01
subdomains 1990Company Editorial Desk
Subdomain Setup: DNS, Routing, and HTTPS
Plan a subdomain as a complete public endpoint: choose the record, prepare host routing, account for DNS caches, and verify TLS and application behavior.
Practical reference library
Follow a hostname from idea to working HTTPS.
These guides focus on the handoffs where deployments usually fail: naming, DNS records, provider routing, cache timing, certificates, and the final public response.
- 01 Understand the DNS path
- 02 Connect a hosting platform
- 03 Keep public hostnames healthy
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15 guides available
01 · Foundations
Understand the DNS path
Start here if records, caching, local names, or the difference between a hostname and an application route are still fuzzy.
02
A Records and CNAME Records: Choosing a DNS Target
Compare direct IPv4 records with hostname aliases, including CNAME coexistence and zone-apex constraints, provider-specific alias features, and verification steps.
03
DNS Propagation: TTLs, Caches, and Verification
Understand why DNS answers differ after a change, how TTL and negative caching affect what resolvers return, and how to separate authoritative DNS from recursive and application issues.
04
cloudflare 1990Company Editorial Desk
Cloudflare DNS: Records, Proxy Status, and Verification
Configure a Cloudflare DNS record with an explicit target, proxy decision, accurate TTL expectations, and checks for both DNS and the public application path.
06
development 1990Company Editorial Desk
Local Development with Custom Domains
Use custom domains locally without turning your setup into a guessing game. This guide covers hosts files, local DNS, HTTPS, and when to use a real public subdomain.
02 · Publishing
Connect a hosting platform
Platform-specific walkthroughs for moving from a provider preview URL to a stable public hostname with HTTPS.
07
cloudflare 1990Company Editorial Desk
Cloudflare Pages Custom Domain Setup
Connect a Cloudflare Pages project to a custom subdomain, verify DNS, and avoid the routing mistakes that make a working deployment look broken.
08
hosting 1990Company Editorial Desk
Vercel Custom Domain DNS Setup
Point a Vercel project at a custom domain without confusing DNS ownership, project routing, HTTPS issuance, and redirect behavior.
09
hosting 1990Company Editorial Desk
GitHub Pages Custom Domain and HTTPS
Set a GitHub Pages custom domain, verify DNS, enable HTTPS, and avoid stale CNAME and certificate problems.
10
hosting 1990Company Editorial Desk
Netlify Custom Domain DNS Setup
Connect a Netlify site to a custom hostname, verify the active DNS record, and finish with a clean HTTPS rollout.
03 · Operations
Keep public hostnames healthy
Naming, wildcard behavior, certificate authorization, stable tunnels, and cleanup practices for a domain that has to last.
05
development 1990Company Editorial Desk
Tunnel URL vs. Stable Subdomain
Separate the public-name decision from the connectivity decision, compare current ngrok development domains with owned hostnames, and choose an appropriate route to a local or hosted service.
11
subdomains 1990Company Editorial Desk
Subdomain Naming Rules for Public Projects
Choose a public hostname with a purpose-owner-lifecycle worksheet, a practical naming rubric, and an expiry plan for previews and temporary environments.
12
Wildcard Subdomains: When to Use Them
Design wildcard DNS without confusing DNS reachability, application host routing, and the one-label coverage of TLS wildcard certificates.
13
CNAME Flattening Explained
Understand why the zone apex cannot be an ordinary CNAME, how flattening and provider Alias features synthesize address answers, and how to verify and roll back the real target.
14
CAA Records and Let's Encrypt
Configure CAA without accidentally blocking certificate renewal: trace inheritance, understand issuewild precedence, and test the exact CA and hostname set used by your platform.
15
operations 1990Company Editorial Desk
Public Subdomain Inventory and Cleanup Runbook
Build an owner-backed inventory of public hostnames, choose the correct keep, protect, redirect, or retire state, and verify cleanup without leaving broken DNS or stale search results behind.
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