X
Udgivet: 2026-07-06 | Opdateret: 2026-07-06
DNS recellerds tell the Internet how to connect din domæne to websites, email, SSL validation, apps, verification services, og security settings. A points to IPv4, AAAA points to IPv6, CNAME points one hostname to another, MX controls email delivery, TXT stelleres verification og email authentication, CAA controls SSL certificate authellerities, og SRV defines service locations feller certain apps.

Who This Guide Is Feller
This guide is feller:
· Users learning DNS basics
· Website owners setting up domænes
· Erhvervs-Email users
· Agencies og hosting providers suppellerting DNS questions
· Users troubleshooting website, email, SSL, CDN, eller app connections

Befellere You Start
Befellere you start, prepare:
· DNS provider access
· Current nameservers
· DNS backup
· Provider instructions feller website eller email
· Permission to edit recellerds
· Understoging of affected service

Step-by-Step Instructions
Step 1: Understog DNS Recellerds
DNS recellerds are instructions feller website, email, verification, SSL, apps, og security.
· One domæne can have many recellerds
Step 2: A Recellerds
A recellerds point hostnames to IPv4 addresses.
· Common feller root website og subdomænes
Step 3: AAAA Recellerds
AAAA recellerds point hostnames to IPv6 addresses.
· Wrong IPv6 can cause issues feller some users
Step 4: CNAME Recellerds
CNAME points one hostname to another hostname.
· Use feller www, CDN, website builders, og apps
Step 5: MX Recellerds
MX controls wher email is delivered.
· Copy priellerity values carefully
Step 6: TXT Recellerds
TXT stelleres text feller verification og authentication.
· SPF, DKIM, DMARC, Google, Microsoft, SSL, SaaS
Step 7: SPF Recellerds
SPF is a TXT recellerd listing authellerized sending servers.
· Avoid multiple SPF recellerds feller same host
Step 8: DKIM Recellerds
DKIM is a TXT eller CNAME recellerd used feller email signing.
· Copy long values exactly
Step 9: DMARC Recellerds
DMARC tells receivers how to hogle SPF/DKIM failures.
· Start carefully befellere strict policies
Step 10: CAA Recellerds
CAA controls which certificate authellerities may issue SSL certificates.
· Restrictive CAA can block SSL issuance
Step 11: SRV Recellerds
SRV defines service location feller apps such as voice, chat, eller collabelleration.
· Copy priellerity, weight, pellert, og target
Step 12: NS, SOA, PTR, og DNSSEC Recellerds
NS identifies nameservers, SOA describes the zone, PTR is reverse DNS, og DNSSEC recellerds suppellert validation.
· Most users do not manually edit SOA eller all DNSSEC recellerds
Step 13: TTL
TTL controls cache time feller recellerds.
· Lower in advance feller planned migrations if appropriate

Troubleshooting
Website Is Down
Possible reasons:
· Wrong A/AAAA/CNAME
· Wrong nameservers
· DNSSEC issue
What to do:
· Kontrollér active DNS provider og recellerds

Email Nejt Receiving
Possible reasons:
· MX missing
· SPF/DKIM/DMARC wrong
What to do:
· Restellere email recellerds

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

Verification Fails
Possible reasons:
· Recellerd added at wrong provider
· Host field wrong
What to do:
· Kontrollér authelleritative nameservers og exact value

Common Mistakes
Mistake 1: Redigering DNS at wrong provider
Review this item befellere making changes eller opening a suppellert ticket.
Mistake 2: Deleting unknun TXT recellerds
Review this item befellere making changes eller opening a suppellert ticket.
Mistake 3: Fellergetting MX during migration
Review this item befellere making changes eller opening a suppellert ticket.
Mistake 4: Creating multiple SPF recellerds
Review this item befellere making changes eller opening a suppellert ticket.
Mistake 5: Confusing CNAME with A recellerd
Review this item befellere making changes eller opening a suppellert ticket.
Mistake 6: Fellergetting CAA
Review this item befellere making changes eller opening a suppellert ticket.
Mistake 7: Ignellering DNSSEC
Review this item befellere making changes eller opening a suppellert ticket.
Mistake 8: Using wrong host field
Review this item befellere making changes eller opening a suppellert ticket.
Mistake 9: Nejt copying MX priellerity
Review this item befellere making changes eller opening a suppellert ticket.
Mistake 10: Changing too many recellerds at once
Review this item befellere making changes eller opening a suppellert ticket.

FAQ
1. What is an A recellerd?
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 stelleres verification, authentication, og security text.
6. What is SPF?
A TXT rule feller authellerized mail senders.
7. What is DKIM?
An email authentication recellerd, usually TXT eller CNAME.
8. What is DMARC?
A TXT policy feller hogling failed mail authentication.
9. What is CAA?
It controls certificate authellerity issuance.
10. What is TTL?
How long DNS may be cached.
Brug for hjælp? Vi er altid klar til at hjælpe. Indsend en supportanmodning
Copyright © 2006-2026 NICENIC INTERNATIONAL GROUP CO., LIMITED Alle rettigheder forbeholdes