Domains, DNS & SEO for Hosting Projects
DNS is the internet's address book. Understanding it gives you control over how your website is found, reached, and ranked by search engines.
DNS Records You Need to Know
Every domain is connected to its server via DNS records stored on nameservers. The A record points a domain to an IPv4 address. The AAAA record does the same for IPv6. Getting these right is the first step in any hosting setup.
CNAME records create aliases, pointing one subdomain to another hostname. They are commonly used to connect a www subdomain to a root domain or to point custom subdomains at third-party services.
MX records control where email for your domain is delivered. A misconfigured MX record means lost emails. Always double-check MX priority values and test with an MX lookup tool after any changes.
Essential DNS Record Types
A Record
Maps a hostname to an IPv4 address. This is the most fundamental DNS record for any website.
CNAME Record
Creates an alias from one name to another. Useful for subdomains pointing to external services.
MX Record
Defines which servers handle email for the domain. Priority values determine the preferred server.
TXT Record
Stores arbitrary text. Used for SPF, DKIM, DMARC, and domain ownership verification.
TTL and Propagation: What to Expect
TTL (Time to Live) tells resolvers how long to cache a DNS record before checking again. A low TTL of 300 seconds is useful before a planned server migration because changes propagate quickly. A high TTL of 86400 seconds reduces DNS query load during stable operation.
Before migrating a site to a new server, lower the TTL of all affected records to 300 seconds. Wait 24 to 48 hours for the old high TTL to expire everywhere. Then make the IP change and observe fast propagation worldwide.
DNS propagation is not instant even with a low TTL. Some resolvers cache aggressively and ignore short TTLs. Plan for up to two hours of partial propagation during any major DNS change.
How Server Location and Speed Affect SEO
Google uses Core Web Vitals as a ranking signal, and server response time is a direct input to that score. A slow server produces a high Time to First Byte (TTFB), which drags down Largest Contentful Paint and overall page scores.
Server location matters most for sites targeting a specific geographic audience. A German e-commerce site hosted in Frankfurt will consistently outperform the same site hosted in Los Angeles for German visitors. If your audience is global, a CDN offsets the location disadvantage of a single origin server.
TTFB and Core Web Vitals
Keep TTFB below 200ms for a good score. Server caching and a CDN are the most effective levers.
Geo-Targeting
Google Search Console allows you to set a geographic target for sites with generic TLDs like .com or .net.
HTTPS is Required
Google has used HTTPS as a ranking signal since 2014. A missing SSL certificate harms both security and SEO.
Uptime Affects Crawling
Frequent downtime causes Googlebot to reduce crawl frequency, delaying indexing of new content.
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