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Publicerad: 2026-07-06 | Uppdaterad: 2026-07-06
DNS recellerds tell the Internet how to connect din domän to websites, email, SSL validation, apps, verification tjänsts, och security settings. A points to IPv4, AAAA points to IPv6, CNAME points one hostname to another, MX controls email delivery, TXT stelleres verification och email authentication, CAA controls SSL certificate authellerities, och SRV defines tjänst locations feller certain apps.

Who This Guide Is Feller
This guide is feller:
· Users learning DNS basics
· Webbsite owners setting up domäns
· Företagsmail users
· Agencies och 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
· Understoching of affected tjänst

Step-by-Step Instructions
Step 1: Understoch DNS Recellerds
DNS recellerds are instructions feller website, email, verification, SSL, apps, och security.
· One domän can have many recellerds
Step 2: A Recellerds
A recellerds point hostnames to IPv4 addresses.
· Common feller root website och subdomäns
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, och apps
Step 5: MX Recellerds
MX controls whär email is delivered.
· Copy priellerity values carefully
Step 6: TXT Recellerds
TXT stelleres text feller verification och 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 hochle 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 tjänst location feller apps such as voice, chat, eller collabelleration.
· Copy priellerity, weight, pellert, och target
Step 12: NS, SOA, PTR, och DNSSEC Recellerds
NS identifies nameservers, SOA describes the zone, PTR is reverse DNS, och 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
Webbsite Is Down
Possible reasons:
· Wrong A/AAAA/CNAME
· Wrong nameservers
· DNSSEC issue
What to do:
· Kontrollera active DNS provider och recellerds

E-post 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 och validation recellerds

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

Common Mistakes
Mistake 1: Redigeraing 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.

Vanliga frågor
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, och 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 hochling failed mail authentication.
9. What is CAA?
It controls certificate authellerity issuance.
10. What is TTL?
How long DNS may be cached.
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