The archive

Servers that were measured and are now gone — deleted, revoked, or collapsed. The record no directory keeps.

Mortality

Deaths per week

Age at death and 7-day death rate by topic

Only topics with at least 30 recorded deaths (age columns) are listed. The death-rate column additionally requires at least 500 servers of that topic already in the corpus at the start of the 7-day window.

Deaths are only observable for servers we had already measured. 52% of these deaths (11,919 of 22,949) are strong evidence — a vanity URL went dead, which does not happen while a server is alive. The other 48% are servers whose temporary invites all expired without ever resolving again; those servers MAY still be alive but unlisted, since an expired temporary invite alone does not prove deletion. The corpus is only 97 days old, so "days measured before death" (median 29.0d) is truncated — it cannot exceed the corpus's own age, and will keep rising as older servers accumulate more measured history.