As we know cloudflare (1.1.1.1) and google (8.8.8.8) public dns is mostly used public dns, sometime after change dns configuration this public dns cache our dns record, here are two website owned by cloudflare and google to help purge that dns cache:
Cloudflare
https://cloudflare-dns.com/purge-cache/
Google
https://developers.google.com/speed/public-dns/cache
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