ISP Cached DNS Lookup

What is this tool?

This tool lets you look up a DNS record at the DNS servers of many popular Internet providers. This lets you see which one(s) have cached DNS entries. That way, if you just made a DNS change, you can see when major ISPs will detect the change. Note that this test is specially designed so that it instructs the DNS server not to add the DNS record to its cache, if it is not already there (so future lookups will not be spoiled).

How do the results help me?

  • DNS Troubleshooting

If you want to make sure that your DNS entries are propagating in a timely manner, this tool can help you determine who knows about your DNS changes and who doesn't.