Hostnames and usernames to reserve
List of all the names that should be restricted from registration in automated systems.
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- 2026-10-10
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General List of Reserved Words gist.github.com
This is a general list of words you may want to consider reserving, in a system where users can pick any name.
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The Public Suffix List github.com
🆓 Mozilla's registry of public suffixes, under which Internet users can (or historically could) directly register names.
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Statistically Likely Usernames github.com
🆓 Wordlists for creating statistically likely usernames for use in username-enumeration, simulated password-attacks and other security testing tasks.
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common-domain-prefix-suffix-list.tsv gist.github.com
Top-5000 most common domain prefix/suffix list.
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Identity Beyond Usernames lord.io
On the concept of usernames as identifiers, and the complexities introduced when unicode characters meets uniqueness requirements.
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IAM › Blocklists > Reserved IDs: “List of all the names that should be restricted from registration in automated systems.”