For those who don't want to or can't use dynamic DNS but need to be able to access their network from anywhere

ipnotify.py

#!/usr/bin/env python3

from time import sleep
from urllib.parse import urlencode
import subprocess as sp
import httplib2
import json
import sys
import re

IP_COMMAND = """curl -s http://checkip.dyndns.org | sed 's/[a-zA-Z/<> :]//g'"""
PUSHBULLET_API_KEY = # Your Pushbullet key here
IP_REGEX = re.compile("\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}")

devices = None
current_ip = None

http = httplib2.Http(".cache")
http.add_credentials(PUSHBULLET_API_KEY, None)

def valid_ip(candidate):
    if IP_REGEX.match(candidate):
        return True
    else:
        return False

def pusbullet_devices():
    req, body = http.request("https://api.pushbullet.com/api/devices")
    return json.loads(body.decode('utf-8'))['devices']

def check_ip():
    ipstr = sp.check_output(IP_COMMAND, shell=True)
    ipstr = ipstr.decode("ascii")[:-2]
    return ipstr

def upload_ip():
    global devices
    for device in devices:
        body = { "type": "note", "title": "[auto] My Public IP",
                "body": current_ip, "device_iden": device["iden"]}
        body = urlencode(body)
        req, respbody = http.request("https://api.pushbullet.com/api/pushes", 'POST', body=body)
        if(int(req['status']) == 400):
            raise AttributeError("Bad Request returned by server")
        elif(int(req['status']) == 401 or int(req['status']) == 403):
            raise PermissionError("No or invalid API key")
        elif(int(req['status']) >= 500):
            raise RuntimeError("Pushbullet returned HTTP code {}".format(req['status']))

def run_once():
    global current_ip
    new_ip = check_ip()
    if not current_ip == new_ip:
        if not valid_ip(new_ip):
            run_once()
        else:
            print("New IP detected: {}.".format(new_ip))
            current_ip = new_ip
            upload_ip()

def setup():
    global devices 
    devices = pusbullet_devices()
    global current_ip
    current_ip = "0.0.0.0"

if __name__ == '__main__':
    setup()
    while(True):
        try:
            run_once()
            sleep(60)
        except KeyboardInterrupt:
            print("Exitting.")
            sys.exit(0)