Substack Application

The following page provides details on domains, networks, IPs, hosting services, and content delivery networks used by Substack.

Description

Substack is an online platform that allows writers, journalists, and creators to publish and monetize newsletters and other content.

Category	Business
Web Link	Substack - Home Page

Application Domains

The application domains data shown here is available in our Netify Data Feeds solution. The data is accessible via our IP API as well as downloadable datasets.

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Domains

Primary Domains

Primary Domains are owned and managed by the application vendor.

Platform Domains are often provided by hosting providers, content delivery networks, SaaS platforms and other third parties. It is important to identify these domains for DNS filters and hostname blocklists.

Platform Domains

Statuspage

{hidden}.statuspage.io

SaaS - Software-as-a-Service

Applications often use various third party platforms for providing authentication, advertising, cybersecurity, e-mail services and more. The Software-as-a-Service (SaaS) platforms used by Substack are summarized below.

SaaS	# of IPs
Mailgun	2
Zendesk	4

Service	Category	Sample IP	IP Count
Mailgun	Mail	34.102.239.211	2 IPs
Zendesk	Business	216.198.53.6	4 IPs

Hosting

Cloud hosting vendors like AWS and Microsoft Azure provide cloud-based computing and network resources to deliver applications. The hosting platforms used by Substack are summarized below by geographical points-of-presence (PoP). Each PoP can host many IPs to deliver an application.

Cloud Hosts	# of IPs
Amazon AWS	31

Host	PoP	Location	IPs
Amazon AWS	Ashburn	United States	31 IPs

Content Delivery Networks - CDNs

In order to get information to end users more quickly, many applications are distributed from multiple geographical points-of-presence (PoPs) using Content Delivery Networks (CDNs). Each PoP can host many IPs to deliver an application. A sample IP is provided.

Take special note of CDNs that use Anycast technology. Anycast makes it possible to route a single IP address to a variety of different geographic locations. In other words, one global Anycast IP is hosted in multiple geographic locations.

CDNs	# of IPs
Amazon CloudFront	12569
Cloudflare	7

Anycast

CDN	Network	Location	Sample IP	IPs
Cloudflare	Cloudflare	Global	104.18.37.200	4 IPs

PoP Locations

CDN	Network	PoP	Location	IPs
Amazon CloudFront	Amazon CloudFront	Edge - Berlin	Germany	39 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Buenos Aires	Argentina	149 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Lisbon	Portugal	177 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Johannesburg	South Africa	310 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Bucharest	Romania	43 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Santiago de Queretaro	Mexico	107 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Muscat	Oman	74 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Vienna	Austria	329 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Montreal	Canada	351 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Perth	Australia	57 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Osaka	Japan	20 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Marseille	France	405 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Tokyo	Japan	130 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Stockholm	Sweden	231 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Manila	Philippines	59 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Singapore	Singapore	210 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Paris	France	326 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Zurich	Switzerland	233 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Dublin	Ireland	96 IPs
Amazon CloudFront	Amazon CloudFront	Edge - London	United Kingdom	394 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Kansas City	United States	67 IPs
Amazon CloudFront	Amazon CloudFront	Edge - San Francisco	United States	131 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Taipei	Taiwan	80 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Tel Aviv	Israel	210 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Sydney	Australia	106 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Chicago	United States	217 IPs
Amazon CloudFront	Amazon CloudFront	Edge - New York	United States	160 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Miami	United States	485 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Dallas	United States	150 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Milan	Italy	249 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Manama	Bahrain	130 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Amsterdam	Netherlands	330 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Seoul	South Korea	99 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Vancouver	Canada	97 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Mumbai	India	140 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Toronto	Canada	90 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Sao Paulo	Brazil	148 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Kuala Lumpur	Malaysia	107 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Hyderabad	India	40 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Bogota	Colombia	84 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Chennai	India	160 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Santiago	Chile	85 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Barcelona	Spain	143 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Copenhagen	Denmark	139 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Budapest	Hungary	284 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Sofia	Bulgaria	335 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Warsaw	Poland	283 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Nairobi	Kenya	213 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Seattle	United States	98 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Helsinki	Finland	285 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Newark	United States	44 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Athens	Greece	166 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Hong Kong	Hong Kong	281 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Melbourne	Australia	136 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Frankfurt	Germany	572 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Prague	Czechia	146 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Zagreb	Croatia	203 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Dubai	United Arab Emirates	112 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Fortaleza	Brazil	126 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Lagos	Nigeria	82 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Istanbul	Turkey	88 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Madrid	Spain	273 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Munich	Germany	8 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Bangkok	Thailand	59 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Manchester	United Kingdom	101 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Los Angeles	United States	151 IPs
Amazon CloudFront	Amazon CloudFront	Edge - New Delhi	India	16 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Ashburn	United States	208 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Phoenix	United States	35 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Brisbane	Australia	59 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Kolkata	India	64 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Portland	United States	44 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Dusseldorf	Germany	35 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Lima	Peru	91 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Hamburg	Germany	73 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Boston	United States	24 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Columbus	United States	38 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Ho Chi Minh City	Vietnam	5 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Atlanta	United States	36 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Oslo	Norway	80 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Houston	United States	67 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Brussels	Belgium	72 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Rio de Janeiro	Brazil	40 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Rome	Italy	38 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Tampa	United States	4 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Denver	United States	2 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Auckland	New Zealand	39 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Bengaluru	India	4 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Cairo	Egypt	38 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Cape Town	South Africa	8 IPs
Amazon CloudFront	Amazon CloudFront	Edge - Philadelphia	United States	16 IPs