Domain Name System blocklist - WikipediaThis article may need to be rewritten to comply with Wikipedia's quality standards. You can help. The talk page may contain suggestions. (September 2019) A Domain Name System blocklist, Domain Name System-based blackhole list, Domain Name System blacklist (DNSBL) or real-time blackhole list (RBL) is a service for operation of mail servers to perform a check via a Domain Name System (DNS) query whe
