These network utilities are provided by CloudfloorDNS, providers of high quality dns and domain management services.

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Ping Utility
Domain Name or IP
Number of Ping Packets to Send
 
DNS Lookup Utility (including zone transfer)

Host address

Server to query
Test if common ports are open (SMTP, POP3, HTTP(s), DNS)
Host to check
 
WHOIS lookup
Domain name www.
Get web server headers
Host name
Follow redirect
 
Global DNS Propagation check - Checks public dns servers to see if your dns change has propagated (A records only)
Host name
IP Geolocation
IP to check
 
Open relay test
Mail server name or ip
 

 

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Some other useful utilities

SPF record generator