mjhjmtu

I'd like to save my public IP address to a log file so I can use them to exclude my own visit to my websites in the stats collections.
At the moment I can see my actual public IP address--whatsmyip.org--but I believe that every time I off the modem, it changes.

I don't have a static public IP address, and I think there isn't a fixed range of IP that my ISP is giving me.

I'm running Linux Mint 17.3, is there any way that I've already a similar log file?
If not, can I track my future IPs and how?

This one will give you your public IP, remove /ip part to see more info.

$ curl ipinfo.io/ip

You can try to use some dynamic dns services like noip.com
Then You can access resources by dns name, which will changing according to Your ip.

Generally, Your provider may NAT with pool of addresses. And every curl https://ipinfo.io/ip request will return a random address from this pool, depends on the settings of the NAT.

It's better to use different methods to track visits to web-site. F.e. cookies.

Here is a small python code to put in cron and collect addresses:

#!/usr/bin/env python

from datetime import datetime
import os
import requests

LOG = '/tmp/ip.log'
URL = 'https://ipinfo.io/ip'

r = requests.get(URL)
if r.status_code == 200:
 ip = r.content.decode('ascii').rstrip('n')
 last_ip = None
 if os.path.exists(LOG):
 f = open(LOG, 'r')
 last_ip = f.readlines()[-1].split()[-1]
 f.close()
 if ip != last_ip:
 f = open(LOG, 'a')
 f.write(" n".format(datetime.now(), ip))

Add this line to your crontab file (crontab -e) to write the date and your public IPv4 address to a file called ip_public.txt, saved in your home directory, every day at 12:00 AM.

0 0 * * * echo $(date +%Y-%m-%d) $(curl https://ipinfo.io/ip 2>/dev/null) >> ~/ip_public.txt 2>&1