pub.open.substack.com - dns.ninja

pub.open.substack.com

DNSSEC⚠️ Not signed
A2606:4700:4401::ac40:9638🇺🇸 Cloudflare2606:4700:4401::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:4404::6812:25c8🇺🇸 Cloudflare2606:4700:4404::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.18.37.200Cloudflare104.18.37.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.64.150.56🇺🇸 Cloudflare172.64.150.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.18.37.200, 172.64.150.56
IPv6 hints2606:4700:4401::ac40:9638, 2606:4700:4404::6812:25c8

open.substack.com

DNSSEC⚠️ Not signed
A2606:4700:4401::ac40:9638🇺🇸 Cloudflare2606:4700:4401::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:4404::6812:25c8🇺🇸 Cloudflare2606:4700:4404::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.18.37.200Cloudflare104.18.37.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.64.150.56🇺🇸 Cloudflare172.64.150.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.18.37.200, 172.64.150.56
IPv6 hints2606:4700:4401::ac40:9638, 2606:4700:4404::6812:25c8
WOT: SAFE (60/100)

Subdomains

sportslandactivityfarms.pub.open.substack.com
edwardmwakana.pub.open.substack.com
jameswillam.pub.open.substack.com
prostatagesundheit.pub.open.substack.com
favike.pub.open.substack.com

Same first word

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Similar names

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DNS History

6 records (4 active, 2 former)

A104.18.37.200172.64.150.562606:4700:4401::ac40:96382606:4700:4404::6812:25c82606:4700:4400::ac40:96382606:4700:440b::6812:25c8
●A104.18.37.2002026-03-15 → 2026-06-28 · 2 obs
● 2026-03-15 11:23:00
● 2026-06-28 19:27:00
●A172.64.150.562026-03-15 → 2026-06-28 · 2 obs
● 2026-03-15 11:23:00
● 2026-06-28 19:27:00
○A2606:4700:4400::ac40:96382026-03-15 → 2026-06-12 · 4 obs
● 2026-03-15 11:23:00
● 2026-06-12 20:37:02
○ 2026-06-28 15:32:14
○ 2026-06-28 19:27:00
●A2606:4700:4401::ac40:96382026-06-28 → 2026-06-28 · 3 obs
○ 2026-06-12 20:37:02
● 2026-06-28 15:32:14
● 2026-06-28 19:27:00
●A2606:4700:4404::6812:25c82026-06-28 → 2026-06-28 · 3 obs
○ 2026-06-12 20:37:02
● 2026-06-28 15:32:14
● 2026-06-28 19:27:00
○A2606:4700:440b::6812:25c82026-03-15 → 2026-06-12 · 4 obs
● 2026-03-15 11:23:00
● 2026-06-12 20:37:02
○ 2026-06-28 15:32:14
○ 2026-06-28 19:27:00

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
comd.gtld-servers.net, g.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net...-
substack.comlee.ns.cloudflare.com, ali.ns.cloudflare.com12 records

✅ Authoritative Response

Server:108.162.192.59

NS records: lee.ns.cloudflare.com, ali.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for substack.com (unsigned zone)

⏱️ Timing

Total: 158ms | Queries: -

📄 Records

TypeCountSample Data
A2172.64.150.56, 104.18.37.200
AAAA22606:4700:4401::ac40:9638, 2606:4700:4404::6812:25c8
HTTPS1{"priority":1,"target":".","alpn":["h3",

📌 Glue Records Collected

Total: 12

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

Analysis

Hierarchy

pub.open.substack.com has five child domains: sportslandactivityfarms.pub.open.substack.com, edwardmwakana.pub.open.substack.com, jameswillam.pub.open.substack.com, prostatagesundheit.pub.open.substack.com and favike.pub.open.substack.com.

IP Addresses

pub.open.substack.com points to the four IP addresses 104.18.37.200, 172.64.150.56, 2606:4700:4401::ac40:9638 and 2606:4700:4404::6812:25c8.

Two other host names, along with newsom2028.substack.com, p.justrifatseo.substack.com and centerforchinaanalysis.substack.com, also share IP numbers with pub.open.substack.com.