Prevents connections from IP address ranges.
The demo app prevents connections from localhost over ipv4 and ipv6.
$ python test.py SILENT
127.0.0.1 No connections from localhost
::1 No connections from localhost
192.168.122.1 Howdy, stranger!
172.31.247.135 Howdy, stranger!
[ERROR] Could not connect to fe80::42a8:e0ff:fe68:d9a3 on port 58287
192.168.99.1 Howdy, stranger!
[ERROR] Could not connect to fe80::250:46ff:fec0:8 on port 38483
172.16.16.1 Howdy, stranger!
[ERROR] Could not connect to fe80::250:76ff:fec0:1 on port 34708