🛡️Domain Reputation CheckBlocklist, phishing & malware status→

`systemsthinker.dev`

DNSSEC	⚠️ Not signed
A	2606:4700:3033::6815:5662^{🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3034::ac43:d96d^{🇺🇸 Cloudflare2606:4700:3034::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.86.98^{Cloudflare104.21.80.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.217.109^{🇺🇸 Cloudflare172.67.208.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`simon.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3be8^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`simon.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c1e8^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`simon.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:21e8^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`simon.ns.cloudflare.com`
		A	108.162.193.232^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`simon.ns.cloudflare.com`
		A	172.64.33.232^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`simon.ns.cloudflare.com`
		A	173.245.59.232^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`simon.ns.cloudflare.com`
NS	`violet.ns.cloudflare.com`
		A	2606:4700:50::adf5:3aed^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`violet.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c0ed^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`violet.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:20ed^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`violet.ns.cloudflare.com`
		A	108.162.192.237^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`violet.ns.cloudflare.com`
		A	172.64.32.237^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`violet.ns.cloudflare.com`
		A	173.245.58.237^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`violet.ns.cloudflare.com`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.86.98, 172.67.217.109
		IPv6 hints	2606:4700:3033::6815:5662, 2606:4700:3034::ac43:d96d
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=99, name=cloudflare-ech.com
SOA	`simon.ns.cloudflare.com`dns@cloudflare.com serial=2413793954

`dev`

	DNSSEC	🔒 Signed (DS record present)
	NS	`ns-tld1.charlestonroadregistry.com` ⭐
	NS	`ns-tld2.charlestonroadregistry.com`
	NS	`ns-tld3.charlestonroadregistry.com`
	NS	`ns-tld4.charlestonroadregistry.com`
	NS	`ns-tld5.charlestonroadregistry.com`
	SOA	`ns-tld1.charlestonroadregistry.com`cloud-dns-hostmaster@google.com serial=1

🔒 HSTS Preload (+subdomains)

Same first word

systemsthinker.de

systemsthinker.institute

systemsthinker.app

systemsthinker.eu

systemsthinker.vn

systemsthinker.dev

Similar names

thinkersystems.com

rethinksystems.in

rethinksystems.com

systemthinkers.blogspot.com

Previous names

Next names

DNS History

6 records (6 active, 0 former)

●NSsimon.ns.cloudflare.com2026-09-05 → 2026-09-06 · 2 obs

● 2026-09-05 06:02:26
● 2026-09-06 19:01:14

●NSviolet.ns.cloudflare.com2026-09-05 → 2026-09-06 · 2 obs

● 2026-09-05 06:02:26
● 2026-09-06 19:01:14

●A104.21.86.982026-09-05 → 2026-09-06 · 2 obs

● 2026-09-05 06:02:26
● 2026-09-06 19:01:14

●A172.67.217.1092026-09-05 → 2026-09-06 · 2 obs

● 2026-09-05 06:02:26
● 2026-09-06 19:01:14

●A2606:4700:3033::6815:56622026-09-05 → 2026-09-06 · 2 obs

● 2026-09-05 06:02:26
● 2026-09-06 19:01:14

●A2606:4700:3034::ac43:d96d2026-09-05 → 2026-09-06 · 2 obs

● 2026-09-05 06:02:26
● 2026-09-06 19:01:14

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
dev	ns-tld1.charlestonroadregistry.com, ns-tld2.charlestonroadregistry.com, ns-tld3.charlestonroadregistry.com, ns-tld4.charlestonroadregistry.com...	-
systemsthinker.dev	violet.ns.cloudflare.com, simon.ns.cloudflare.com	-

✅ Authoritative Response

Server:108.162.193.232

NS records: violet.ns.cloudflare.com, simon.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for systemsthinker.dev (unsigned zone)

⏱️ Timing

Total: 2013ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.217.109, 104.21.86.98`
AAAA	2	`2606:4700:3034::ac43:d96d, 2606:4700:3033::6815:5662`
NS	2	`simon.ns.cloudflare.com, violet.ns.cloudflare.com`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`simon.ns.cloudflare.com dns.cloudflare.c`

Analysis

IP Addresses

systemsthinker.dev resolves to four IP addresses: 104.21.86.98, 172.67.217.109, 2606:4700:3033::6815:5662 and 2606:4700:3034::ac43:d96d.

Additional host names — fa8-king777.bet, tde4j.org, coluzzipesca.com and two others — share IP numbers with systemsthinker.dev.

Name Servers

systemsthinker.dev has two authoritative name servers — simon.ns.cloudflare.com and violet.ns.cloudflare.com.

systemsthinker.dev shares its name server setup with other domains, including fuzzylab.org, maddy-murk.ru, saas-knowledge-base.com and two others.

systemsthinker.dev has at least partial name server overlap with other domains, such as yuzijiang.cc, wantitoto.org, congres-vert.com and two others.

These name servers tend to appear together with the name servers bob.ns.cloudflare.com, reese.ns.cloudflare.com and lina.ns.cloudflare.com.

Host names with 6 IP numbers:

simon.ns.cloudflare.com points to 108.162.193.232, 172.64.33.232, 173.245.59.232 and 3 other IP addresses.

violet.ns.cloudflare.com points to 108.162.192.237, 172.64.32.237, 173.245.58.237 and 3 other IP addresses.

systemsthinker.dev - robtex.com