Realurls

Natural Language Toolkit

Also known as nltk. Wikidata Q1635410. GitHub nltk.

Official domains: nltk.org

Identity anchored by wikidata:Q1635410/P856 wikidata:Q1635410/P2037. Display name from wikidata:Q1635410.

nltk.org verified primary · confidence 0.71 · verified 2026-09-05

1 independent anchor(s) + 3 independent corroboration(s): meets the verified threshold

EvidenceWhat it shows
A1 not counted GitHub verified this organization's domain (DNS-level check performed by GitHub)
org=nltk org_verified=false blog=http://nltk.org
 source
A8 anchor Anchored repository's homepage points here, and this site links back
repo=nltk/nltk org=nltk repo_anchored=true homepage=https://www.nltk.org backlink=true stars=14706 age_days=6207 contributors=519
 source
A3 not counted Corporate registrar fingerprint (brand-protection registrar, long prepaid term, registry locks)
registrar=GoDaddy.com, LLC created=2007-06-12 expires=2031-06-12 remaining_days=1740 locks=["delete","renew","transfer","update"]
 source
A4 not counted TLS certificate carries the organization name (OV/EV)
subject_org= validation_type=DV issuer=GoDaddy.com san_count=1
 TLS handshake nltk.org:443
B1 corroboration Wikidata official-website claim (P856) on the anchored item
qid=Q1635410 label=Natural Language Toolkit site=https://www.nltk.org/ sitelinks=18 competing_items=1
 source
B5 corroboration Tranco top-1M ranking
rank=61808 source=top-1m list
 source
B4 corroboration Wayback Machine history
first_snapshot=2007-07-09 history_days=6998
 source
3 piece(s) of evidence not counted — why
  • A1: GitHub organization has not verified this domain (is_verified != true)
  • A3: registrar (GoDaddy.com, LLC) is not a brand-protection registrar
  • A4: DV certificate carries no organization name (most modern tech companies use DV; this is expected)
Reproduce this yourself
# A1 — GitHub verified this org's domain
curl -s https://api.github.com/orgs/nltk | jq '{name, blog, is_verified}'

# A8 — anchored repo's homepage
curl -s https://api.github.com/repos/nltk/nltk | jq '{homepage, created_at, stargazers_count}'

# A3 — registrar / dates / locks
curl -sL https://rdap.org/domain/nltk.org | jq '{status, events, registrar: [.entities[]|select(.roles[]=="registrar")|.vcardArray[1][1][3]]}'

# B1 — Wikidata P856
curl -s "https://www.wikidata.org/w/api.php?action=wbgetclaims&entity=Q1635410&property=P856&format=json"

# B5 — Tranco rank
curl -s https://tranco-list.eu/api/ranks/domain/nltk.org

# B4 — first Wayback snapshot
curl -s "http://web.archive.org/cdx/search/cdx?url=nltk.org&limit=1&output=json"

# Re-run the whole pipeline for this domain
git clone https://github.com/zhouchungong/realurls-registry && cd realurls-registry && pip install -e . && python -m src.verify nltk.org

Think this is wrong? Open a dispute — the burden of proof is on us, and the record is downgraded while we check. Source record: YAML.