Look for local IP blocks in Maxmind data

LocalIPs.py

import csv

# data source is here https://dev.maxmind.com/geoip/geoip2/geoip2-csv-databases/

# lat column = -2
# long column = -1

# Set up bounding box in a very bad way
minlat = 26.3
maxlat = 27.52
minlong = -80.9
maxlong = -79.95

with open('local.csv', 'wb') as outfile:
    put = csv.writer(outfile)
    with open('GeoLite2-City-Blocks-IPv4.csv', 'rb') as infile:
        sourcecsv = csv.reader(infile)
        headers = sourcecsv.next()
        headers.append("latlong")
        put.writerow(headers)
        for myrow in sourcecsv:
            try:                                # If lat or long is mangled, it won't convert to a float, so we'll give it a bad value
                mylat = float(myrow[-2])
            except ValueError:
                mylat = -181
            try:
                mylong = float(myrow[-1])
            except ValueError:
                mylong = -181
            
            if mylat >= minlat and mylat <= maxlat and mylong >= minlong and mylong <= maxlong:
                myrow.append(myrow[-2] + ", " + myrow[-1])      # append "lat, long"
                put.writerow(myrow)