Install adns-tools by entering the following commands in the terminal:
sudo apt update sudo apt install adns-tools
Description:
Asynchronous-capable DNS client utilities
adns is a DNS resolver. In contrast with many existing interfaces, gethostbyname et al and libresolv, it can be used in an asynchronous, non-blocking manner. Many queries can be handled simultaneously. . This package contains useful utilities for IP address resolving, fast bulk logfile processing, and testing.
Homepage: http://www.chiark.greenend.org.uk/~ian/adns/
Version: 1.5.0~rc1-1.1ubuntu1
Section: universe/net