{"kind":"tools","id":"blacklist","slug":"blacklist","name":"Blacklist Checker","description":"Queries well-known DNS blacklists to see whether an IPv4 address or a domain is listed — the usual explanation when mail is being rejected or silently dropped.","website":"https://openvibe.tools/tool/blacklist","sources":[{"url":"https://openvibe.tools/api/v1/tools","checked_at":"2026-11-13T05:45:05.242Z"}],"last_checked":"2026-11-13T05:45:05.242Z","group":"net"}