DNS Propagation Checker Έλεγχος Διάδοσης DNS

What is DNS Propagation?

When you change a DNS record (e.g. an A record for a new IP, MX for a new mail server, NS when switching DNS providers), the change does not become visible everywhere at once. Each DNS resolver in the world caches the old value for as long as the record's TTL (Time To Live) dictates — until that cache expires, it keeps returning the old answer.

The DNS Propagation Checker queries your domain simultaneously across 30+ resolvers in Europe, Americas, Asia and Africa, and shows how many already see the new value.

What do the colours mean?

• ✓ Green — the resolver returns the same value as the majority (consensus).
• ⚠ Yellow — the resolver returns a different value — it still has old cache.
• ✗ Red — the resolver returned no answer or timed out.

Record types you can check

A / AAAA

IPv4 / IPv6 address — the most common: migrating to a new server.

CNAME

Alias to another domain — useful for subdomains (www, mail, cdn).

MX

Mail server — verify that a mail hosting change has propagated.

NS

Nameservers — takes longer (12–48h) because TLD root servers must be updated.

TXT

SPF, DKIM, DMARC, domain verification. Fast propagation (follows TTL).

SOA

Zone serial number — useful to confirm a zone transfer completed.

CAA

Authorized Certificate Authorities — which CAs are allowed to issue SSL for this domain.

When to use this tool

• After changing an A record: see whether Europe and the Americas already resolve the new IP.
• After moving to a new DNS provider: check when the NS records have propagated globally.
• After configuring MX: confirm emails will be delivered to the new server.
• Troubleshooting: user A sees the new site, user B doesn't — here you can see why.

Cache duration

Results are cached for 30 seconds. Refresh the page for a fresh real-time check.