changelog
    
    
    - Wed, 27 Jan 2021 19:01:37 +0200
 
    - by Teemu Piippo <teemu@hecknology.net> [Wed, 27 Jan 2021 19:01:37 +0200] rev 188
 
    - validate the ip address octets better
 
    - Wed, 27 Jan 2021 18:55:14 +0200
 
    - by Teemu Piippo <teemu@hecknology.net> [Wed, 27 Jan 2021 18:55:14 +0200] rev 187
 
    - fixed an off-by-one error
 
    - Wed, 27 Jan 2021 18:55:03 +0200
 
    - by Teemu Piippo <teemu@hecknology.net> [Wed, 27 Jan 2021 18:55:03 +0200] rev 186
 
    - cleanup ip address code