DNS Propagation Checker
Just changed a DNS record or moved hosting? See whether public resolvers in several countries already use the new value, compared directly with what your domain's nameserver answers.
14 of 17 resolvers give the same answer. 3 resolvers still give a different answer, usually an old cached one. The TTL column shows how long their cache has left. 1 resolvers did not answer.
Each resolver is asked over DNS-over-HTTPS from the ipku.in server, and the domain's nameserver is asked directly. Anycast resolvers answer from the site nearest our server.
| resolver | answer | ttl | time |
|---|---|---|---|
✓ Cloudflareanycast | 104.21.2.152172.67.129.86 | 300s | 23 ms |
✓ Googleanycast | 104.21.2.152172.67.129.86 | 300s | 16 ms |
✓ OpenDNS (Cisco)anycast | 104.21.2.152172.67.129.86 | 187s | 310 ms |
✓ NextDNSanycast | 104.21.2.152172.67.129.86 | 214s | 1542 ms |
✓ AdGuard DNSanycast | 104.21.2.152172.67.129.86 | 300s | 1539 ms |
✓ Control DCanada | 104.21.2.152172.67.129.86 | 300s | 1230 ms |
✓ Wikimedia DNSUnited States | 104.21.2.152172.67.129.86 | 300s | 1229 ms |
× DNS.SBGermany | HTTP 503 | 1027 ms | |
≠ dnsforge.deGermany | 188.114.96.3188.114.97.3 | 300s | 1591 ms |
≠ Freifunk MünchenGermany | 188.114.96.3188.114.97.3 | 300s | 1405 ms |
≠ LibreDNSGreece | 188.114.96.2188.114.97.2 | 300s | 1798 ms |
✓ Comss.oneRussia | 104.21.2.152172.67.129.86 | 8600s | 2384 ms |
✓ AliDNSChina | 104.21.2.152172.67.129.86 | 300s | 1741 ms |
✓ DNSPod (Tencent)China | 104.21.2.152172.67.129.86 | 300s | 1729 ms |
✓ 360 Secure DNSChina | 104.21.2.152172.67.129.86 | 600s | 2146 ms |
✓ IIJ Public DNSJapan | 104.21.2.152172.67.129.86 | 300s | 2018 ms |
✓ BebasIDIndonesia | 104.21.2.152172.67.129.86 | 300s | 1729 ms |
✓ TiarapIndonesia | 104.21.2.152172.67.129.86 | 300s | 1246 ms |
DNS propagation, briefly.
What is DNS propagation?
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After a DNS record changes, resolvers around the world keep the old answer cached until its TTL runs out. Propagation is the time until every resolver uses the new value. The change itself is live on your nameserver right away; what you wait for is caches expiring.
How long does DNS propagation take?
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At most the TTL of the old record, usually 5 minutes to a day. A nameserver change at the registrar can take up to 48 hours, since NS records at TLD servers like .com usually have a TTL of 1 to 2 days. Lower the TTL a few hours before a move to make the switch faster.
Why do some resolvers give a different answer?
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Most often an old cached answer that has not expired yet. It can also be GeoDNS or load balancing (a CDN, say), which hands out different IPs per location on purpose, or a resolver that filters certain domains.
Can I use it from a terminal?
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Yes. curl 'ipku.in/en/tools/dns-propagation?q=example.com&type=MX' returns every resolver's answer as plain text, and /api/propagation/example.com?type=MX returns JSON.