:2694^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`autumn.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c294^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`autumn.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2294^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`autumn.ns.cloudflare.com`
		A	108.162.194.148^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`autumn.ns.cloudflare.com`
		A	162.159.38.148^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`autumn.ns.cloudflare.com`
		A	172.64.34.148^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`autumn.ns.cloudflare.com`
NS	`chance.ns.cloudflare.com`
		A	2606:4700:58::a29f:2c21^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`chance.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c321^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`chance.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2321^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`chance.ns.cloudflare.com`
		A	108.162.195.33^{🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`chance.ns.cloudflare.com`
		A	162.159.44.33^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`chance.ns.cloudflare.com`
		A	172.64.35.33^{🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`chance.ns.cloudflare.com`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4	104.21.71.50, 172.67.169.124
		IPv6	2606:4700:3033::6815:4732, 2606:4700:3035::ac43:a97c
SOA	`autumn.ns.cloudflare.com`dns@cloudflare.com serial=2398967915

`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=1774505977

Previously MX for

21dcedu.com

Same first word

21dcedu.com

DNS History

20 records (6 active, 14 former)

●NSautumn.ns.cloudflare.com2026-03-07 → 2026-03-26 · 3 obs

○ 2017-05-18 05:33:40
● 2026-03-07 02:02:54
● 2026-03-26 06:22:56

●NSchance.ns.cloudflare.com2026-03-07 → 2026-03-26 · 3 obs

○ 2017-05-18 05:33:40
● 2026-03-07 02:02:54
● 2026-03-26 06:22:56

○NSn358.ns.yunjiasu.com2015-10-22 → 2017-05-18 · 5 obs

○ 2015-05-21 22:25:32
● 2015-10-22 16:09:20
● 2017-05-18 05:33:40
○ 2026-03-07 02:02:54
○ 2026-03-26 06:22:56

○NSn3599.ns.yunjiasu.com2015-10-22 → 2017-05-18 · 5 obs

○ 2015-05-21 22:25:32
● 2015-10-22 16:09:20
● 2017-05-18 05:33:40
○ 2026-03-07 02:02:54
○ 2026-03-26 06:22:56

○NSns13.xincache.com2015-05-21 → 2015-05-21 · 3 obs

● 2015-05-21 22:25:32
○ 2015-10-22 16:09:20
○ 2026-03-26 06:22:56

○NSns14.xincache.com2015-05-21 → 2015-05-21 · 3 obs

● 2015-05-21 22:25:32
○ 2015-10-22 16:09:20
○ 2026-03-26 06:22:56

○MX21dcedu.com2017-05-18 → 2017-05-18 · 4 obs

○ 2016-11-19 18:23:26
● 2017-05-18 05:33:40
○ 2026-03-07 02:02:54
○ 2026-03-26 06:22:56

○MXdc-14d0912c.21dcedu.com2015-10-22 → 2016-11-19 · 4 obs

● 2015-10-22 16:09:20
● 2016-11-19 18:23:26
○ 2017-05-18 05:33:40
○ 2026-03-26 06:22:56

●A104.21.71.502026-03-07 → 2026-03-26 · 3 obs

○ 2017-05-18 05:33:40
● 2026-03-07 02:02:54
● 2026-03-26 06:22:56

○A108.162.194.2522016-01-02 → 2016-01-02 · 4 obs

○ 2015-10-22 16:09:20
● 2016-01-02 20:54:08
○ 2016-04-09 19:05:08
○ 2026-03-26 06:22:56

○A108.162.195.2522016-01-02 → 2016-01-02 · 4 obs

○ 2015-10-22 16:09:20
● 2016-01-02 20:54:08
○ 2016-04-09 19:05:08
○ 2026-03-26 06:22:56

○A122.114.17.172015-05-21 → 2015-05-21 · 3 obs

● 2015-05-21 22:25:32
○ 2015-10-22 16:09:20
○ 2026-03-26 06:22:56

○A122.114.17.52017-05-18 → 2017-05-18 · 4 obs

○ 2016-11-19 18:23:26
● 2017-05-18 05:33:40
○ 2026-03-07 02:02:54
○ 2026-03-26 06:22:56

○A162.159.210.502016-04-09 → 2016-11-19 · 5 obs

○ 2016-01-02 20:54:08
● 2016-04-09 19:05:08
● 2016-11-19 18:23:26
○ 2017-05-18 05:33:40
○ 2026-03-26 06:22:56

○A162.159.211.502016-04-09 → 2016-11-19 · 5 obs

○ 2016-01-02 20:54:08
● 2016-04-09 19:05:08
● 2016-11-19 18:23:26
○ 2017-05-18 05:33:40
○ 2026-03-26 06:22:56

●A172.67.169.1242026-03-07 → 2026-03-26 · 3 obs

○ 2017-05-18 05:33:40
● 2026-03-07 02:02:54
● 2026-03-26 06:22:56

○A199.27.134.1482015-10-22 → 2015-10-22 · 4 obs

○ 2015-05-21 22:25:32
● 2015-10-22 16:09:20
○ 2016-01-02 20:54:08
○ 2026-03-26 06:22:56

○A199.27.135.1482015-10-22 → 2015-10-22 · 4 obs

○ 2015-05-21 22:25:32
● 2015-10-22 16:09:20
○ 2016-01-02 20:54:08
○ 2026-03-26 06:22:56

●A2606:4700:3033::6815:47322026-03-07 → 2026-03-26 · 3 obs

○ 2017-05-18 05:33:40
● 2026-03-07 02:02:54
● 2026-03-26 06:22:56

●A2606:4700:3035::ac43:a97c2026-03-07 → 2026-03-26 · 3 obs

○ 2017-05-18 05:33:40
● 2026-03-07 02:02:54
● 2026-03-26 06:22:56

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
21dcedu.com	autumn.ns.cloudflare.com, chance.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:162.159.38.148

NS records: autumn.ns.cloudflare.com, chance.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

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

⏱️ Timing

Total: 116ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.169.124, 104.21.71.50`
AAAA	2	`2606:4700:3033::6815:4732, 2606:4700:3035::ac43:a97c`
NS	2	`autumn.ns.cloudflare.com, chance.ns.cloudflare.com`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`autumn.ns.cloudflare.com dns.cloudflare.`

📌 Glue Records Collected

Total: 12

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

Analysis

IP Addresses

Four IP numbers are pointed to by 21dcedu.com: 2606:4700:3033::6815:4732, 2606:4700:3035::ac43:a97c, 104.21.71.50 and 172.67.169.124.

other host names including tiedcuffed.com, sochi-cityplaza.ru, timnathgov.com, generationkia.com and ns4.tenten.vn.vietcom.edu.vn share IP numbers with 21dcedu.com.

Name Servers

21dcedu.com is delegated to two name servers autumn.ns.cloudflare.com and chance.ns.cloudflare.com.

21dcedu.com shares the same name server setup as other domains, for instance 21zkv.com, cpsdiesel.com, xjc8.com, furenmeng.com and waoidc.com.

21dcedu.com at least partially shares name servers with other domains, for instance (0x616e616c)photo.ru, imjkt.com, arslinux.com, shanxingheshi.com and whiskyshop.com.

These name servers are commonly used alongside felipe.ns.cloudflare.com and hera.ns.cloudflare.com.

Host names with six IP numbers:

Host name autumn.ns.cloudflare.com points to: 2606:4700:50::a29f:2694, 2803:f800:50::6ca2:c294, 2a06:98c1:50::ac40:2294, 108.162.194.148, 162.159.38.148 and 172.64.34.148.

Host name chance.ns.cloudflare.com points to: 2606:4700:58::a29f:2c21, 2803:f800:50::6ca2:c321, 2a06:98c1:50::ac40:2321, 108.162.195.33, 162.159.44.33 and 172.64.35.33.

21dcedu.com - robtex.com

21dcedu.com

com

Previously MX for

Same first word

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

📌 Glue Records Collected

Analysis

IP Addresses

Name Servers

`21dcedu.com`

`com`