http://www.westnet.com.au/tryan/list.html

I just found 38 addresses that tried to scan my PC.. Make sure you are keeping peerguardian up-to-date if you are using it. It is ineffective if you are not adding new IP ranges to block.

The bulk of my scans were done by this IP address:
216.73.87.22

Which when I did a trace came back with this information:

OrgName: Double Click, Inc.
OrgID: DOUBLE-3
Address: 450 West 33rd Street 16th floor
City: New York
StateProv: NY
PostalCode: 10001
Country: US

NetRange: 216.73.80.0 - 216.73.95.255
CIDR: 216.73.80.0/20
NetName: DOUBLECLICK-NET
NetHandle: NET-216-73-80-0-1
Parent: NET-216-0-0-0-0
NetType: Direct Assignment
NameServer: NS1.DOUBLECLICK.NET
NameServer: NS2.DOUBLECLICK.NET
NameServer: NS3.DOUBLECLICK.NET
NameServer: NS4.DOUBLECLICK.NET
Comment:
RegDate: 2001-07-12
Updated: 2003-06-11

TechHandle: AN1068-ARIN
TechName: Ng, Alex
TechPhone: +1-212-683-0001
TechEmail: [email protected]

OrgTechHandle: AN1068-ARIN
OrgTechName: Ng, Alex
OrgTechPhone: +1-212-683-0001
OrgTechEmail: [email protected]

ARIN WHOIS database, last updated 2003-07-29 19:15
Enter ? for additional hints on sear

So I have now banned all Ips that begin with 216 from connecting to my PC. That should stop them for a while.