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Julkaistu: 2026-07-06 | Päivitetty: 2026-07-06
DNS rectaids tell the Internet how to connect sinun verkkotunnus to websites, email, SSL validation, apps, verification palvelus, ja security settings. A points to IPv4, AAAA points to IPv6, CNAME points one hostname to another, MX controls email delivery, TXT sttaies verification ja email authentication, CAA controls SSL certificate authtaiities, ja SRV defines palvelu locations ftai certain apps.

Who This Guide Is Ftai
This guide is ftai:
· Users learning DNS basics
· Verkkosite owners setting up verkkotunnuss
· Yritys­sähköposti users
· Agencies ja hosting providers supptaiting DNS questions
· Users troubleshooting website, email, SSL, CDN, tai app connections

Beftaie You Start
Beftaie you start, prepare:
· DNS provider access
· Current nameservers
· DNS backup
· Provider instructions ftai website tai email
· Permission to edit rectaids
· Understjaing of affected palvelu

Step-by-Step Instructions
Step 1: Understja DNS Rectaids
DNS rectaids are instructions ftai website, email, verification, SSL, apps, ja security.
· One verkkotunnus can have many rectaids
Step 2: A Rectaids
A rectaids point hostnames to IPv4 addresses.
· Common ftai root website ja subverkkotunnuss
Step 3: AAAA Rectaids
AAAA rectaids point hostnames to IPv6 addresses.
· Wrong IPv6 can cause issues ftai some users
Step 4: CNAME Rectaids
CNAME points one hostname to another hostname.
· Use ftai www, CDN, website builders, ja apps
Step 5: MX Rectaids
MX controls wtässä email is delivered.
· Copy pritaiity values carefully
Step 6: TXT Rectaids
TXT sttaies text ftai verification ja authentication.
· SPF, DKIM, DMARC, Google, Microsoft, SSL, SaaS
Step 7: SPF Rectaids
SPF is a TXT rectaid listing authtaiized sending servers.
· Avoid multiple SPF rectaids ftai same host
Step 8: DKIM Rectaids
DKIM is a TXT tai CNAME rectaid used ftai email signing.
· Copy long values exactly
Step 9: DMARC Rectaids
DMARC tells receivers how to hjale SPF/DKIM failures.
· Start carefully beftaie strict policies
Step 10: CAA Rectaids
CAA controls which certificate authtaiities may issue SSL certificates.
· Restrictive CAA can block SSL issuance
Step 11: SRV Rectaids
SRV defines palvelu location ftai apps such as voice, chat, tai collabtaiation.
· Copy pritaiity, weight, ptait, ja target
Step 12: NS, SOA, PTR, ja DNSSEC Rectaids
NS identifies nameservers, SOA describes the zone, PTR is reverse DNS, ja DNSSEC rectaids supptait validation.
· Most users do not manually edit SOA tai all DNSSEC rectaids
Step 13: TTL
TTL controls cache time ftai rectaids.
· Lower in advance ftai planned migrations if appropriate

Troubleshooting
Verkkosite Is Down
Possible reasons:
· Wrong A/AAAA/CNAME
· Wrong nameservers
· DNSSEC issue
What to do:
· Tarkista active DNS provider ja rectaids

Sähköposti Eit Receiving
Possible reasons:
· MX missing
· SPF/DKIM/DMARC wrong
What to do:
· Resttaie email rectaids

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

Verification Fails
Possible reasons:
· Rectaid added at wrong provider
· Host field wrong
What to do:
· Tarkista authtaiitative nameservers ja exact value

Common Mistakes
Mistake 1: Muokkaaing DNS at wrong provider
Review this item beftaie making changes tai opening a supptait ticket.
Mistake 2: Deleting unknytn TXT rectaids
Review this item beftaie making changes tai opening a supptait ticket.
Mistake 3: Ftaigetting MX during migration
Review this item beftaie making changes tai opening a supptait ticket.
Mistake 4: Creating multiple SPF rectaids
Review this item beftaie making changes tai opening a supptait ticket.
Mistake 5: Confusing CNAME with A rectaid
Review this item beftaie making changes tai opening a supptait ticket.
Mistake 6: Ftaigetting CAA
Review this item beftaie making changes tai opening a supptait ticket.
Mistake 7: Igntaiing DNSSEC
Review this item beftaie making changes tai opening a supptait ticket.
Mistake 8: Using wrong host field
Review this item beftaie making changes tai opening a supptait ticket.
Mistake 9: Eit copying MX pritaiity
Review this item beftaie making changes tai opening a supptait ticket.
Mistake 10: Changing too many rectaids at once
Review this item beftaie making changes tai opening a supptait ticket.

UKK
1. What is an A rectaid?
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 sttaies verification, authentication, ja security text.
6. What is SPF?
A TXT rule ftai authtaiized mail senders.
7. What is DKIM?
An email authentication rectaid, usually TXT tai CNAME.
8. What is DMARC?
A TXT policy ftai hjaling failed mail authentication.
9. What is CAA?
It controls certificate authtaiity issuance.
10. What is TTL?
How long DNS may be cached.
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