substack.com - dns.ninja
substack.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 2606:4700:4401::ac40:9638🇺🇸 Cloudflare2606:4700:4401::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 2606:4700:4404::6812:25c8🇺🇸 Cloudflare2606:4700:4404::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 104.18.37.200Cloudflare104.18.37.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 172.64.150.56🇺🇸 Cloudflare172.64.150.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| NS | ali.ns.cloudflare.com ⭐ | ||||||
| A | 2606:4700:50::adf5:3a3b🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | ali.ns.cloudflare.com | ||||||
| A | 2803:f800:50::6ca2:c03b🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L | ||||||
| PTR | ali.ns.cloudflare.com | ||||||
| A | 2a06:98c1:50::ac40:203b🇺🇸 Cloudflare2a06:98c1:50::/45 | ||||||
| PTR | ali.ns.cloudflare.com | ||||||
| A | 108.162.192.59🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | ali.ns.cloudflare.com | ||||||
| A | 172.64.32.59🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | ali.ns.cloudflare.com | ||||||
| A | 173.245.58.59🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | ali.ns.cloudflare.com | ||||||
| NS | lee.ns.cloudflare.com | ||||||
| A | 2606:4700:58::adf5:3b81🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | lee.ns.cloudflare.com | ||||||
| A | 2803:f800:50::6ca2:c181🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L | ||||||
| PTR | lee.ns.cloudflare.com | ||||||
| A | 2a06:98c1:50::ac40:2181🇺🇸 Cloudflare2a06:98c1:50::/45 | ||||||
| PTR | lee.ns.cloudflare.com | ||||||
| A | 108.162.193.129🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | lee.ns.cloudflare.com | ||||||
| A | 172.64.33.129🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | lee.ns.cloudflare.com | ||||||
| A | 173.245.59.129🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | lee.ns.cloudflare.com | ||||||
| MX | mxa.mailgun.org ⭐ | ||||||
| A | 34.36.182.139🇺🇸 Google34.32.0.0/11 | ||||||
| PTR | 139.182.36.34.bc.googleusercontent.com | ||||||
| MX | mxb.mailgun.org ⭐ | ||||||
| A | 34.149.254.5🇺🇸 Google34.148.0.0/14 | ||||||
| PTR | 5.254.149.34.bc.googleusercontent.com | ||||||
| TXT | facebook-domain-verification=8vbxp2ntmkudc6is3h5r840c9fwo7f | ||||||
| TXT | google-site-verification=4V_X38Yf0J4VJcWFwtG38bOS1nkOWeIWJhticlMgNQE | ||||||
| TXT | google-site-verification=DAkdykID6WqQM6tT7IfSu9_uB7-qIdB039MA_C3T3eA | ||||||
| TXT | google-site-verification=FfNIQIxsRHpj3Y7E_d3N6GFqGgWDZ-sfYojqCilwtqE | ||||||
| TXT | google-site-verification=SXEl7_p4SBszcanSWwVc_3-RFky80c0-94janbeeWI4 | ||||||
| TXT | google-site-verification=vQEKLOUDfKNOQAv9W3EUMiRD6e5ibAEPhc2yCzP7big | ||||||
| TXT | tiktok-developers-site-verification=7PgqCAJ52ILLOqf2KELd8uaRfJpuzaLQ | ||||||
| TXT | tiktok-developers-site-verification=A9XRSo8lWy5CPFJ0bqI04KCpUZGAAq7p | ||||||
| TXT | v=spf1 include:_spf.google.com include:mailgun.org include:mail.zendesk.com ~all | ||||||
| HTTPS | HTTP/3, HTTP/2 ✓ hints match | ||||||
| IPv4 hints | 104.18.37.200, 172.64.150.56 | ||||||
| IPv6 hints | 2606:4700:4401::ac40:9638, 2606:4700:4404::6812:25c8 | ||||||
| SOA | ali.ns.cloudflare.comdns@cloudflare.com serial=2410510401 | ||||||
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.netnstld@verisign-grs.com serial=1785547102 | ||||||
rank #105 in the tld
substack.com
Substack is an online platform that lets writers publish newsletters and blogs, build a subscriber base, and monetize their content through paid subscriptions. It is operated by Substack Inc., a US-based company.
Key facts
- Owner / operator: Substack Inc.
- TLD:
.com— gTLD - Primary purpose: newsletter publishing and subscription platform
- Status: active
History
| Year | Event |
|---|---|
| 2017 | Substack founded and platform launched |
| 2021 | Company raised significant venture funding, expanding into podcasts and video |
| 2023 | Launched Substack Notes, a social feed feature |
Notable subdomains or services
*.substack.com— individual writer newsletters and publication sites are hosted on subdomains of this pattern
Related domains
substackcdn.com— content delivery domain used to serve images and assets for Substack publications
Semrush Rank:#326 Keywords:20,965,247 Traffic:8,317,919/mo
📈 Tranco rank: #453
Substack is a newsletter platform founded in 2017, enabling writers to build paid subscription businesses. With millions of readers and top writers earning over $1 million annually, Substack has revitalized independent journalism and writing.
Substack offers newsletter creation, paid subscriptions, podcasting, and Notes (social features). The platform takes a 10% cut of subscription revenue, making it attractive to independent writers.
Substack's infrastructure handles email delivery for thousands of newsletters with sophisticated deliverability optimization.
DNS for substack.com uses Cloudflare's authoritative DNS infrastructure. Email authentication is critical for newsletter deliverability.
Subdomains
Same first word
substack.it |
substack.com |
substack.today |
substack.net |
substack.link |
substack.co |
substack.ai |
substack.ca |
substack.life |
substack.info |
Similar names
DNS History
37 records (8 active, 29 former)
●NSali.ns.cloudflare.com2021-08-10 → 2026-08-01 · 3 obs
● 2021-08-10 13:52:56
● 2026-08-01 01:47:42
●NSlee.ns.cloudflare.com2021-08-10 → 2026-08-01 · 3 obs
● 2021-08-10 13:52:56
● 2026-08-01 01:47:42
○NSns-1070.awsdns-05.org2019-08-21 → 2019-08-21 · 4 obs
● 2019-08-21 23:43:10
○ 2021-08-10 13:52:56
○ 2026-08-01 01:47:42
○NSns-1948.awsdns-51.co.uk2019-08-21 → 2019-08-21 · 4 obs
● 2019-08-21 23:43:10
○ 2021-08-10 13:52:56
○ 2026-08-01 01:47:42
○NSns-212.awsdns-26.com2019-08-21 → 2019-08-21 · 4 obs
● 2019-08-21 23:43:10
○ 2021-08-10 13:52:56
○ 2026-08-01 01:47:42
○NSns-711.awsdns-24.net2019-08-21 → 2019-08-21 · 4 obs
● 2019-08-21 23:43:10
○ 2021-08-10 13:52:56
○ 2026-08-01 01:47:42
○NSns1.namebrightdns.com2015-07-22 → 2017-04-08 · 6 obs
○ 2015-11-22 20:21:14
● 2016-03-12 09:40:18
● 2017-04-08 12:46:32
○ 2019-08-21 23:43:10
○ 2026-08-01 01:47:42
○NSns2.namebrightdns.com2015-07-22 → 2017-04-08 · 6 obs
○ 2015-11-22 20:21:14
● 2016-03-12 09:40:18
● 2017-04-08 12:46:32
○ 2019-08-21 23:43:10
○ 2026-08-01 01:47:42
○NSnsg1.namebrightdns.com2015-11-22 → 2016-03-12 · 5 obs
● 2015-11-22 20:21:14
● 2016-03-12 09:40:18
○ 2016-07-11 19:32:46
○ 2026-08-01 01:47:42
○NSnsg2.namebrightdns.com2015-11-22 → 2015-11-22 · 4 obs
● 2015-11-22 20:21:14
○ 2016-03-12 09:40:18
○ 2026-08-01 01:47:42
○MXanmail.namebrightmail.com2015-07-22 → 2015-07-22 · 3 obs
○ 2015-11-22 20:21:14
○ 2026-08-01 01:47:42
●MXmxa.mailgun.org2019-08-21 → 2026-08-01 · 3 obs
● 2019-08-21 23:43:10
● 2026-08-01 01:47:42
●MXmxb.mailgun.org2019-08-21 → 2026-08-01 · 3 obs
● 2019-08-21 23:43:10
● 2026-08-01 01:47:42
○A104.18.0.2012021-08-10 → 2021-08-10 · 4 obs
● 2021-08-10 13:52:56
○ 2026-02-14 18:23:28
○ 2026-08-01 01:47:42
○A104.18.1.2012021-08-10 → 2021-08-10 · 4 obs
● 2021-08-10 13:52:56
○ 2026-02-14 18:23:28
○ 2026-08-01 01:47:42
●A104.18.37.2002026-02-14 → 2026-08-01 · 3 obs
● 2026-02-14 18:23:28
● 2026-08-01 01:47:42
○A107.23.198.2402016-07-11 → 2016-07-11 · 4 obs
● 2016-07-11 19:32:46
○ 2017-04-08 12:46:32
○ 2026-08-01 01:47:42
○A13.224.77.1002019-08-21 → 2019-08-21 · 4 obs
● 2019-08-21 23:43:10
○ 2021-08-10 13:52:56
○ 2026-08-01 01:47:42
○A13.224.77.1122019-08-21 → 2019-08-21 · 4 obs
● 2019-08-21 23:43:10
○ 2021-08-10 13:52:56
○ 2026-08-01 01:47:42
○A13.224.77.1192019-08-21 → 2019-08-21 · 4 obs
● 2019-08-21 23:43:10
○ 2021-08-10 13:52:56
○ 2026-08-01 01:47:42
○A13.224.77.172019-08-21 → 2019-08-21 · 4 obs
● 2019-08-21 23:43:10
○ 2021-08-10 13:52:56
○ 2026-08-01 01:47:42
●A172.64.150.562026-02-14 → 2026-08-01 · 3 obs
● 2026-02-14 18:23:28
● 2026-08-01 01:47:42
○A2606:4700::6812:1c92021-08-10 → 2021-08-10 · 4 obs
● 2021-08-10 13:52:56
○ 2026-02-14 18:23:28
○ 2026-08-01 01:47:42
○A2606:4700::6812:c92021-08-10 → 2021-08-10 · 4 obs
● 2021-08-10 13:52:56
○ 2026-02-14 18:23:28
○ 2026-08-01 01:47:42
○A2606:4700:4400::ac40:96382026-02-14 → 2026-02-14 · 4 obs
● 2026-02-14 18:23:28
○ 2026-06-21 01:52:24
○ 2026-08-01 01:47:42
●A2606:4700:4401::ac40:96382026-06-21 → 2026-08-01 · 3 obs
● 2026-06-21 01:52:24
● 2026-08-01 01:47:42
●A2606:4700:4404::6812:25c82026-06-21 → 2026-08-01 · 3 obs
● 2026-06-21 01:52:24
● 2026-08-01 01:47:42
○A2606:4700:440b::6812:25c82026-02-14 → 2026-02-14 · 4 obs
● 2026-02-14 18:23:28
○ 2026-06-21 01:52:24
○ 2026-08-01 01:47:42
○A52.0.96.242016-03-12 → 2016-03-12 · 4 obs
● 2016-03-12 09:40:18
○ 2016-07-11 19:32:46
○ 2026-08-01 01:47:42
○A52.204.129.222017-04-08 → 2017-04-08 · 4 obs
● 2017-04-08 12:46:32
○ 2019-08-21 23:43:10
○ 2026-08-01 01:47:42
○A52.4.72.1372016-07-11 → 2016-07-11 · 4 obs
● 2016-07-11 19:32:46
○ 2017-04-08 12:46:32
○ 2026-08-01 01:47:42
○A52.71.117.992016-03-12 → 2016-03-12 · 4 obs
● 2016-03-12 09:40:18
○ 2016-07-11 19:32:46
○ 2026-08-01 01:47:42
○A54.174.31.2542015-07-22 → 2015-11-22 · 4 obs
● 2015-11-22 20:21:14
○ 2016-03-12 09:40:18
○ 2026-08-01 01:47:42
○A54.208.74.2152015-07-22 → 2015-11-22 · 4 obs
● 2015-11-22 20:21:14
○ 2016-03-12 09:40:18
○ 2026-08-01 01:47:42
○A54.85.127.702017-04-08 → 2017-04-08 · 4 obs
● 2017-04-08 12:46:32
○ 2019-08-21 23:43:10
○ 2026-08-01 01:47:42
○CNAMEhdredirect-lb-399551664.us-east-1.elb.amazonaws.com2015-07-22 → 2016-07-11 · 4 obs
● 2016-07-11 19:32:46
○ 2017-04-08 12:46:32
○ 2026-08-01 01:47:42
○CNAMEhdredirect-lb3-890977680.us-east-1.elb.amazonaws.com2017-04-08 → 2017-04-08 · 4 obs
● 2017-04-08 12:46:32
○ 2019-08-21 23:43:10
○ 2026-08-01 01:47:42
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | e.gtld-servers.net, i.gtld-servers.net, b.gtld-servers.net, h.gtld-servers.net... | - |
| substack.com | lee.ns.cloudflare.com, ali.ns.cloudflare.com | 12 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: 244ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 2 | 104.18.37.200, 172.64.150.56 |
| AAAA | 2 | 2606:4700:4401::ac40:9638, 2606:4700:4404::6812:25c8 |
| NS | 2 | ali.ns.cloudflare.com, lee.ns.cloudflare.com |
| MX | 2 | mxa.mailgun.org (pri: 10), mxb.mailgun.org (pri: 10) |
| TXT | 9 | facebook-domain-verification=8vbxp2ntmku, google-site-verification=4V_X38Yf0J4VJcW... |
| HTTPS | 1 | {"priority":1,"target":".","alpn":["h3", |
| SOA | 1 | ali.ns.cloudflare.com dns.cloudflare.com |
📌 Glue Records Collected
Total: 12
Out-of-bailiwick: 12 (lee.ns.cloudflare.com, lee.ns.cloudflare.com, lee.ns.cloudflare.com...)
Related
Analysis
Hierarchy
substack.com is a parent domain of realtimeaustralia.substack.com, qbcutomerservicenumber.substack.com, ajwriter.substack.com, cardboardpackaging.substack.com, hiringmedia.substack.com and several hundred other host names.
IP Addresses
substack.com has four IP addresses: 104.18.37.200, 172.64.150.56, 2606:4700:4401::ac40:9638 and 2606:4700:4404::6812:25c8.
iloansau.substack.com, gabrieleparpiglia.substack.com, snyder.substack.com and two other host names share IP numbers with substack.com.
Name Servers
substack.com uses two name servers for its delegation: ali.ns.cloudflare.com and lee.ns.cloudflare.com.
substack.com uses the same name servers as several other domains — among them shadum.com, freedot.biz, substack.link and two more.
substack.com shares at least some of its name servers with other domains, including umeshaggarwal.in, sap2432xqh.cc, palacion.net and two others.
These name servers are frequently seen alongside the name servers galilea.ns.cloudflare.com, zod.ns.cloudflare.com, earl.ns.cloudflare.com and woz.ns.cloudflare.com.
Hostnames that resolve to 6 IP addresses:
Hostname ali.ns.cloudflare.com directs to 108.162.192.59, 172.64.32.59 and 173.245.58.59 along with 3 other IP addresses.
Hostname lee.ns.cloudflare.com directs to 108.162.193.129, 172.64.33.129 and 173.245.59.129 along with 3 other IP addresses.
Mail Servers
Mail for substack.com is handled by two mail servers — mxa.mailgun.org and mxb.mailgun.org.
substack.com uses an identical mail server configuration to several other domains — among them mason-rose.ca, mail.wetnoise.com, post.leadhit.ru and two more.
substack.com has at least partial mail server overlap with other domains such as lokobuzz.com, altroaffitto.it, ashrafulaid.org and two more.
These mail servers commonly appear together with aspmx.l.google.com, alt1.aspmx.l.google.com, alt2.aspmx.l.google.com and two other mail servers.
mxa.mailgun.org and mxb.mailgun.org each resolve to one IP number: mxa.mailgun.org points to 34.36.182.139 and mxb.mailgun.org points to 34.149.254.5.