An IP address can be blocked for several reasons and on several occasions. The government can block an IP address or a range of IP addresses because some website(s) contains content that is illegal in a particular country. A mail company, such as Hotmail or Outlook, can set up a new anti-spam policy. It could also be that a website decided to block an IP address to avoid DDoS attack. Blocking them is known as blacklisting, and are mostly common with respect to spam and malware.
"In computing, a blacklist or block list is a basic access control mechanism that allows through all elements (email addresses, users, URLs, etc.), except those explicitly mentioned. Those items on the list are denied access. The opposite is a whitelist, which means only items on the list are let through whatever gate is being used. A greylist contains items that are temporarily blocked (or temporarily allowed) until an additional step is performed." - source, Wikipedia.
An IP address can be blocked for several reasons and on several occasions. The government can block an IP address or a range of IP addresses because some website(s) contains content that is illegal in a particular country. A mail company, such as Hotmail or Outlook, can set up a new anti-spam policy. It could also be that a website decided to block an IP address to avoid DDoS attack. Blocking them is known as blacklisting, and are mostly common with respect to spam and malware."In computing, a blacklist or block list is a basic access control mechanism that allows through all elements (email addresses, users, URLs, etc.), except those explicitly mentioned. Those items on the list are denied access. The opposite is a whitelist, which means only items on the list are let through whatever gate is being used. A greylist contains items that are temporarily blocked (or temporarily allowed) until an additional step is performed." - source, Wikipedia.
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