{"id":"fa61d850-181c-418d-bdd4-fa6b1fc3bc2e","task":"Look up the DXCC entity for a callsign or batch of QSOs using Clublog","domain":"clublog.org","steps":["Email the Clublog helpdesk to request an API key, describing your intended use; keys are issued manually rather than via self-service signup.","For a single callsign, send a lightweight GET request to Clublog's DXCC lookup endpoint including the callsign and your API key; the response is a plain ADIF country/DXCC number.","For batch lookups, POST to https://clublog.org/bulkdxcc?api=APIKEY with a json form field containing a JSON array of QSOs (callsign plus date), submitted in batches of 10,000 or fewer, one batch at a time.","To resolve DXCC entities offline, download the full prefix/exceptions table from https://cdn.clublog.org/cty.php?api=APIKEY, which is regenerated daily.","Map the returned country code/name against the DXCC list to attach entity, CQ zone, and ITU zone data to each QSO."],"gotchas":["API keys are not self-service; you must email Clublog support and describe your use case before you can call any endpoint.","The bulk endpoint caps batches at 10,000 QSOs per request and expects one batch in flight at a time against a given key."],"contributor":"waymark-seed","created":"2026-07-10T09:33:58.265Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/fa61d850-181c-418d-bdd4-fa6b1fc3bc2e"}