If a list of allowed websites is not implemented, a list of blocked websites is implemented instead.
Topic
Blocking access to specific websites
Applicable to
all
History
Priority
recommended
Mar 2022
Removed
The recommendation to implement a list of blocked websites only if a list of allowed websites wasn’t implemented was merged into recommendations to block dynamic domain names and domain names that can be registered anonymously for free, thereby reflecting that even if a list of approved website categories is implemented that tailored blocking of specific known malicious domain names can still be beneficial.
2015
If agencies do not whitelist websites they should blacklist websites to prevent access toknown malicious websites.
2010
It is recommended that if agencies do not whitelist websites they blacklist websites to prevent access toknown malicious websites.