DNSRBL (Domain Name System Real-Time Blocklist)
A DNSRBL (Domain Name System Blackhole List, Domain Name System Blacklist, RBL, Real-time Blackhole list) is a hosted real-time list that uses DNS as the mechanism for a database lookup to determine the trustworthiness of an IP, domain name, a URL, email address or file.
The functions and operations of DNSRBLs are defined by RFC5782.
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