About SubDoms

SubDoms (subdoms.com) is an independent, free website about one practical topic: subdomains – what they are, how to create them, how to point them at the right server or service, how to secure them with SSL, and when a subfolder is the better choice.

Who it is for

Website owners, developers, students and small-business IT staff who need to set up something like blog.example.com, shop.example.com or staging.example.com and want clear, provider-neutral instructions.

What is on the site

• Step-by-step setup guide on the home page, with example DNS records.
• Reference guides: DNS record types, common subdomain types and subdomain vs. subfolder SEO.
• Articles on wildcard subdomains, staging environments, SSL certificate options, microservices and subdomain takeover prevention.
• Free lookup tools that run in your browser using public DNS-over-HTTPS and RDAP services, plus a subdomain name generator and a DNS record planner.
• FAQ and a list of external references (RFCs and provider documentation).

What SubDoms is not

SubDoms does not sell domains, DNS hosting, monitoring plans or consulting, and it has no user accounts. It is not affiliated with any registrar, DNS provider or certificate authority mentioned in its guides.

How the site is run

The site is maintained independently as a static website and is supported by advertising (Google AdSense). Guides are reviewed and corrected over time; if you spot an error or something that has changed at a provider, please let us know through the contact page.