🛡️Domain Reputation CheckBlocklist, phishing & malware status→

`teachstack.org`

DNSSEC	🔒 Signed (DS record present)
A	2606:50c0:8000::153^{🇺🇸 Fastly2606:50c0:8000::/48 88 Colin P Kelly Jr Street San Francisco CA 94107 United States}
A	2606:50c0:8001::153^{🇺🇸 Fastly2606:50c0:8001::/48 + 88 Colin P Kelly Jr Street San Francisco CA 94107 United States}
A	2606:50c0:8002::153^{🇺🇸 Fastly2606:50c0:8002::/48 + 88 Colin P Kelly Jr Street San Francisco CA 94107 United States}
A	2606:50c0:8003::153^{🇺🇸 Fastly2606:50c0:8003::/48 + 88 Colin P Kelly Jr Street San Francisco CA 94107 United States}
A	185.199.108.153^{🇺🇸 Fastly185.199.108.0/24 GitHub - 185.199.108.0/24}
A	185.199.109.153^{🇺🇸 Fastly185.199.109.0/24 GitHub - 185.199.109.0/24}
A	185.199.110.153^{🇺🇸 Fastly185.199.110.0/24 GitHub - 185.199.110.0/24}
A	185.199.111.153^{🇺🇸 Fastly185.199.111.0/24 GitHub - 185.199.111.0/24}
NS	`cortney.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3a57^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`cortney.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c057^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`cortney.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2057^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`cortney.ns.cloudflare.com`
		A	108.162.192.87^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`cortney.ns.cloudflare.com`
		A	172.64.32.87^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`cortney.ns.cloudflare.com`
		A	173.245.58.87^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`cortney.ns.cloudflare.com`
NS	`paul.ns.cloudflare.com`
		A	2606:4700:58::adf5:3b87^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`paul.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c187^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`paul.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2187^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`paul.ns.cloudflare.com`
		A	108.162.193.135^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`paul.ns.cloudflare.com`
		A	172.64.33.135^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`paul.ns.cloudflare.com`
		A	173.245.59.135^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`paul.ns.cloudflare.com`
MX	`route1.mx.cloudflare.net` ⭐
		A	2606:4700:f5::b^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	2606:4700:f5::c^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	2606:4700:f5::d^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.11^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.12^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.13^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
MX	`route2.mx.cloudflare.net`⁽⁹⁴⁾
		A	2606:4700:f5::e^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	2606:4700:f5::f^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	2606:4700:f5::10^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.17^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.18^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.19^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
MX	`route3.mx.cloudflare.net`⁽⁹⁹⁾
		A	2606:4700:f5::11^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	2606:4700:f5::12^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	2606:4700:f5::13^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.23^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.24^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.25^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
TXT	`v=spf1 include:_spf.mx.cloudflare.net ~all`
SOA	`cortney.ns.cloudflare.com`dns@cloudflare.com serial=2413845744

`org`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a0.org.afilias-nst.info` ⭐ ⚠️ Not in parent delegation
	NS	`a2.org.afilias-nst.info` ⚠️ Not in parent delegation
	NS	`b0.org.afilias-nst.org`
	NS	`b2.org.afilias-nst.org`
	NS	`c0.org.afilias-nst.info` ⚠️ Not in parent delegation
	NS	`d0.org.afilias-nst.org`
	SOA	`a0.org.afilias-nst.info`hostmaster@donuts.email serial=1788741919

Same first word

teachstack.io

teachstack.in

teachstack.org

Similar names

sacktheact.ph

echtstaack.de

casketchat.xyz

stackcheat.xyz

casketchat.com

cheatstack.com

sattacheck.in

stackatech.com

chatcasket.xyz

stackteach.com

etchastack.com

cheatstack.io

catchstake.xyz

Previous names

Next names

DNS History

13 records (13 active, 0 former)

●NScortney.ns.cloudflare.com2026-09-05 → 2026-09-07 · 2 obs

● 2026-09-05 11:16:40
● 2026-09-07 01:32:04

●NSpaul.ns.cloudflare.com2026-09-05 → 2026-09-07 · 2 obs

● 2026-09-05 11:16:40
● 2026-09-07 01:32:04

●MXroute1.mx.cloudflare.net2026-09-05 → 2026-09-07 · 2 obs

● 2026-09-05 11:16:40
● 2026-09-07 01:32:04

●MXroute2.mx.cloudflare.net2026-09-05 → 2026-09-07 · 2 obs

● 2026-09-05 11:16:40
● 2026-09-07 01:32:04

●MXroute3.mx.cloudflare.net2026-09-05 → 2026-09-07 · 2 obs

● 2026-09-05 11:16:40
● 2026-09-07 01:32:04

●A185.199.108.1532026-09-05 → 2026-09-07 · 2 obs

● 2026-09-05 11:16:40
● 2026-09-07 01:32:04

●A185.199.109.1532026-09-05 → 2026-09-07 · 2 obs

● 2026-09-05 11:16:40
● 2026-09-07 01:32:04

●A185.199.110.1532026-09-05 → 2026-09-07 · 2 obs

● 2026-09-05 11:16:40
● 2026-09-07 01:32:04

●A185.199.111.1532026-09-05 → 2026-09-07 · 2 obs

● 2026-09-05 11:16:40
● 2026-09-07 01:32:04

●A2606:50c0:8000::1532026-09-05 → 2026-09-07 · 2 obs

● 2026-09-05 11:16:40
● 2026-09-07 01:32:04

●A2606:50c0:8001::1532026-09-05 → 2026-09-07 · 2 obs

● 2026-09-05 11:16:40
● 2026-09-07 01:32:04

●A2606:50c0:8002::1532026-09-05 → 2026-09-07 · 2 obs

● 2026-09-05 11:16:40
● 2026-09-07 01:32:04

●A2606:50c0:8003::1532026-09-05 → 2026-09-07 · 2 obs

● 2026-09-05 11:16:40
● 2026-09-07 01:32:04

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
org	b2.org.afilias-nst.org, b0.org.afilias-nst.org, d0.org.afilias-nst.org	-
teachstack.org	paul.ns.cloudflare.com, cortney.ns.cloudflare.com	-

✅ Authoritative Response

Server:108.162.193.135

NS records: paul.ns.cloudflare.com, cortney.ns.cloudflare.com

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 534ms | Queries: -

📄 Records

Type	Count	Sample Data
A	4	`185.199.111.153, 185.199.109.153...`
AAAA	4	`2606:50c0:8003::153, 2606:50c0:8002::153...`
NS	2	`cortney.ns.cloudflare.com, paul.ns.cloudflare.com`
MX	3	`route1.mx.cloudflare.net (pri: 45), route2.mx.cloudflare.net (pri: 94)...`
TXT	1	`v=spf1 include:_spf.mx.cloudflare.net ~a`
SOA	1	`cortney.ns.cloudflare.com dns.cloudflare`

Analysis

IP Addresses

teachstack.org resolves to 8 IP numbers: 185.199.108.153, 185.199.109.153, 185.199.110.153 and 5 other.

Additional host names — givingtreeaz.org, xtal.club, elsontran.com and two others — share IP numbers with teachstack.org.

Name Servers

teachstack.org uses two name servers for its delegation: cortney.ns.cloudflare.com and paul.ns.cloudflare.com.

teachstack.org shares its name server setup with other domains, including oneflow.click, scalderwood.workers.dev, pasboy.ggff.net and two others.

There is at least partial name server overlap between teachstack.org and other domains — truerate.us, play8provider.com, a1400.com and two more among them.

These name servers are routinely deployed together with the name servers nova.ns.cloudflare.com.

Host names with 6 IP numbers:

Hostname cortney.ns.cloudflare.com directs to 108.162.192.87, 172.64.32.87 and 173.245.58.87 along with 3 other IP addresses.

Hostname paul.ns.cloudflare.com directs to 108.162.193.135, 172.64.33.135 and 173.245.59.135 along with 3 other IP addresses.

Mail Servers

Incoming mail for teachstack.org is delivered via three mail servers: route1.mx.cloudflare.net, route2.mx.cloudflare.net and route3.mx.cloudflare.net.

teachstack.org shares mail servers — at least in part — with other domains, including jeanpeau.pl, lunchtrain.se, mtamaramu.com and two others.

Host names with 6 IP numbers:

Hostname route1.mx.cloudflare.net directs to 162.159.205.11, 162.159.205.12 and 162.159.205.13 along with 3 other IP addresses.

Hostname route2.mx.cloudflare.net directs to 162.159.205.17, 162.159.205.18 and 162.159.205.19 along with 3 other IP addresses.

Hostname route3.mx.cloudflare.net directs to 162.159.205.23, 162.159.205.24 and 162.159.205.25 along with 3 other IP addresses.

teachstack.org - robtex.com

teachstack.org

org

Same first word

Similar names

Previous names

Next names

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

Analysis

IP Addresses

Name Servers

Mail Servers

`teachstack.org`

`org`