What DNS does for a business
A domain can serve a website, receive email and verify several business platforms at the same time. DNS provides the records that direct those different requests. An A record identifies an IPv4 address, an AAAA record identifies an IPv6 address, and an MX record identifies a mail destination. TXT records often carry verification or email authentication information.
Nameservers identify where the authoritative records are managed. That provider can be different from the company supplying domain registration or website hosting. A DNS resolver also caches answers, so an updated record may not be visible everywhere immediately. Cloudflare explains the DNS lookup process.
Example: moving a website while keeping email
Imagine a business moving its WordPress website to a new server while retaining Microsoft 365. The website addresses need to change, but the Microsoft mail and authentication records may need to stay exactly as they are. Replacing the whole DNS zone with a hosting provider’s default template could interrupt incoming mail or remove verification for other tools.
A sensible migration starts with an export of the current zone and a list of each service using it. The change record should identify the specific entries to update, the expected result and the previous values needed to reverse the change.
Checks before and after a DNS change
Confirm access to the authoritative DNS account before scheduling work. Check the root domain, www address, mail destinations and any business subdomains separately. After making the change, verify the website certificate, submit a test enquiry and test incoming and outgoing mail.
Do not assume that a working homepage proves every DNS-dependent service is healthy. Equally, repeating a correct change will not force cached answers to expire. Record what was changed and when, then diagnose the affected service using its actual records.
Common questions about dns
Is DNS the same as hosting?
No. DNS directs requests towards services; hosting runs the website or application that answers them. They can be purchased together while remaining separate responsibilities.
Do I have to change nameservers when moving a website?
Not necessarily. If you can edit the existing authoritative records, updating the website destination may be enough. Confirm the new host’s requirements before changing the entire DNS provider.
Related definitions
- Domain name — A registered, human-readable internet name used to address services such as a website or business email. Ownership, renewal and account access should remain clear.
- Hosting — The infrastructure and services that make a website accessible online. Capacity, reliability, security, backups and support should match the site’s role in the business.
- Email deliverability — The ability of legitimate email to reach recipients successfully. Authentication, sender reputation, list quality and message practices all affect delivery.
- Microsoft 365 — Microsoft’s suite of productivity and collaboration services. A business setup needs deliberate licensing, identity protection, permissions, email configuration and support.
Related SEO guides
DNS changes can interrupt website access during a move; coordinate them with hosting, certificates and migration checks.
For help connecting these decisions with your website, explore our SEO services or start with an SEO audit.
Put it into practice
Explore our dns management service or talk with Refined IT about applying this to your website or business systems.