🛡️Domain Reputation CheckBlocklist, phishing & malware status→

`substackcourse.com`

DNSSEC	⚠️ Not signed
A	162.159.134.42^{Cloudflare162.159.128.0/19 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
NS	`ns-451.awsdns-56.com` ⭐
		A	2600:9000:5301:c300::1^{🇺🇸 Amazon2600:9000:5301::/48 - CloudFront}
			PTR	`ns-451.awsdns-56.com`
		A	205.251.193.195^{🇺🇸 Amazon205.251.193.0/24 prefix}
			PTR	`ns-451.awsdns-56.com`
NS	`ns-1085.awsdns-07.org`
		A	2600:9000:5304:3d00::1^{🇺🇸 Amazon2600:9000:5304::/48 - CloudFront}
			PTR	`ns-1085.awsdns-07.org`
		A	205.251.196.61^{🇺🇸 Amazon205.251.196.0/24 prefix}
			PTR	`ns-1085.awsdns-07.org`
NS	`ns-1899.awsdns-45.co.uk`
		A	2600:9000:5307:6b00::1^{🇺🇸 Amazon2600:9000:5307::/48 - CloudFront}
			PTR	`ns-1899.awsdns-45.co.uk`
		A	205.251.199.107^{🇺🇸 Amazon205.251.199.0/24 prefix}
			PTR	`ns-1899.awsdns-45.co.uk`
NS	`ns-916.awsdns-50.net`
		A	2600:9000:5303:9400::1^{🇺🇸 Amazon2600:9000:5303::/48 - CloudFront}
			PTR	`ns-916.awsdns-50.net`
		A	205.251.195.148^{🇺🇸 Amazon205.251.195.0/24 prefix}
			PTR	`ns-916.awsdns-50.net`
TXT	`ca3-f3d10f4330c0443c9e47c9fac0f4656e`
TXT	`google-site-verification=Cs4RfmGr3-DELSU-lteRQzba9ZInnX9bTHElqv7VaFA`
SOA	`ns-451.awsdns-56.com`awsdns-hostmaster@amazon.com serial=1

`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=1787020344

Same first word

substackcourse.com

Previous names

Next names

DNS History

13 records (5 active, 8 former)

○NSdns1.registrar-servers.com2020-02-25 → 2020-02-25 · 3 obs

● 2020-02-25 09:49:02
○ 2026-03-27 02:30:14
○ 2026-08-18 02:35:50

○NSdns2.registrar-servers.com2020-02-25 → 2020-02-25 · 3 obs

● 2020-02-25 09:49:02
○ 2026-03-27 02:30:14
○ 2026-08-18 02:35:50

●NSns-1085.awsdns-07.org2026-03-27 → 2026-08-18 · 3 obs

○ 2020-02-25 09:49:02
● 2026-03-27 02:30:14
● 2026-08-18 02:35:50

●NSns-1899.awsdns-45.co.uk2026-03-27 → 2026-08-18 · 3 obs

○ 2020-02-25 09:49:02
● 2026-03-27 02:30:14
● 2026-08-18 02:35:50

●NSns-451.awsdns-56.com2026-03-27 → 2026-08-18 · 3 obs

○ 2020-02-25 09:49:02
● 2026-03-27 02:30:14
● 2026-08-18 02:35:50

●NSns-916.awsdns-50.net2026-03-27 → 2026-08-18 · 3 obs

○ 2020-02-25 09:49:02
● 2026-03-27 02:30:14
● 2026-08-18 02:35:50

○MXeforward1.registrar-servers.com2020-02-25 → 2020-02-25 · 3 obs

● 2020-02-25 09:49:02
○ 2026-03-27 02:30:14
○ 2026-08-18 02:35:50

○MXeforward2.registrar-servers.com2020-02-25 → 2020-02-25 · 3 obs

● 2020-02-25 09:49:02
○ 2026-03-27 02:30:14
○ 2026-08-18 02:35:50

○MXeforward3.registrar-servers.com2020-02-25 → 2020-02-25 · 3 obs

● 2020-02-25 09:49:02
○ 2026-03-27 02:30:14
○ 2026-08-18 02:35:50

○MXeforward4.registrar-servers.com2020-02-25 → 2020-02-25 · 3 obs

● 2020-02-25 09:49:02
○ 2026-03-27 02:30:14
○ 2026-08-18 02:35:50

○MXeforward5.registrar-servers.com2020-02-25 → 2020-02-25 · 3 obs

● 2020-02-25 09:49:02
○ 2026-03-27 02:30:14
○ 2026-08-18 02:35:50

●A162.159.134.422026-03-27 → 2026-08-18 · 3 obs

○ 2020-02-25 09:49:02
● 2026-03-27 02:30:14
● 2026-08-18 02:35:50

○A162.255.119.782020-02-25 → 2020-02-25 · 3 obs

● 2020-02-25 09:49:02
○ 2026-03-27 02:30:14
○ 2026-08-18 02:35:50

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
substackcourse.com	ns-451.awsdns-56.com, ns-916.awsdns-50.net, ns-1085.awsdns-07.org, ns-1899.awsdns-45.co.uk	2 records

✅ Authoritative Response

Server:205.251.193.195

NS records: ns-451.awsdns-56.com, ns-916.awsdns-50.net, ns-1085.awsdns-07.org, ns-1899.awsdns-45.co.uk

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for substackcourse.com (unsigned zone)

⏱️ Timing

Total: 578ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`162.159.134.42`
NS	4	`ns-1085.awsdns-07.org, ns-1899.awsdns-45.co.uk...`
TXT	2	`ca3-f3d10f4330c0443c9e47c9fac0f4656e, google-site-verification=Cs4RfmGr3-DELSU`
SOA	1	`ns-451.awsdns-56.com awsdns-hostmaster.a`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns-451.awsdns-56.com, ns-451.awsdns-56.com)

Analysis

IP Addresses

substackcourse.com resolves to one IP address: 162.159.134.42.

insnap.in, medfleet.com, www.sens-tech.com and two other host names share IP numbers with substackcourse.com.

Name Servers

The authoritative name servers for substackcourse.com are ns-451.awsdns-56.com, ns-916.awsdns-50.net, ns-1085.awsdns-07.org and ns-1899.awsdns-45.co.uk.

substackcourse.com partially shares its NS delegation with several other domains, including yyprobe.com, vizion-host.com, homify.sk and two others.

ns-451.awsdns-56.com, ns-916.awsdns-50.net, ns-1085.awsdns-07.org and ns-1899.awsdns-45.co.uk each carry two IP addresses. ns-451.awsdns-56.com has 205.251.193.195 and 2600:9000:5301:c300::1; ns-916.awsdns-50.net has 205.251.195.148 and 2600:9000:5303:9400::1; ns-1085.awsdns-07.org has 205.251.196.61 and 2600:9000:5304:3d00::1; ns-1899.awsdns-45.co.uk has 205.251.199.107 and 2600:9000:5307:6b00::1.

substackcourse.com - robtex.com