I can’t count the number of times I wish I had a tool that just ……. Many times, the tool exists, but part of a network management suite or solution which is not practical to install and configure for a simple test or the odd troubleshooting task. In this video I will show you a small piece of code that I wrote to record DNS response time. Here is the code below for you to simply cut and paste. import csv import datetime import time import dns.resolver

DNS name to resolve

domain_name = "thetechfirm.com"

Number of times to measure DNS response time

num_measurements = 100 counter = 0 delay = 1

print("Tonys DNS response time utility") print("Performing name lookups for", domain_name, num_measurements, "times with a ", delay, "second delay")

Create CSV file and write header row

with open('dns_response_times.csv', mode='w') as csv_file: fieldnames = ['Date', 'Response Time (ms)'] writer = csv.DictWriter(csv_file, fieldnames=fieldnames) writer.writeheader()

# Measure DNS response time multiple times and write results to CSV file
for i in range(num_measurements):
    counter = counter+1
    start_time = time.time()
  # Perform DNS resolution
    resolver = dns.resolver.Resolver()
    resolver.nameservers = ['8.8.8.8'] # Google DNS server
    answer = dns.resolver.resolve(domain_name)

    end_time = time.time()
    response_time_ms = (end_time - start_time) * 1000

    # Write result to CSV file
    writer.writerow({'Date': datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"), 'Response Time (ms)': response_time_ms})

    print("Testing", domain_name, "#", counter,response_time_ms,"ms")
    time.sleep(delay)

... https://www.youtube.com/watch?v=W7wymOhQlSc