I tested the new script with these test IP ranges and it didn't correctly convert the IP ranges to CIDR blocks so I initially thought it wasn't working correctly. The script does not work with this specific field separator " - ":

Code:

1.62.189.215 - 1.62.189.222
4.0.25.146 - 4.0.25.148
4.0.26.14 - 4.0.29.24
24.149.30.0 - 24.149.30.4

--- Post updated 12-21-18 at 04:23 AM ---

Edit:

I removed the space between the IP address range from the test IP ranges and the script correctly converted the the IP ranges.

Code:

1.62.189.215-1.62.189.222
4.0.25.146-4.0.25.148
4.0.26.14-4.0.29.24
24.149.30.0-24.149.30.4

I also copied the test IP ranges directly from the downloaded file in question without any changes to each line and it converts properly.

Code:

# List distributed by iblocklist.com

botnet on China Unicom Heilongjiang:1.62.189.215-1.62.189.222
s0-0.ciscoseattle.bbnplanet.net:4.0.25.146-4.0.25.148
p1-0.cisco.bbnplanet.net:4.0.26.14-4.0.29.24
CEDAR FALLS UTILITIES:24.149.30.0-24.149.30.4

I added space hyphen space to the field separators and it converts my first test IP range correctly.

Code:

BEGIN{
        FS="-| - |:"
}

Thank you! The script works absolutely great! I compared the script results against ipcalc results and they were exactly the same.