#MC21

Live, measured metrics for the hashtag #MC21 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 #mc21

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 #mc21 — $2,449.80/yr→Buy on hashtag.space (web3)
card via hashtag.org · tokens via hashtag.space
0
Uses / 7 days
Mastodon
0
Accounts / 7 days
Mastodon
7
Recent posts
Mastodon
~0/hr
Recent pace
Mastodon · last 7
0
Avg reactions / post
Mastodon · last 7
—
Reddit posts / month
Reddit search
—
Open-web mentions
hashtag.org Firehose

Day-by-day usage

measured · mastodon.online (Mastodon public tags API) · fetched 2026-10-16 02:16 UTC
0
10-10
0
10-11
0
10-12
0
10-13
0
10-14
0
10-15
0
10-16

0 uses by 0 unique accounts across the window. Real per-day counts, not estimates. Newest bar is today so far.

Related hashtags

measured · mastodon.online (Mastodon public search API) · fetched 2026-10-16 02:16 UTC
#nsr250mc21
0 uses · 0 accounts / 7d
#McQueenMenSS21
0 uses · 0 accounts / 7d
#mc21airliner
0 uses · 0 accounts / 7d
#MC_21
0 uses · 0 accounts / 7d

Live pulse

measured · mastodon.online (Mastodon tag timeline) · fetched 2026-10-16 02:16 UTC

Everything below is measured over the latest 7 public posts (spanning ~8584 hours).

Posting hours (UTC)

00:0012:0023:00

Languages: English (6)

Avg boosts / post: 0.1

Top of the latest posts

  • Second import-substituted #MC21 takes flight! Oct 28: 1hr maiden flight from Irkutsk @ 500km/h, 3,500m. All-Russian: PD-14 engines, composite wing, avionics 2nd prototype joins 1st for cert testing. Deliveries soon! #Rostec #UAC https://def

    defensedaily@defensedaily@mstdn.social♥ 0↻ 02025-10-30 03:51 UTCView post →

  • Second Russian MC-21 Import-substituted Aircraft Takes to Flight https://defensemirror.com/news/40439/Second_Russian_MC_21_Import_substituted_Aircraft_Takes_to_Flight #MC21 #RussiaAviation #PD14 #UAC #Rostec #AircraftTesting #Irkutsk #Aeros

    Worlddefensereport@Worlddefensereport@mstdn.social♥ 0↻ 02025-10-30 03:51 UTCView post →

  • Le prototype MC‑21 entièrement “russifié” (73057) approche de sa station de test vol à Irkutsk : certification en vue d’ici 2026. https://f-aero.fr/le-prototype-mc-21-substitue-sapproche-du-transfert-a-la-station-de-test-de-vol/ #AerospaceE

    AlcorNews@AlcorNews@mastodon.social♥ 0↻ 02025-08-03 10:20 UTCView post →

What “mc21” means

Wiktionary · Wikipedia

mc

  • nounThe unit of radioactivity equal to one thousandth of a curie: symbol mCi.
Full entry on Wiktionary →

A master of ceremonies is in charge of ceremonies, staged events, conferences, conventions, or performances such as parties. They are responsible for introducing speakers and or performers as well as making announcements.

“Master of ceremonies” on Wikipedia (CC BY-SA) →

#mc21 across platforms

every network with a public tag surface

Follow #mc21 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.

X (Twitter) ↗Instagram ↗TikTok ↗Facebook ↗LinkedIn ↗YouTube ↗Threads ↗Bluesky ↗Mastodon ↗Reddit ↗Pinterest ↗Tumblr ↗

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/mc21