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DNS Propagation Checker

Ask 14 public DNS resolvers at once and see which already return your new record.

About DNS Propagation Checker

After a server move, a name server switch or an MX record change, some visitors keep reaching the old address for a while. The DNS propagation checker shows how far the change has got by asking 14 public resolvers at the same time: Google, Cloudflare, Cisco OpenDNS, NextDNS, Control D, AdGuard, DNS.SB, Brahma World, LibreDNS, RethinkDNS, IIJ in Japan, and AliDNS, DNSPod and 360 in China. If the domain uses DNSSEC, run the DNSSEC Checker after a name server change, since a mismatched DS record stops it resolving.

Choose A, AAAA, CNAME, MX, NS, TXT, CAA or SOA. Each resolver's answer is listed with its response time, a country flag and any CNAME it followed. Type the new IP or text into Expected value and the resolvers that already return it get a tick, while the others are flagged. Resolvers keep an old answer until its TTL runs out, so lower the TTL well before a planned move. These are public resolvers from different countries, not probes in every city, and your internet provider's own resolver may lag behind them. For one full answer with TTLs, use DNS Lookup.

How to use DNS Propagation Checker

  1. 1
    Enter the domain

    Type the domain or host name you changed, such as www.example.com.

  2. 2
    Pick the record type

    Choose A, AAAA, CNAME, MX, NS, TXT, CAA or SOA.

  3. 3
    Add the expected value

    Optionally type the new IP or text, so resolvers that already return it are marked.

  4. 4
    Check propagation

    Click Check propagation, and run it again later to watch the change spread.

Why use Cubfile for this

  • 14 resolvers at once

    Global services plus AliDNS, DNSPod and 360 in China, all asked in parallel.

  • Expected-value matching

    Enter the new value and see at a glance which resolvers already have it.

  • Answer, time and country

    Every resolver's reply comes with its response time and a country flag.

  • Eight record types

    A, AAAA, CNAME, MX, NS, TXT, CAA and SOA, for site moves and email changes alike.

FAQ

DNS Propagation Checker: questions and answers

How long does DNS propagation take?
Usually minutes to a few hours, depending on the old record's TTL. A change of name servers can take a day or two, because the registry's records are cached too. The WHOIS Lookup shows which name servers the registry lists for the domain right now.
Why do some resolvers still show the old IP?
They cached the old answer and keep it until its TTL expires. Google and Cloudflare have public pages for flushing a name from their cache, and for the rest, waiting is the fix.
Does this test DNS from every country?
No. It asks 14 public resolvers from different countries, not probes in every city. It shows whether the big public resolvers already have your change.
What should I type as the expected value?
The value you just set, such as an IP address for A or AAAA, a host name for CNAME, MX or NS, or part of the text for TXT. Resolvers that return it get a tick.
Is the DNS propagation checker free?
Yes, with no account needed and no daily tasks used. An hourly allowance per visitor prevents abuse, and it's higher for members and VIP.
Share DNS Propagation Checker with a friendIt runs in any browser, and they can try it without signing up.

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