Top 20 NuGet blacklist Packages

A middleware that allows whitelist or blacklist incomming requests based on IP address. It can be configured using single IP address or ranges. It supports single IP, IP range IPv4 and IPv6. There is also possible to ignore specific paths from IP filtering.
Unofficial API for whatismyipaddress.com
A small module meant for use in text generators that lets you filter strings for bad words. .net port of https://github.com/dariusk/wordfilter
Blacklist binding library for Bridge.NET projects.
IsBizMail tells you whether a given email address is free (gmail.com, yahoo.es, yandex.ru etc) or not