What it is
The "phone book" of the internet — it turns a readable site name (devunit-lab.ru) into the numeric server address the request actually goes to.
How we use it
We configure DNS records when moving a site or setting up email on a domain — without it, the right address simply leads nowhere.
Where DNS matters to a business
- The site moves to a new server, and the address must lead there without downtime.
- Domain mail must reach customers rather than land in spam.
- The site needs to be verified in search engines' webmaster tools.
- The domain must work even when the server cannot pass the usual certificate check.
How we use it
- Mail records. For your own domain mail we set up MX, SPF, DKIM, DMARC and a reverse PTR record for the IP address: without them messages do not arrive or land in spam.
- DNS validation. The demo host for the packaging manufacturer's sites cannot answer an HTTP check, so its certificate is issued by proving ownership with a DNS record (DNS-01).
- Domains by role. On the VPN route one domain carries traffic, another serves subscriptions, and the admin panel is not on a public domain at all. If the first is blocked, the client refreshes its subscription through the second.
- Verification in webmaster tools. Verification records for Google Search Console and Bing go into the client's domain DNS.
Common problems
- Every domain on one IP. Splitting domains by role does not help if they all point to one address: a block by IP takes them all down. This limit of the design is written down among its limitations.
- No PTR. The reverse record is set by the hosting provider, not the domain owner, and it is often forgotten.
- Changes are not instant. New records take time to spread across the internet, so a move has to be planned ahead.
When you do not need it
A site owner does not have to understand records themselves: what matters is that the domain is registered to you and you have access to its control panel. We set up the records when moving a site or connecting mail.