SIGKILL

[japc@morgoth:~]$ dig ns 1.2.2.10.in-addr.arpa @BLACKHOLE-1.IANA.ORG.

; <<>> DiG 9.4.2b1 <<>> ns 1.2.2.10.in-addr.arpa @BLACKHOLE-1.IANA.ORG.
;; global options:  printcmd
;; connection timed out; no servers could be reached