Understanding DNS: Domain Configuration for Web Projects
Last updated: March 2026 · Reading time: 5 minutes
Every website has an IP address. Since humans struggle to remember number sequences like 134.119.39.85, the Domain Name System was developed in 1983. DNS translates readable addresses like arocom.de into the corresponding IP address — and vice versa.
Structure of a DNS Address
A DNS address like www.arocom.de consists of three parts, read from right to left: the Top Level Domain (TLD) "de" forms the first hierarchy level. "arocom" is the Second Level Domain (SLD). "www" is the subdomain.
During registration, a nameserver is specified to manage the domain. When an address is accessed, the browser checks its own cache, the operating system cache, the router cache, and the ISP cache in sequence. Only when none of these caches returns a result does a query chain through root servers and TLD nameservers begin.
DNS Configuration for Drupal Projects
Several DNS entries are relevant for Drupal projects: A records and AAAA records for IPv4 and IPv6, CNAME records for subdomains, MX records for email, and TXT records for SPF, DKIM, and DMARC. Incorrect DNS entries lead to outages, email delivery problems, or security vulnerabilities.
arocom handles DNS configuration as part of hosting and operations and ensures correct TTL values, redirects, and SSL certificates.
DNS Problems with Your Website?
The Future Check reviews your DNS configuration, SSL setup, and server setup.
What happens with incorrect DNS configuration?
Your website is unreachable, emails do not arrive or land in spam, and SSL certificates cannot be issued. DNS errors are often the cause of perceived server problems.
How long does a DNS change take?
DNS changes propagate worldwide within minutes to 48 hours. The duration depends on the TTL value (Time to Live) set on the old DNS entries.
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