Search FCC Electronic Comment Filing System (ECFS) filings for a proceeding/docket (e.g. 17-108 net neutrality, 11-42 Lifeline). Optionally filter by filer name. Returns the newest filings with the submission id, filer, type, lead bureau, received/disseminated dates, and document count. Public-domain federal data. Track FCC regulatory dockets, comments, and ex-parte filings an LLM can't recite fresh.