Pwned Passwords are half a billion real world passwords previously exposed in data breaches. This exposure makes them unsuitable for ongoing use as they’re at much greater risk of being used to take over other accounts. They’re searchable online below as well as being downloadable for use in other online system.
The IANA WHOIS Service is provided using the WHOIS protocol on port 43. This web gateway will query this server and return the results. Accepted query arguments are domain names, IP addresses and AS numbers. ♥
InboxBear is a service that gives you up to 10 in-boxes that you can use when registering to un-trusted web sites. Instead of giving these web sites your real email address, you give them one our bear supplies. This way Mr bear has lots of spam to eat and your real inbox is protected.
IP bulk lookup tool allows to lookup domain, location, ISP and ASN for multiple hosts (IPs or domains) at once. It also supports lookup of MX or NS DNS records for multiple domains. This tool is commonly used for investigating IPs found in server logs. The limit is 100 IPs/domains per request.
Bulk IP lookup (batch IP checker) is a tool to get location of multiple IP addresses in one click. Type or paste all the IP addresses in the first box, one per line and without any comma or separator. Enter your API key, select output format (HTML, JSON, CSV, XML, YAML) & press submit.
Enter an URL and this site will count up how many times it was ever shared across the 4 major social sharing sites: Facebook, Twitter, Google Plus and LinkedIn.
The Lumen database collects and analyses legal complaints and requests for removal of online materials, helping Internet users to know their rights and understand the law.
Nibbler is a tool for testing websites. Enter the address of any website and Nibbler will give you a report scoring the website out of 10 for key areas, including accessibility, SEO, social media and technology.
“Pastebin is a popular website for storing and sharing text. Though it’s mostly used for distributing legitimate data, it seems to be frequently used as a public repository of stolen information, such as network configuration details and authentication records.” SOURCE:https://zeltser.com/
“This site is responsible for the safekeeping of historical reverse DNS records. It has over 43 billion records retrieved from 2008 to the present.” Source: PTRarchive.com
This site can be used to view the technical details about internet, offer diagnostic tools and show information to track spammers, hackers or other suspicious activities.
Check if the website has a sitemap. A sitemap is important as it lists all the web pages of the site and let search engine crawlers to crawl the website more intelligently.
Here you can propose new malware urls or just browse the URLhaus database. If you are looking for a parsable list of the dataset, you might want to check outthe URLhaus API.
OnionScan is a free and open source tool for investigating the Dark Web. 
Source: Twitter post from @PaulWebSec
