Best tool for checking up domains, ip numbers, mail headers, MX, TXT records etc etc.
Check your own IP, handy to check if your VPN is working.
Check-Host is a modern online tool for website monitoring and checking availability of hosts, DNS records, IP addresses. It supports the latest technologies such as localized domain names (both punycode and original formats), hostname IPv6 records (also known as AAAA record).
We have developed a Linux based script (require a Ubuntu installation) using this service to batch lookup a list of IP's. Read more about the script here.
Collection of historical DNS information. Free, simple and easy to use.
The World's Largest Repository of historical DNS data. Free, simple and easy to use.
Simple & fast programmatic IP address lookup for your website & mobile app
An alternative to MX Toolbox.
Check what's linking to a specific URL.
Robtex is used for various kinds of research of IP numbers, Domain names, etc
IRC search tool
Internet of things search engine. Can find heaps of misconfigured network connected devices.
Takes the information from public sources, then structure it for your quick and convenient search for the websites that probably belong to the same owner. Great for retrieve websites and their Tracking codes.
An alternative to MX Toolbox.
Find out what email addresses are connected to a domain