blackhole

black +‎ hole

blackhole (plural blackholes)

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

   One way of fighting spam is to use a blackhole list maintained on a blackhole server.

6. (management) A resource sink.

blackhole (third-person singular simple present blackholes, present participle blackholing, simple past and past participle blackholed)

1. (transitive, Internet) To redirect (network traffic, etc.) nowhere; to discard incoming traffic.
   • 2005, Victor Oppleman, Oliver Friedrichs, Brett Watson, Extreme exploits: advanced defenses against hardcore hacks (page 186)

     Select a nonglobally routed prefix, such as the Test-Net (RFC 3330) 192.0.2.0/24, to use as the next hop of any attacked prefix to be blackholed.