🛡️Domain Reputation CheckBlocklist, phishing & malware status→

`substackchallenge.com`

DNSSEC	⚠️ Not signed
NS	`curt.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3b5e^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`curt.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c15e^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`curt.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:215e^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`curt.ns.cloudflare.com`
		A	108.162.193.94^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`curt.ns.cloudflare.com`
		A	172.64.33.94^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`curt.ns.cloudflare.com`
		A	173.245.59.94^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`curt.ns.cloudflare.com`
NS	`lucy.ns.cloudflare.com`
		A	2606:4700:50::adf5:3a85^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`lucy.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c085^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`lucy.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2085^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`lucy.ns.cloudflare.com`
		A	108.162.192.133^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`lucy.ns.cloudflare.com`
		A	172.64.32.133^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`lucy.ns.cloudflare.com`
		A	173.245.58.133^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`lucy.ns.cloudflare.com`
SOA	`curt.ns.cloudflare.com`dns@cloudflare.com serial=2409634199

`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=1787739905

Same first word

substackchallenge.com

Previous names

Next names

DNS History

2 records (2 active, 0 former)

●NScurt.ns.cloudflare.com2026-08-17 → 2026-08-26 · 2 obs

● 2026-08-17 15:51:14
● 2026-08-26 10:33:10

●NSlucy.ns.cloudflare.com2026-08-17 → 2026-08-26 · 2 obs

● 2026-08-17 15:51:14
● 2026-08-26 10:33:10

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, f.gtld-servers.net, k.gtld-servers.net, b.gtld-servers.net...	-
substackchallenge.com	lucy.ns.cloudflare.com, curt.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.192.133

NS records: lucy.ns.cloudflare.com, curt.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for substackchallenge.com (unsigned zone)

⏱️ Timing

Total: 145ms | Queries: -

📄 Records

Type	Count	Sample Data
NS	2	`curt.ns.cloudflare.com, lucy.ns.cloudflare.com`
SOA	1	`curt.ns.cloudflare.com dns.cloudflare.co`

📌 Glue Records Collected

Total: 12

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

Analysis

Name Servers

substackchallenge.com has two authoritative name servers — curt.ns.cloudflare.com and lucy.ns.cloudflare.com.

The name server configuration of substackchallenge.com is shared with other domains, for instance bitzac.com, cottagehospital.org, toxtalk.net and two others.

At least some of substackchallenge.com's name servers are shared with other domains, for example kindred-scotland.org, redizajn.ba, shravani.group and two more.

It is common for these name servers to be used in conjunction with the name servers rafe.ns.cloudflare.com, damian.ns.cloudflare.com and dalary.ns.cloudflare.com.

Hosts with 6 IP addresses each:

curt.ns.cloudflare.com points to 108.162.193.94, 172.64.33.94, 173.245.59.94 and 3 other IP addresses.

lucy.ns.cloudflare.com points to 108.162.192.133, 172.64.32.133, 173.245.58.133 and 3 other IP addresses.

substackchallenge.com - robtex.com