nslookup missing
Have to install it.
user @iowa_f1:~$ sudo apt-get install dnsutils -y Reading package lists... Done Building dependency tree Reading state information... Done dnsutils is already the newest version (1:9.11.5.P4+dfsg-5.1+deb10u3). 0 upgraded, 0 newly installed, 0 to remove and 6 not upgraded.
This will install nslookup and dig.
Dig is a dns inquire program, that is a bit more complex to nslookup.