What's FQDN of a WORKGROUP pc?

Workgroup computers don't have an FQDN unless you specifically configure them to have one. They have only a NetBIOS (single label) name.

Also, don't confuse the Primary DNS suffix with the DNS suffix search list as assigned by DHCP because they're two different things.


It would be PCNAME.

That's PCNAME plus a dot.


For Windows PCs you can check with:

ipconfig /all

Giving:

Host Name . . . . . . . . . . . . : PCNAME

Primary Dns Suffix . . . . . . . : local

FQDN = Hostname + Primary DNS Suffix

So in this case: PCNAME.local