dnstwister

require "dnstwister"

api = DNSTwister::API.new

domain = "example.com"

res = api.fuzz(domain)
fuzzy_domains = res.dig("fuzzy_domains") || []
p fuzzy_domains.map { |domain| domain.dig "domain" }
# => ["example.com", "examplea.com", "exampleb.com", "examplec.com", "exampled.com", ...]

api.safebrowsing domain
api.ip domain
api.parked domain
api.whois domain