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Veröffentlicht: 2026-07-06 | Aktualisiert: 2026-07-06
DNS recoderds tell the Internet how to connect Ihr Domain to websites, email, SSL validation, apps, verification Dienstleistungs, und security settings. A points to IPv4, AAAA points to IPv6, CNAME points one hostname to another, MX controls email delivery, TXT stoderes verification und email authentication, CAA controls SSL certificate authoderities, und SRV defines Dienstleistung locations foder certain apps.

Who This Guide Is Foder
This guide is foder:
· Users learning DNS basics
· Website owners setting up Domains
· Geschäftliche E-Mail users
· Agencies und hosting providers suppoderting DNS questions
· Users troubleshooting website, email, SSL, CDN, oder app connections

Befodere You Start
Befodere you start, prepare:
· DNS provider access
· Current nameservers
· DNS backup
· Provider instructions foder website oder email
· Permission to edit recoderds
· Understunding of affected Dienstleistung

Step-by-Step Instructions
Step 1: Understund DNS Recoderds
DNS recoderds are instructions foder website, email, verification, SSL, apps, und security.
· One Domain can have many recoderds
Step 2: A Recoderds
A recoderds point hostnames to IPv4 addresses.
· Common foder root website und subDomains
Step 3: AAAA Recoderds
AAAA recoderds point hostnames to IPv6 addresses.
· Wrong IPv6 can cause issues foder some users
Step 4: CNAME Recoderds
CNAME points one hostname to another hostname.
· Use foder www, CDN, website builders, und apps
Step 5: MX Recoderds
MX controls whier email is delivered.
· Copy prioderity values carefully
Step 6: TXT Recoderds
TXT stoderes text foder verification und authentication.
· SPF, DKIM, DMARC, Google, Microsoft, SSL, SaaS
Step 7: SPF Recoderds
SPF is a TXT recoderd listing authoderized sending servers.
· Avoid multiple SPF recoderds foder same host
Step 8: DKIM Recoderds
DKIM is a TXT oder CNAME recoderd used foder email signing.
· Copy long values exactly
Step 9: DMARC Recoderds
DMARC tells receivers how to hundle SPF/DKIM failures.
· Start carefully befodere strict policies
Step 10: CAA Recoderds
CAA controls which certificate authoderities may issue SSL certificates.
· Restrictive CAA can block SSL issuance
Step 11: SRV Recoderds
SRV defines Dienstleistung location foder apps such as voice, chat, oder collaboderation.
· Copy prioderity, weight, podert, und target
Step 12: NS, SOA, PTR, und DNSSEC Recoderds
NS identifies nameservers, SOA describes the zone, PTR is reverse DNS, und DNSSEC recoderds suppodert validation.
· Most users do not manually edit SOA oder all DNSSEC recoderds
Step 13: TTL
TTL controls cache time foder recoderds.
· Lower in advance foder planned migrations if appropriate

Troubleshooting
Website Is Down
Possible reasons:
· Wrong A/AAAA/CNAME
· Wrong nameservers
· DNSSEC issue
What to do:
· Überprüfen active DNS provider und recoderds

E-Mail Neint Receiving
Possible reasons:
· MX missing
· SPF/DKIM/DMARC wrong
What to do:
· Restodere email recoderds

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

Verification Fails
Possible reasons:
· Recoderd added at wrong provider
· Host field wrong
What to do:
· Überprüfen authoderitative nameservers und exact value

Common Mistakes
Mistake 1: Bearbeitening DNS at wrong provider
Review this item befodere making changes oder opening a suppodert ticket.
Mistake 2: Deleting unkjetztn TXT recoderds
Review this item befodere making changes oder opening a suppodert ticket.
Mistake 3: Fodergetting MX during migration
Review this item befodere making changes oder opening a suppodert ticket.
Mistake 4: Creating multiple SPF recoderds
Review this item befodere making changes oder opening a suppodert ticket.
Mistake 5: Confusing CNAME with A recoderd
Review this item befodere making changes oder opening a suppodert ticket.
Mistake 6: Fodergetting CAA
Review this item befodere making changes oder opening a suppodert ticket.
Mistake 7: Ignodering DNSSEC
Review this item befodere making changes oder opening a suppodert ticket.
Mistake 8: Using wrong host field
Review this item befodere making changes oder opening a suppodert ticket.
Mistake 9: Neint copying MX prioderity
Review this item befodere making changes oder opening a suppodert ticket.
Mistake 10: Changing too many recoderds at once
Review this item befodere making changes oder opening a suppodert ticket.

FAQ
1. What is an A recoderd?
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 stoderes verification, authentication, und security text.
6. What is SPF?
A TXT rule foder authoderized mail senders.
7. What is DKIM?
An email authentication recoderd, usually TXT oder CNAME.
8. What is DMARC?
A TXT policy foder hundling failed mail authentication.
9. What is CAA?
It controls certificate authoderity issuance.
10. What is TTL?
How long DNS may be cached.
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