And not just printers. There may or may not also be a few Wi-Fi APs with login details admin:admin. And there also may or may not be many computers with RDP enabled without password. And those that have some password may or may not re-use the same short password for Administrator account. There also may or may not be SMTP server, though unfortunately in my case it doesn’t allow using it so send e-mails outside the network. It returns “Relay access denied” error.