The names we hold back, in full.

When you ask for a label or a friendly-name, the registration path classifies it against three lists. This page renders those very lists at the moment you load it. We do not maintain a separate published copy, so the page can never quietly disagree with what is blocked. If a name appears below, asking for it is refused with a clear reason; if it does not, it is free to take. Read the rules these lists serve on the naming policy.

These 199 labels are reserved so a friendly-name cannot impersonate the infrastructure or mislead a reader: the RFC 2142 role mailbox names (hostmaster, postmaster, abuse, security, and the rest), common infrastructure hostnames, and our own Whisper service names (ns1 through ns99, doh, rdap, whois, nic, and so on). Asking for one is refused with a clear "reserved name" reason. We author this list ourselves, so it carries no external licence.

Matched whole-label and case-insensitively. A label that merely contains one of these as a substring is not blocked; the match is on the whole label, so it is Scunthorpe-safe.

These 181 labels are a hand-picked set of high-value generic terms (such as bank, login, wallet) and well-known brand names, held as premium to prevent squatting and impersonation. Ordinary common words are not on this list and stay freely registrable; only this curated subset is held. Asking for one is refused with a distinct "premium name, contact us" reason, and it is held for a future acquisition process. We author this curated list ourselves; it carries no external licence.

Want one of these for a genuine, stated use? Write to registry@whisper.security. Like the reserved set, premium names match whole-label and case-insensitively.

Names matching our offensive-content blocklist are rejected with a clear reason. The list is the English "List of Dirty, Naughty, Obscene, and Otherwise Bad Words" (LDNOOBW), used and republished under its Creative Commons Attribution 4.0 licence. We do not print the slurs inline here; out of plain decency the list is offered as a labelled download for anyone who needs to audit exactly what is blocked.

• 279 single-label tokens are enforced (multi-word phrases in the upstream file cannot match a single DNS label, so they are kept for reference but never block a label).
• Source: LDNOOBW, the English list. github.com/LDNOOBW.
• Licence: CC BY 4.0, with attribution as given here and on the data licence page.

The download is the exact file the registration path enforces, served verbatim, so an auditor reads precisely what is blocked.

We keep a comprehensive English word list as the registry's vocabulary reference and as the basis for curating the premium set, but it is not enforced and it is not republished here: ordinary common words are yours to register. The reference is dwyl/english-words (words_alpha.txt), in the public domain under the Unlicense.

• Reference: dwyl/english-words. github.com/dwyl/english-words.
• Licence: The Unlicense (public-domain dedication).
• It is a reference only. The full word list is not blocked and not served here; see the upstream link for it.