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Due to threats from botnets, internet security is becoming less safe. An attack plan can only be planned out to take down the botnet after the monitoring activities to understand the behavior of a botnet. Nowadays, the architecture of the botnet is developed using a Peer-to-Peer (P2P) connection, causing it to be harder to be monitored and tracked down. This paper is mainly about existing botnet monitoring tools. The aim of this manuscript is to investigate the ways to monitor a botnet and how the monitoring mechanism works. The monitoring tools are categorized into active and passive mechanisms. A crawler is an active mechanism, while sensor and Honeypot are the passive mechanisms. Previous work about each mechanism is present in this paper as well.