QNAME Minimization and Spamhaus DNSBLs
ID: efff040b-49a8-544b-bd39-6b0d33416d39
STIX ID: report--efff040b-49a8-544b-bd39-6b0d33416d39
Feed Name: The Spamhaus Project
The report explains that QNAME minimization causes recursive resolvers to query DNSBL zones item-by-item, turning a single lookup into many sequential queries (up to 33 for IPv6 and ~5× for IPv4). This dramatically increases latency and load on Spamhaus's DNSBL infrastructure and degrades email ecosystem performance, creating an operational problem for high-volume DNSBL providers.
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