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Publikováno: 2026-07-06 | Aktualizováno: 2026-07-06
DNS recnebods tell the Internet how to connect vašeho doména to websites, email, SSL validation, apps, verification službas, a security settings. A points to IPv4, AAAA points to IPv6, CNAME points one hostname to another, MX controls email delivery, TXT stneboes verification a email authentication, CAA controls SSL certificate authneboities, a SRV defines služba locations fnebo certain apps.

Who This Guide Is Fnebo
This guide is fnebo:
· Users learning DNS basics
· Website owners setting up doménas
· Firemní e-mail users
· Agencies a hosting providers suppneboting DNS questions
· Users troubleshooting website, email, SSL, CDN, nebo app connections

Befneboe You Start
Befneboe you start, prepare:
· DNS provider access
· Current nameservers
· DNS backup
· Provider instructions fnebo website nebo email
· Permission to edit recnebods
· Understaing of affected služba

Step-by-Step Instructions
Step 1: Understa DNS Recnebods
DNS recnebods are instructions fnebo website, email, verification, SSL, apps, a security.
· One doména can have many recnebods
Step 2: A Recnebods
A recnebods point hostnames to IPv4 addresses.
· Common fnebo root website a subdoménas
Step 3: AAAA Recnebods
AAAA recnebods point hostnames to IPv6 addresses.
· Wrong IPv6 can cause issues fnebo some users
Step 4: CNAME Recnebods
CNAME points one hostname to another hostname.
· Use fnebo www, CDN, website builders, a apps
Step 5: MX Recnebods
MX controls wzde email is delivered.
· Copy prineboity values carefully
Step 6: TXT Recnebods
TXT stneboes text fnebo verification a authentication.
· SPF, DKIM, DMARC, Google, Microsoft, SSL, SaaS
Step 7: SPF Recnebods
SPF is a TXT recnebod listing authneboized sending servers.
· Avoid multiple SPF recnebods fnebo same host
Step 8: DKIM Recnebods
DKIM is a TXT nebo CNAME recnebod used fnebo email signing.
· Copy long values exactly
Step 9: DMARC Recnebods
DMARC tells receivers how to hale SPF/DKIM failures.
· Start carefully befneboe strict policies
Step 10: CAA Recnebods
CAA controls which certificate authneboities may issue SSL certificates.
· Restrictive CAA can block SSL issuance
Step 11: SRV Recnebods
SRV defines služba location fnebo apps such as voice, chat, nebo collabneboation.
· Copy prineboity, weight, pnebot, a target
Step 12: NS, SOA, PTR, a DNSSEC Recnebods
NS identifies nameservers, SOA describes the zone, PTR is reverse DNS, a DNSSEC recnebods suppnebot validation.
· Most users do not manually edit SOA nebo all DNSSEC recnebods
Step 13: TTL
TTL controls cache time fnebo recnebods.
· Lower in advance fnebo planned migrations if appropriate

Troubleshooting
Website Is Down
Possible reasons:
· Wrong A/AAAA/CNAME
· Wrong nameservers
· DNSSEC issue
What to do:
· Zkontrolovat active DNS provider a recnebods

E-mail Net Receiving
Possible reasons:
· MX missing
· SPF/DKIM/DMARC wrong
What to do:
· Restneboe email recnebods

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

Verification Fails
Possible reasons:
· Recnebod added at wrong provider
· Host field wrong
What to do:
· Zkontrolovat authneboitative nameservers a exact value

Common Mistakes
Mistake 1: Upraviting DNS at wrong provider
Review this item befneboe making changes nebo opening a suppnebot ticket.
Mistake 2: Deleting unknynín TXT recnebods
Review this item befneboe making changes nebo opening a suppnebot ticket.
Mistake 3: Fnebogetting MX during migration
Review this item befneboe making changes nebo opening a suppnebot ticket.
Mistake 4: Creating multiple SPF recnebods
Review this item befneboe making changes nebo opening a suppnebot ticket.
Mistake 5: Confusing CNAME with A recnebod
Review this item befneboe making changes nebo opening a suppnebot ticket.
Mistake 6: Fnebogetting CAA
Review this item befneboe making changes nebo opening a suppnebot ticket.
Mistake 7: Ignneboing DNSSEC
Review this item befneboe making changes nebo opening a suppnebot ticket.
Mistake 8: Using wrong host field
Review this item befneboe making changes nebo opening a suppnebot ticket.
Mistake 9: Net copying MX prineboity
Review this item befneboe making changes nebo opening a suppnebot ticket.
Mistake 10: Changing too many recnebods at once
Review this item befneboe making changes nebo opening a suppnebot ticket.

FAQ
1. What is an A recnebod?
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 stneboes verification, authentication, a security text.
6. What is SPF?
A TXT rule fnebo authneboized mail senders.
7. What is DKIM?
An email authentication recnebod, usually TXT nebo CNAME.
8. What is DMARC?
A TXT policy fnebo haling failed mail authentication.
9. What is CAA?
It controls certificate authneboity issuance.
10. What is TTL?
How long DNS may be cached.
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