🛡️Domain Reputation CheckBlocklist, phishing & malware status→

`substackos.com`

DNSSEC	⚠️ Not signed
A	2606:4700:3033::6815:4636^{🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3035::ac43:dc6e^{🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.70.54^{Cloudflare104.21.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.220.110^{🇺🇸 Cloudflare172.67.208.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`abby.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3a64^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`abby.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c064^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`abby.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2064^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`abby.ns.cloudflare.com`
		A	108.162.192.100^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`abby.ns.cloudflare.com`
		A	172.64.32.100^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`abby.ns.cloudflare.com`
		A	173.245.58.100^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`abby.ns.cloudflare.com`
NS	`apollo.ns.cloudflare.com`
		A	2606:4700:58::adf5:3b42^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`apollo.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c142^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`apollo.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2142^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`apollo.ns.cloudflare.com`
		A	108.162.193.66^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`apollo.ns.cloudflare.com`
		A	172.64.33.66^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`apollo.ns.cloudflare.com`
		A	173.245.59.66^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`apollo.ns.cloudflare.com`
MX	`mx1.mail.ovh.net` ⭐
		A	188.165.36.237^{🇫🇷 OVH188.165.0.0/16 ISP Paris, France}
			PTR	`mx1.mail.ovh.net`
MX	`mx2.mail.ovh.net`⁽⁵⁾
		A	87.98.160.167^{🇫🇷 OVH87.98.128.0/17 ISP Paris, France}
			PTR	`mx2.mail.ovh.net`
MX	`mx3.mail.ovh.net`⁽¹⁰⁰⁾
		A	91.121.53.175^{🇫🇷 OVH91.121.0.0/16 ISP Paris, France}
			PTR	`mx3.mail.ovh.net`
TXT	`1\|www.substackos.com`
TXT	`pinterest-site-verification=6807ffd6eedaefcee051be31553088f6`
TXT	`v=spf1 include:mx.ovh.com -all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.70.54, 172.67.220.110
		IPv6 hints	2606:4700:3033::6815:4636, 2606:4700:3035::ac43:dc6e
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=26, name=cloudflare-ech.com
SOA	`abby.ns.cloudflare.com`dns@cloudflare.com serial=2408673065

`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=1787594296

Same first word

substackos.com

Previous names

Next names

DNS History

9 records (9 active, 0 former)

●NSabby.ns.cloudflare.com2026-08-17 → 2026-08-24 · 2 obs

● 2026-08-17 15:51:14
● 2026-08-24 18:07:34

●NSapollo.ns.cloudflare.com2026-08-17 → 2026-08-24 · 2 obs

● 2026-08-17 15:51:14
● 2026-08-24 18:07:34

●MXmx1.mail.ovh.net2026-08-17 → 2026-08-24 · 2 obs

● 2026-08-17 15:51:14
● 2026-08-24 18:07:34

●MXmx2.mail.ovh.net2026-08-17 → 2026-08-24 · 2 obs

● 2026-08-17 15:51:14
● 2026-08-24 18:07:34

●MXmx3.mail.ovh.net2026-08-17 → 2026-08-24 · 2 obs

● 2026-08-17 15:51:14
● 2026-08-24 18:07:34

●A104.21.70.542026-08-17 → 2026-08-24 · 2 obs

● 2026-08-17 15:51:14
● 2026-08-24 18:07:34

●A172.67.220.1102026-08-17 → 2026-08-24 · 2 obs

● 2026-08-17 15:51:14
● 2026-08-24 18:07:34

●A2606:4700:3033::6815:46362026-08-17 → 2026-08-24 · 2 obs

● 2026-08-17 15:51:14
● 2026-08-24 18:07:34

●A2606:4700:3035::ac43:dc6e2026-08-17 → 2026-08-24 · 2 obs

● 2026-08-17 15:51:14
● 2026-08-24 18:07:34

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	j.gtld-servers.net, g.gtld-servers.net, m.gtld-servers.net, e.gtld-servers.net...	-
substackos.com	abby.ns.cloudflare.com, apollo.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.193.66

NS records: abby.ns.cloudflare.com, apollo.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for substackos.com (unsigned zone)

⏱️ Timing

Total: 240ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.70.54, 172.67.220.110`
AAAA	2	`2606:4700:3033::6815:4636, 2606:4700:3035::ac43:dc6e`
NS	2	`abby.ns.cloudflare.com, apollo.ns.cloudflare.com`
MX	3	`mx1.mail.ovh.net (pri: 1), mx3.mail.ovh.net (pri: 100)...`
TXT	3	`1\|www.substackos.com, pinterest-site-verification=6807ffd6eeda...`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`abby.ns.cloudflare.com dns.cloudflare.co`

📌 Glue Records Collected

Total: 12

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

Analysis

IP Addresses

substackos.com directs to four IP numbers, which are 104.21.70.54, 172.67.220.110, 2606:4700:3033::6815:4636 and 2606:4700:3035::ac43:dc6e.

Among the host names that share IP numbers with substackos.com are pomelowinecompany.com, login.kujangbet168-gokil.site, www.bitonlongwallet.com and two others.

Name Servers

The NS records for substackos.com delegate to abby.ns.cloudflare.com and apollo.ns.cloudflare.com.

substackos.com has the same name server delegation as a number of other domains, such as russellbrinson.com, domoticavoorscholen.nl, tijdelijkalarm.nl and two more.

The name servers of substackos.com overlap at least partially with those of other domains — among them baoabothailand.com, dreamshirts.ru, camilatkluppel.workers.dev and two more.

The name servers lloyd.ns.cloudflare.com, crystal.ns.cloudflare.com and lucy.ns.cloudflare.com are commonly seen alongside these name servers.

Host names resolving to 6 IP numbers:

abby.ns.cloudflare.com maps to 108.162.192.100, 172.64.32.100, 173.245.58.100 and 3 additional IP addresses.

apollo.ns.cloudflare.com maps to 108.162.193.66, 172.64.33.66, 173.245.59.66 and 3 additional IP addresses.

Mail Servers

Mail for substackos.com is routed through three mail servers — mx1.mail.ovh.net, mx2.mail.ovh.net and mx3.mail.ovh.net.

substackos.com shares at least some of its mail servers with other domains — for example evidenceb-services.com, artemium.net, chambresdhotesgidaszewski.com and two more.

The mail servers mx4.mail.ovh.net and mx0.mail.ovh.net are commonly paired with these mail servers.

mx1.mail.ovh.net has IP address 188.165.36.237, mx2.mail.ovh.net has IP address 87.98.160.167 and mx3.mail.ovh.net has IP address 91.121.53.175 — one address each.

substackos.com - robtex.com

substackos.com

com

Same first word

Previous names

Next names

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

📌 Glue Records Collected

Analysis

IP Addresses

Name Servers

Mail Servers

`substackos.com`

`com`