Internet DNS related

DNS Propagation Checker
whatsmydns.net lets you instantly perform a DNS lookup to check a domain names current IP address and DNS record information against multiple name servers located in different parts of the world.
This allows you to check the current state of DNS propagation after having made changes to your domains records.
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Types of Domain Redirects - 301, 302 URL Redirects, URL Frame (and CNAME)
URL Redirect 301 is ... considered to be the most efficient and search engine-friendly method for webpage redirection.
302 redirect is a temporary type of unmasked redirect. ... Search engines will index the original URL and not the destination URL and display the original URL in search results.
URL Frame is bad for SEO
CNAME record is actually not a redirect type record but often mistakenly used as such. The main difference between CNAME and other redirects is that CNAME is just a DNS record type (similar to A, TXT and other DNS level records) while 301, 302 redirects and URL frames are hosting server-powered redirects. In other words, CNAME is not redirecting anything but only provides the same IP addresses and other DNS records from the domain you create CNAME to.
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Probably problem on DNS server you currently use

If you decide to switch to another DNS server which does NOT belong to your current connection (ISP) AND it blocks query from another source but its own network, add static route pointing to that DNS server via appropriate connection
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Cari Server DNS Tercepat ? Ini Caranya