Final answer:
Certain services like Hack The Box and VulnHub, as well as preapproved ranges in AWS Marketplace, do not require pre-approval for penetration testing. They are designed for safe and legal security practice. Always read terms and conditions to ensure compliance.
Step-by-step explanation:
Services that generally do not require pre-approval for penetration testing are those provided by platforms specifically designed for security training and research, such as Hack The Box, VulnHub, and certain ranges provided by cloud providers like AWS (Amazon Web Services) in their AWS Marketplace for security practice. These services offer environments that are legal and safe for individuals to conduct security testing and improve their penetration testing skills. It is still critically important to read and understand the terms and conditions of any service to ensure compliance with their policies as not every environment, even on these platforms, may allow for testing without permission. For more substantial or real-world environments not designed for this purpose, explicit permission from the system owner is always required to avoid legal repercussions and to conduct ethical testing.