#hfunderground

Live, measured metrics for the hashtag #hfunderground 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 #hfunderground

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.

$5.00/ year · 13-character #name
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card via hashtag.org · tokens via hashtag.space
0
Uses / 7 days
Mastodon
0
Accounts / 7 days
Mastodon
13
Recent posts
Mastodon
~0/hr
Recent pace
Mastodon · last 13
0.4
Avg reactions / post
Mastodon · last 13

Day-by-day usage

measured · fosstodon.org (Mastodon public tags API) · fetched 2026-07-28 00:26 UTC
0
07-22
0
07-23
0
07-24
0
07-25
0
07-26
0
07-27
0
07-28

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 2026-07-28 00:26 UTC

No related tags with measured usage found for #hfunderground.

Live pulse

measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-07-28 00:26 UTC

Everything below is measured over the latest 13 public posts (spanning ~17376 hours).

Posting hours (UTC) — busiest: 02:00

00:0012:0023:00

Languages: English (13)

Avg boosts / post: 0.5

Top of the latest posts

  • Ringway Manchester on Youtube has details of a brand new number station, possibly from #Iran, or possibly #CIA or #Mossad number station broadcasting in #Farsi for Iranian assets? https://www.youtube.com/watch?v=ErmbTpxAM7Q #Shortwave #HF #

    Chris Smart@[email protected]♥ 2↻ 12026-03-03 03:00 UTCView post →

  • Today's #USAF High Frequency Global Communications System traffic all seems to be coming from callsign "Sky Chief", and the messages begin with the strange phrase "four quarto". 11175 kHz USB #HF #HamRadio #AmateurRadio #ShortWave #SWL #HFU

    Chris Smart@[email protected]♥ 2↻ 12026-01-30 14:44 UTCView post →

  • Pirate radio V-Sky Radio from "The Voice of the Sky" on 6975 USB - station ID at 0104Z. ID also at HF Underground, and generally people there publish a set list https://www.hfunderground.com/board/index.php/topic,139856.0.html signal good i

    Ed W8EMV :radio_tower:@[email protected]♥ 1↻ 12025-01-18 01:10 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/hfunderground