#21c3

Live, measured metrics for the hashtag #21c3 from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.

hashtag.org network · sponsored

Own #21c3

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.

$2,449.80/ year · 4-character #name
Claim #21c3 — $2,449.80/yr→
Annual, renews each year
Buy on hashtag.space (web3)
one-timepay once, yours for life
card via hashtag.org · tokens via hashtag.space
0
Uses / 7 days
Mastodon
0
Accounts / 7 days
Mastodon
19
Recent posts
Mastodon
~0/hr
Recent pace
Mastodon · last 19
0
Avg reactions / post
Mastodon · last 19

Day-by-day usage

measured · fosstodon.org (Mastodon public tags API) · fetched 2026-07-27 08:12 UTC
0
07-21
0
07-22
0
07-23
0
07-24
0
07-25
0
07-26
0
07-27

0 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 2026-07-27 08:12 UTC
#guid3ec21c900339
0 uses · 0 accounts / 7d
#f3e21f41c60
0 uses · 0 accounts / 7d
#ff8006f3c21
0 uses · 0 accounts / 7d
#fc21fb8e3c7
0 uses · 0 accounts / 7d
#ac21c3
0 uses · 0 accounts / 7d
#3c4b21
0 uses · 0 accounts / 7d
#rC3_21
0 uses · 0 accounts / 7d
#3c21cc
0 uses · 0 accounts / 7d
#c21ce3
0 uses · 0 accounts / 7d
#DE21C3
0 uses · 0 accounts / 7d
#3A0C21
0 uses · 0 accounts / 7d
#C3AC21
0 uses · 0 accounts / 7d

Live pulse

measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-07-27 08:12 UTC

Everything below is measured over the latest 19 public posts (spanning ~62995 hours).

Posting hours (UTC) — busiest: 13:00

00:0012:0023:00

Languages: English (13) · German (5) · Croatian (1)

Avg boosts / post: 0

Top of the latest posts

  • Vor Jahren Schlittschuhe gekauft, um beim #21c3 auf der Eisbahn auf dem Alex Pause zu machen. Heute hat sich der Absatz vom Schuh gelöst. Kriegt man sowas sinnvoll repariert, und wenn ja wie - oder ist das ein Fall für 'bitte neu'?

    MaineC@[email protected]♥ 0↻ 02026-02-15 13:36 UTCView post →

  • Zur Abwechslung der CCC Jahresrückblick vom #21c3 https://media.ccc.de/v/055_CCC-Jahresrueckblick 📺📺

    heiko linke@[email protected]♥ 0↻ 02024-09-11 10:28 UTCView post →

  • Stellt sich raus dass bei einer Reihe meiner alten Congress-Vortraege der Name fehlt und die Vorträge damit vielleicht nicht so gut gefunden werden. Update angefragt @c3voc https://media.ccc.de/v/099_GPL_fuer_Anfaenger https://media.ccc.de/

    hubertf@[email protected]♥ 0↻ 02024-06-07 13:21 UTCView post →

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/21c3