DNS host name

What is your DNS Resolution set to under NTA settings?

It is set to persistent

Set it to On Demand and check your results. It should perform DNS lookups for IP hosts as needed and will display names where resolvable.

Now, NTA won't show you a simple hostname like 'www.google.com', since the Netflow table refers to the resolution of the specific IP to which the client is connecting. You'll likely see lots of CDN providers (akamai and the like).

If the IP resolves to a nice, simple name then you're good.

For example, here's a quick scrape of some talkers:

Well, glad I checked - I had the persistent piece wrong.

Here's the relevant excerpt from NTA help -

Configuring DNS Resolution

By default for new installations, NTA resolves the domain names of all endpoints referenced in monitored Flows on demand. For most users, on demand DNS resolution optimizes overall performance. To meet your specific network monitoring needs, NTA provides the following options for configuring DNS resolution:

Note: Top Domains resources and Orion reports that include DNS names require persistent domain name resolution.

Warning: Top Domains resources and Orion reports that include DNS names require persistent domain name resolution, so they will not display DNS names if On Demand DNS resolution is enabled.

Warning: If DNS resolution is disabled, all DNS information will be deleted from the database to improve database performance,

NTA also allows you to configure the interval between DNS lookups. NTA performs regular DNS lookups on all monitored devices. By default, if the domain of a monitored device resolves successfully, NTA will not attempt another DNS lookup on the same device for 7 days. If the domain name of a monitored device does not resolve successfully, by default, Orion will attempt to resolve the same device again in 2 days.