DNS diagram showing how domain names resolve to IP addresses and servers

Domain Management

DNS Explained: What Every Domain Owner Needs to Know

Domain 360 Team

·May 4, 2026·8 min read

When you type a domain name into your browser, the browser needs to look up the domain's address — the numeric IP address of the server where the website is hosted. Understanding DNS is especially important when you transfer a domain between registrars. The Domain Name System, or DNS, is the infrastructure that performs this lookup. Understanding DNS is practically useful for every domain owner because most "website is down" problems are DNS configuration issues.

Quick answer: DNS translates your domain name into the server address where your website lives. Understanding the basics prevents hours of troubleshooting and avoids costly configuration mistakes.

What Are the Key DNS Record Types?

A record: Points your domain to an IPv4 IP address. This is what makes a domain resolve to your web server.

AAAA record: Same as A record but for IPv6 addresses.

CNAME record: Points one domain or subdomain to another domain name. Commonly used for www pointing to the root domain, or connecting subdomains to external services.

MX record: Tells email servers where to deliver email for your domain. Without correct MX records, email to your domain cannot be delivered.

TXT record: Contains text information, used for email authentication (SPF, DKIM), domain ownership verification, and connecting third-party services.

NS record: Specifies which DNS servers are authoritative for your domain. Set at your registrar.

Do You Need to Understand DNS If You Use a Website Builder?

Mostly no, day to day — platforms like Squarespace, Wix, and Shopify handle DNS configuration internally once you point your domain at them, usually through a short setup wizard that adds the correct records for you. Where it still matters is at three specific moments: connecting a domain you bought elsewhere to the platform (you'll be given exact A or CNAME records to add at your registrar), setting up custom email on that domain (MX records are rarely handled by the website builder itself), and diagnosing why something isn't working, since "just follow the wizard" support articles tend to fall apart the moment a record doesn't match what's expected. Knowing the basics here is the difference between fixing a broken connection in five minutes and opening a support ticket and waiting two days.

How Does DNS Propagation Actually Work?

When you make a DNS change, it does not take effect immediately everywhere. DNS servers cache records for a period specified by the TTL (Time to Live) value. Propagation typically completes within one to three hours for TTL values of 3600 seconds, and up to 48 hours for TTL values of 86400 seconds.

Practical tip: if you are planning a website migration, reduce the TTL to 300 seconds 24 hours before the migration. This minimizes propagation delay when you point the domain to the new server.

How Do You Use a DNS Lookup Tool?

Domain 360's WHOIS tool at domain360.site/whois includes a DNS Lookup tab showing all DNS records for any domain. Use it to verify DNS changes have propagated, check competitor infrastructure, diagnose email delivery issues by examining MX records, and verify domain ownership through TXT records.

What Are the Common DNS Mistakes That Cause Outages?

The most frequent DNS error is editing the wrong record type — changing an A record when the intent was to update a CNAME, or vice versa — which silently breaks resolution for a subdomain or the whole site. Second most common: forgetting that changes are not instant. Teams sometimes make a DNS change, see no effect after five minutes, panic, and make a second conflicting change on top of the first — compounding the problem instead of just waiting out the TTL. Third: deleting an MX record while "cleaning up" DNS zones, which stops all inbound email silently, often unnoticed for days since outbound email typically keeps working through the same misconfiguration. Before making any DNS change to a live domain, note the current records first (a quick lookup and screenshot takes thirty seconds) so you have something to revert to if the change does not behave as expected.

Quick Answers

Why isn't my DNS change showing up yet?

The most common cause is browser or OS-level DNS caching combined with a TTL that hasn't expired yet. Flush your local DNS cache first, then check the record directly with a DNS lookup tool rather than refreshing your browser, since your browser may be reading a cached result that has nothing to do with the actual current record.

What is a SOA record?

The Start of Authority (SOA) record contains administrative information about a DNS zone — the primary nameserver, an admin contact, and timing values that control how often secondary nameservers refresh their copy of the zone. Most domain owners never need to edit it directly, but it exists on every domain.

Can I have multiple A records for the same domain?

Yes. Multiple A records pointing to different IP addresses is a basic form of load balancing and redundancy — DNS will return one of the addresses (often rotating between them) for each lookup, spreading traffic across multiple servers.

Do I need both an A record and a CNAME for the same subdomain?

No — a subdomain should have either an A record or a CNAME, not both. Having both configured causes a conflict, and most DNS providers will reject the second record or produce unpredictable resolution behavior.

Never lose a domain again

Track every domain you own in one dashboard. Free for up to 15 domains.