Below are a series of example queries:

Hosts in 23.0.0.0/8 and 8.8.8.0/24:

IPv4

Telnet and FTP hosts in Germany:

IPv4

Popular websites without browser trusted certificates:

Websites

Popular websites that use Apache and support HTTPS:

Websites

Mozilla NSS trusted intermediate CAs:

Certificates

Industrial Control Systems in the United States:

IPv4

Hosts in ASes that contain word University:

IPv4

1000–1010th most popular site per Alexa Top Million:

Websites

Trusted certificates for Github.com:

Certificates