HEATKEYS

UltraTools is a complete set of free DNS and domain tools, which test the health of your domain name servers, websites and online hosting environment.

DNSstuff offers DNS tools, Network tools, Email tools, DNS reporting and IP information gathering. Explore monitoring products and free DNS tools at DNSstuff.

DNSQueries provides network tools and lets you make every needed network test, such as domain health tests, RBL checks, dns lookup, ptr queries, host geographical informations, dns query and many more

DNS, Network & IP Tools. Free online tools; DNSReport, nsLookup, IP Location, Traceroute, Whois, Ping, rDNS, Email test & more

DNSQuery.org is a free, non-profit web site, targeting system or dns or domain administrators, to enable them make some queries via a candy web interface

Site24x7 offers both free & paid website monitoring services. Monitor websites remotely and receive instant email/sms alerts if your website becomes unavailable. View uptime & performance graphs of your website monitors.

Online DNS tools. DNS lookup, reverse DNS lookup. Domain configuration check. IP address calculators.

Free DNS service what you

This website is full of network & text related tools, some reference material, plus lots of interesting tech how-to

What

Research domain ownership with Whois Lookup: Get ownership info, IP address history, rank, traffic, SEO & more. Find available domains & domains for sale.