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Shell examples

Sort IP adresses

sort -n -t . -k 1,1 -k 2,2 -k 3,3 -k 4,4

https://www.madboa.com/geek/sort-addr/

Scan PTR records

for i in `seq 1 254`; do host 192.168.1.$i 192.168.1.1; done |grep pointer