In python 2.7.13-2, if the 134th line of nip.py is as follows
match = re.findall('^(?:.+\.)?(\d{1,3}([-.])\d{1,3}\2\d{1,3}\2\d{1,3})$', subdomain)
The execution result of dig will be as follows.
$ dig 1.2.3.4.example.com +short @localhost
127.0.0.1
$
As a result of correcting the 134th line as follows,
match = re.findall('^(?:.+\.)?(\d{1,3}[-.]\d{1,3}[-.]\d{1,3}[-.]\d{1,3})$', subdomain)
The execution result of dig is corrected as follows.
$ dig 1-2-3-4.example.com +short @localhost
1.2.3.4
$
48cac19640