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Alternative spelling of black hole, especially in the attributive.
(noun)
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A place where traffic is silently discarded.
(noun)
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A bit bucket; a place of permanent oblivion for data.
(noun)
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DNSBL, used to block spamming IP addresses – are often called "blackhole lists"
(noun)
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A blackhole server, a DNS server that handles reverse lookups of invalid IP ranges
(noun)
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