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From these I gather that besides ip addresses you also want to collect IP CIDR ranges. If so, you were close:

egrep -o '[0-9]+[.][0-9]+[.][0-9]+[.][0-9]+(/[0-9]+)?' file1

or

grep -Eo...

IP groups for each line:

perl -nle '@ip=/(\d+\.\d+\.\d+\.\d+)/g and print "@ip"' file1
110.20.20.21 10.25.22.21 10.25.22.26
110.24.18.30 10.56.34.33
110.56.22.23 10.56.22.27
110.24.89.60...

perl -lne 'print if s/.*?(\d+\.\d+\.\d+\.\d+)\D*/ $1/g' file1Your egrep attempt was close:
egrep -o '[0-9]+[.][0-9]+[.][0-9]+[.][0-9]+' file1

grep for /(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})/

cat <filename> |grep (\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})

First: tools like grep will not help you because they filter certain lines (in which a certain regexp is found) only without modifying them. If you want only the IP addresses alone with no other text...