Manually Clearing Cached DNS Records The following three websites will help you clear out previously cached DNS records to speed up the worldwide. Simply visit each site and run the cache clear:

1. OpenDNS: https://cachecheck.opendns.com/
2. Cloudflare: https://1.1.1.1/purge-cache/
3. Google: https://developers.google.com/speed/public-dns/cache

source: https://gridpane.com/kb/speeding-up-dns-propagation-manually-clearing-out-cached-records/