samba - Jun 2006 - smbstatus output question

Can anyone tell me how smbstatus does its host name resolution?

When I run smbstatus with no switches (3.0.20 on Suse 10.0), the output of
hosts mostly shows IP addresses, but a couple hosts will show up by name.
I've confirmed that all of the hosts are resolving in DNS through both
forward and backward lookups (dig and dig -x) from the Samba host. Also,
wins lookups also seem correct (nmblookup -A). Anyone know where smbstatus
gets that information?

Thanks
Steve