[AusNOG] Viewing RBL's on entire /24

[Ross Wheeler]

> Gday Guys
> 
> I was wondering if anybody might be able to recommend a way for me to do 
> a RBL lookup on an entire /24 rather then looking up each IP separately
> 
> Looking forward to your response.

FUGLY and SLOW... one-line PoC:

$ echo "103.18.207.0" | awk -F. '{for(ip=1; ip<255; ip++) { q=sprintf("dig 
+short %d.%d.%d.%d.zen.spamhaus.org A",ip,$3,$2,$1); q|getline; close(q)} 
if($NF>0) print "BAD"; else print "CLEAN"}'
CLEAN

$ echo "200.50.3.0" | awk -F. '{for(ip=1; ip<255; ip++) { q=sprintf("dig 
+short %d.%d.%d.%d.zen.spamhaus.org A",ip,$3,$2,$1); q|getline; close(q)} 
if($NF>0) print "BAD"; else print "CLEAN"}'
BAD