Split an IPv4 CIDR block into subnets by new prefix or subnet count - network, broadcast, first and last host and usable hosts for each subnet

Aurora visibility probability for any lat/lon from the NOAA OVATION model - percent chance, strongest nearby value and equatorward edge latitude

US federal contract and grant award search by keyword - recipient, agency, amount, dates and description from USAspending.gov, newest two fiscal years

JPL Horizons sky position of the Sun, Moon, planets, Ceres or Vesta - right ascension, declination, apparent magnitude, distance in AU, range rate and elongation

Current NSW Rural Fire Service major incidents - alert level, status, type, council area, size in hectares, agency, location and totals by level

US Drought Monitor percent of area in each drought category D0-D4 for the US, any state or county FIPS, with weekly history and weekly change

Search DataCite DOIs for datasets, software and other research outputs - title, creators, publisher, year, resource type, licence, citations and views

FDA drug label search from DailyMed - structured product label set ids, labeler, version and publish date with direct label and XML links for any drug

Singapore two-hour weather nowcast for 47 areas from NEA - forecast per area with coordinates, an island summary and the areas expecting rain

Trending hashtags and news links on mastodon.social - accounts and uses over the last two days plus a seven-day history per tag, or shares per link

Bluesky profile lookup by handle - follower, following and post counts, bio, DID, account creation date, verification and labels from the public AT Protocol

Lemmy posts from major instances by Hot, Active, New or Top sort and optional community - title, score, comments, community, author, link and thread URL

Scholarly article search from Crossref - DOI, title, authors, year, journal, publisher and citation count for any paper title or topic query

Current space weather from NOAA SWPC - Kp index and G-scale, solar flare X-ray class now and 6-hour max, forecast Kp peak and recent alerts

Monthly sunspot number, smoothed sunspot number and F10.7 radio flux history with the Solar Cycle 25 peak so far, from NOAA SWPC

Recent research-grade wildlife sightings from iNaturalist by species and optional lat/lon radius - date, place, coordinates, observer and photo

Species and taxon search from iNaturalist - scientific and common names, rank, group, observation count, photo and Wikipedia link for any organism

Species taxonomy lookup from GBIF - scientific name match, full classification kingdom to genus, English common names and global occurrence record count

Search the Catalogue of Life for accepted taxa - scientific name, authorship, rank, status, kingdom to genus classification and a link for each match

Asteroid and comet data from NASA JPL - orbital elements, orbit class, near-Earth and hazardous flags, Earth MOID, absolute magnitude, diameter and rotation