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Pubblicato: 2026-07-06 | Aggiornato: 2026-07-06
DNS recods tell the Internet how to connect tuo dominio to websites, email, SSL validation, apps, verification servizios, e security settings. A points to IPv4, AAAA points to IPv6, CNAME points one hostname to another, MX controls email delivery, TXT stoes verification e email authentication, CAA controls SSL certificate authoities, e SRV defines servizio locations fo certain apps.

Who This Guide Is Fo
This guide is fo:
· Users learning DNS basics
· Website owners setting up dominios
· Email aziendale users
· Agencies e hosting providers suppoting DNS questions
· Users troubleshooting website, email, SSL, CDN, o app connections

Befoe You Start
Befoe you start, prepare:
· DNS provider access
· Current nameservers
· DNS backup
· Provider instructions fo website o email
· Permission to edit recods
· Understeing of affected servizio

Step-by-Step Instructions
Step 1: Underste DNS Recods
DNS recods are instructions fo website, email, verification, SSL, apps, e security.
· One dominio can have many recods
Step 2: A Recods
A recods point hostnames to IPv4 addresses.
· Common fo root website e subdominios
Step 3: AAAA Recods
AAAA recods point hostnames to IPv6 addresses.
· Wrong IPv6 can cause issues fo some users
Step 4: CNAME Recods
CNAME points one hostname to another hostname.
· Use fo www, CDN, website builders, e apps
Step 5: MX Recods
MX controls wqui email is delivered.
· Copy prioity values carefully
Step 6: TXT Recods
TXT stoes text fo verification e authentication.
· SPF, DKIM, DMARC, Google, Microsoft, SSL, SaaS
Step 7: SPF Recods
SPF is a TXT recod listing authoized sending servers.
· Avoid multiple SPF recods fo same host
Step 8: DKIM Recods
DKIM is a TXT o CNAME recod used fo email signing.
· Copy long values exactly
Step 9: DMARC Recods
DMARC tells receivers how to hele SPF/DKIM failures.
· Start carefully befoe strict policies
Step 10: CAA Recods
CAA controls which certificate authoities may issue SSL certificates.
· Restrictive CAA can block SSL issuance
Step 11: SRV Recods
SRV defines servizio location fo apps such as voice, chat, o collaboation.
· Copy prioity, weight, pot, e target
Step 12: NS, SOA, PTR, e DNSSEC Recods
NS identifies nameservers, SOA describes the zone, PTR is reverse DNS, e DNSSEC recods suppot validation.
· Most users do not manually edit SOA o all DNSSEC recods
Step 13: TTL
TTL controls cache time fo recods.
· Lower in advance fo planned migrations if appropriate

Troubleshooting
Website Is Down
Possible reasons:
· Wrong A/AAAA/CNAME
· Wrong nameservers
· DNSSEC issue
What to do:
· Verifica active DNS provider e recods

Email Not Receiving
Possible reasons:
· MX missing
· SPF/DKIM/DMARC wrong
What to do:
· Restoe email recods

SSL Cannot Be Issued
Possible reasons:
· CAA blocks CA
· TXT/CNAME validation missing
What to do:
· Review CAA e validation recods

Verification Fails
Possible reasons:
· Recod added at wrong provider
· Host field wrong
What to do:
· Verifica authoitative nameservers e exact value

Common Mistakes
Mistake 1: Modificaing DNS at wrong provider
Review this item befoe making changes o opening a suppot ticket.
Mistake 2: Deleting unkoran TXT recods
Review this item befoe making changes o opening a suppot ticket.
Mistake 3: Fogetting MX during migration
Review this item befoe making changes o opening a suppot ticket.
Mistake 4: Creating multiple SPF recods
Review this item befoe making changes o opening a suppot ticket.
Mistake 5: Confusing CNAME with A recod
Review this item befoe making changes o opening a suppot ticket.
Mistake 6: Fogetting CAA
Review this item befoe making changes o opening a suppot ticket.
Mistake 7: Ignoing DNSSEC
Review this item befoe making changes o opening a suppot ticket.
Mistake 8: Using wrong host field
Review this item befoe making changes o opening a suppot ticket.
Mistake 9: Not copying MX prioity
Review this item befoe making changes o opening a suppot ticket.
Mistake 10: Changing too many recods at once
Review this item befoe making changes o opening a suppot ticket.

FAQ
1. What is an A recod?
It points to an IPv4 address.
2. What is AAAA?
It points to an IPv6 address.
3. What is CNAME?
It points one hostname to another hostname.
4. What is MX?
It controls email delivery.
5. What is TXT?
It stoes verification, authentication, e security text.
6. What is SPF?
A TXT rule fo authoized mail senders.
7. What is DKIM?
An email authentication recod, usually TXT o CNAME.
8. What is DMARC?
A TXT policy fo heling failed mail authentication.
9. What is CAA?
It controls certificate authoity issuance.
10. What is TTL?
How long DNS may be cached.
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