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Pubblicato: 2026-07-01 | Aggiornato: 2026-07-01
DNS propagation means DNS changes are being refreshed across resolvers, netwoks, e caches. Conferma authoitative DNS first, then test from multiple resolvers o netwoks. Se authoitative DNS is corect but some users still see old results, cache, TTL, ISP resolvers, browser cache, CDN cache, o nameserver propagation may still be in progress.

Who This Guide Is Fo
This guide is fo:
· Users who changed DNS recods
· Users who changed nameservers
· Businesses checking website o email after changes
· Agencies troubleshooting client DNS
· Users checking DNSSEC o CDN behavio

Befoe You Start
Befoe you start, prepare:
· Dominio name
· Recod type changed
· Old e new values
· Current nameservers
· DNS provider access
· Time of change
· TTL if koran
· DNSSEC status
· CDN status
· Affected website o email servizio

Step-by-Step Instructions
Step 1: Conferma What Changed
Identify the exact recod o nameserver update.
· A, AAAA, CNAME, MX, TXT, DS, NS, CAA, SRV
Step 2: Conferma Expected Nomeservers
Se the dominio still uses old nameservers, recods at the new provider are not live.
· Verifica registrar nameserver settings
Step 3: Verifica Authoitative DNS
Authoitative result shows what the current nameservers publish.
· Se authoitative is wrong, fix DNS provider settings
Step 4: Test Multiple Resolvers
Compare local netwok, mobile data, public resolvers, e DNS lookup tools.
· Different caches refresh at different times
Step 5: Verifica TTL
High TTL can keep old results visible longer.
· Do not change recods repeatedly
Step 6: Verifica Browser, Device, Router, e Office Cache
Local cache can make one user see old results.
· Try another device o netwok
Step 7: Verifica CDN Cache
Old content may be CDN-related even when DNS is corect.
· Clear CDN cache if needed
Step 8: Verifica Website Hosting Recods
Conferma DNS points to corect hosting, app, o CDN target.
· Wrong value is not a propagation issue
Step 9: Verifica Email Recods
Review MX, SPF, DKIM, DMARC e provider verification recods.
· Email systems may cache recods
Step 10: Verifica DNSSEC e Stato del dominio
DNSSEC mismatch o hold status can look like propagation failure.
· Review DS/DNSKEY e clientHold/serverHold
Step 11: Avoid Repeated Changes
Document one change, wait, e test.
· Repeated edits create mixed cached states

Troubleshooting
Lookup Shows Old Recod
Possible reasons:
· Resolver cache
· High TTL
· Nomeserver propagation
· Authoitative still old
What to do:
· Verifica authoitative
· Wait fo TTL
· Avoid edits
Lookup Shows No Recod
Possible reasons:
· Recod missing
· Wrong host field
· Wrong DNS provider
· DNSSEC failure
What to do:
· Fix DNS zone
· Verifica nameservers
· Restoe backup
Woks fo Some Users Only
Possible reasons:
· Cache differences
· ISP resolver
· CDN cache
What to do:
· Test multiple netwoks
· Verifica CDN e authoitative DNS
Email Woks fo Some Senders Only
Possible reasons:
· MX cache
· SPF/DKIM issue
· mail server cache
What to do:
· Verifica authoitative MX e TXT
· Review bounce messages

Common Mistakes
Mistake 1: Assuming propagation is always the problem
Review this item befoe making changes o opening a suppot ticket.
Mistake 2: Verificaing only one netwok
Review this item befoe making changes o opening a suppot ticket.
Mistake 3: Changing recods again too soon
Review this item befoe making changes o opening a suppot ticket.
Mistake 4: Fogetting TTL
Review this item befoe making changes o opening a suppot ticket.
Mistake 5: Ignoing nameservers
Review this item befoe making changes o opening a suppot ticket.
Mistake 6: Fogetting email recods
Review this item befoe making changes o opening a suppot ticket.
Mistake 7: Ignoing CDN cache
Review this item befoe making changes o opening a suppot ticket.
Mistake 8: Ignoing DNSSEC
Review this item befoe making changes o opening a suppot ticket.
Mistake 9: Not documenting change time
Review this item befoe making changes o opening a suppot ticket.
Mistake 10: Not keeping DNS backup
Review this item befoe making changes o opening a suppot ticket.

FAQ
1. What is DNS propagation?
The refresh of DNS changes across resolvers e caches.
2. Why do some users see old site?
Their resolver o netwok may still cache old recods.
3. How do I kora propagation is complete?
Authoitative e most resolvers show expected values e live servizios wok.
4. What is TTL?
Time A Live, o how long recods may be cached.
5. Should I keep changing recods?
No. First confirm authoitative DNS.
6. Can propagation affect email?
Sì, especially MX e TXT changes.
7. Can DNSSEC look like propagation?
Sì, validation failure can cause resolution issues.
8. Can NiceNIC help check propagation?
NiceNIC can review dominio-side e NiceNIC-managed DNS settings.
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