Ipazilla.com -

For sysadmins, one of the most valuable tools is an RBL (Real-time Blackhole List) check. Ipazilla.com allows you to enter any IP address to see if it has been flagged for spam or malicious activity on major blacklists like Spamhaus or Barracuda.

: Modified versions of standard apps with extra features (e.g., ad-free social media clients). Ipazilla.com

In 2006, the site vanished from search engines. Not by accident — someone had manually submitted a robots.txt disallow for every crawler except the Internet Archive’s. Why? To become a shadow library, visible only to those who already knew the address. For sysadmins, one of the most valuable tools

: Standard social media or productivity apps modified to include premium features for free. In 2006, the site vanished from search engines

While some users held out hope, the community on forums like