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If you are having problems with your web site not coming up or your email is not working.
Try doing some of these tests below.
A more advance place to go is:
DNSstuff.com
http://www.DNSstuff.com
Here you can do more advance Testing.
Domain Tests (e.g. example.com)
DNS Timing (See how long your DNS servers take to respond)
WHOIS Lookup (Lists contact info for a domain/IP (about 150 TLDs!).
Abuse Lookup (Finds abuse contact for a domain from abuse.net).
WHOIS Search (True WHOIS search, using www.whois.sc.)
IP Tests (e.g. 192.168.100.1)
Spam database lookup (See if a mail server is listed in 150+ spam databases)
Reverse DNS lookup (See if your IP has a reverse DNS entry)
IPWHOIS Lookup (Lists contact info for an IP (or domain))
NetGeo IP Lookup (Shows geographical location of an IP (or domain))
IP Routing Lookup (Shows IP routing info, from RADB.)
Hostname Testing ( e.g., example.com )
DNS lookup (Look up a DNS record (A, MX, NS, SOA, etc.))
Tracert (Traces the route packets take to this host.)
Ping (Shows how long it takes for packets to reach a host.)
ISP cached DNS lookup (Check cached DNS at major ISPs.)
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