Check if a domain is available or not. Nearly as accurate as whois, and you won't get an error if you make too many calls.

Uses DNS Made Easy as the domain source list to ns lookup name servers and verify.

A basic DNS resolver using Celluloid

DNSTraverse is a rubygem and command line program that allows you to traverse the DNS from the root exploring all possible ways of getting to the final destination domain name. The results are probabilities of which server will respond and what they will respond with.

Speaks nsupdate's protocol, queries jsonip.com

This Gem give you the power to monitor the Docker event stream via it's API and send dynamic updates to a DNS server on certain events

Direct Payment Standard (DPS) specifies a common way for entities to advertise payment options as well as facilitate payments directly between 2 parties. This library contains tools to interact with or implement a DPS server.

Try and authenticate email address, check format, lookup mx record and check smtp connectivity

metasploit-framework

Mock DNS Server

MX validator is gem for verifying email addresses via MX records.

Nines is a simple server monitoring tool written in Ruby.

This

This

Provides

Easily test your DNS entries with RSpec

This the API client to the Storehouse application.

A set of tools to assist developer.

A simple interface for the CYMRU DNS-based virus blacklist.

Wamupd -- A Ruby program to update DNS-SD using Avahi & D-Bus