Define a range, return all numbers of range that are NOT in csv data

[KiNeMs]

I Suppose I d0nt know where to start with this kind of code.

I have built a part of script that asks the user to enter a number then return the row of that number within the csv file. I would like to put in the option for input to either search for a particular number and return the informaiton, or search for a range and return all numbers that are not included.

the code I have for the searching of a single number is

import csv
import codecs

# Open using dictReader
with open('AssignedLineURI.csv', 'rt') as AssignedLineURI:
    # Open file in UTF Codec
    csv_data = csv.DictReader(codecs.open('AssignedLineURI.csv', 'rU', 'utf-16', ),delimiter =';')

    # Input
    # Get Number in 10 digit format from input
    csenteredNumber = input("Enter User's Line Number in E164 Format: ")
    csLineURI = "tel:" + csenteredNumber + ";ext=" + csenteredNumber[-5:]
    # print(csLineURI)
    
    # Match Line URI to User
    for row in csv_data:
        if row['LineURI'] == csLineURI:
            print (row['DisplayName'] + " - " + row['SipAddress'] + " - " + row['DID'])

This will prompt input for a telephone number, search the csv, and return the fields specified in the row.

Im assuming to being my search of number not contained in the csv file, I would need to define a range, create a loop to search each number in the range and return if NOT in matching csv.