"Connections to this Domain Controller from client machines whose IP addresses don't map to any of the existing sites in the enterprise"

HI

Running Windows 2003 DC's and I am seeing the following errors in the Event log:

"During the past 4.25 hours there have been 185 connections to this Domain Controller from client machines whose IP addresses don't map to any of the existing sites in the enterprise"

I checked out the corresponding logs which showed client connecting with "'NO_CLIENT_SITE:" which infers they're in a subnet which has not been defined in AD Sites and Services.

Is this something to worry about? Am I correct in thinking that they would connect to the nearest site anyway?