The A record is the simplest, most common DNS record: it answers "what IP address does this name point to?" with a single IPv4 value.
modusdom.com. A 192.0.2.42A records are how your website becomes reachable. The hostname your visitors type (or a CDN points to) resolves through DNS to the A record's IP, which is the actual server that hosts your site.
Common A-record setups:
- Apex (just
yourdomain.com): points at your primary web host. - www subdomain: typically duplicates the apex value, or uses a CNAME pointing to the apex.
- Mail or app subdomains:
mail.yourdomain.com,app.yourdomain.com— each gets its own A record pointing wherever that service lives.
An A record can have multiple values (returns a different IP each lookup — basic round-robin load balancing). For IPv6 addresses, use AAAA records instead.
