#PageNotFoundError404
Live, measured metrics for the hashtag #PageNotFoundError404 from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.
Own #pagenotfounderror404
This #name is available to claim. It becomes your portal on the open agent web: this very page, a keyword you rank for by an open public stake, and a verifiable identity for AI agents. Nobody else sells a page like this for every #name.
Day-by-day usage
measured · fosstodon.org (Mastodon public tags API) · fetched 2026-08-02 16:42 UTC0 uses by 0 unique accounts across the window. Real per-day counts, not estimates. Newest bar is today so far.
Related hashtags
measured · fosstodon.org (Mastodon public search API) · fetched 2026-08-02 16:42 UTCNo related tags with measured usage found for #pagenotfounderror404.
Live pulse
measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-08-02 16:42 UTCEverything below is measured over the latest 1 public posts.
Posting hours (UTC)
Languages: English (1)
Avg boosts / post: 1
Top of the latest posts
A New Best Practice for User Friendly 404 Page Design? I clicked a link from a 2-year-old Hacker News thread, and Nielsen Norman Group served up a 404 page. On that 404 page, NN/G served up an educational message for visitors who arrive fro
#pagenotfounderror404 across platforms
every network with a public tag surfaceFollow #pagenotfounderror404 straight to each platform’s own tag page. Where a platform publishes open data we measure it above; the rest lock their numbers behind paid APIs, so we link rather than guess.
Every number above is measured from a named public API at the shown fetch time. Nothing is estimated or extrapolated. Platforms that lock their data behind paid APIs are not shown. Agents: the same numbers, as JSON, at /api/hashtags/pagenotfounderror404