Facebook IP addresses can be obtained with the following command:-
whois -h whois.radb.net -- '-i origin AS32934' | awk '/^route:/ {print $2;}' | sort -n -t . -k 1,1 -k 2,2 -k 3,3 -k 4,4 | uniq
whois -h whois.radb.net -- '-i origin AS32934' | awk '/^route:/ {print $2;}' | \
sort -n -t ...