If your firewall drops the packages (ZA does this when internet security level set to "high") you don't have to worry about those warnings, if you see many times the same IP, you could contact the IP adress owner. For the IP you mentioned 64.66.8.35 :

4D communications (NETBLK-4DCOMM)
3350 Sports Arena Blvd. Suite K
San Diego, CA 92110
US

Netname: 4DCOMM
Netblock: 64.66.0.0 - 64.66.31.255
Maintainer: 4DCO

Coordinator:
Colina, Jose E (JEC3-ARIN) netops@4d.net
(619)523-2721 Ext. 324 (FAX) 619-521-2614

About your first alerts:

Pac-West Telecomm, INC. (NETBLK-MDSG-PACWEST)
1776 W. March Lane, Suite 250
Stockton, CA 95207
US

Netname: MDSG-PACWEST
Netblock: 64.66.192.0 - 64.66.223.255
Maintainer: PWTI

Coordinator:
Pac-West Telecomm Inc. (ZP86-ARIN) ipadmin@mdsg-pacwest.com
1-800-722-9378

Perhaps this is your own ISP ?
And like said before by iNViCTuS the destination is in the multicast / netcast adress range. NET-MCAST-NET, so it is not traffic targeted at your box only.
It could be some router problem by an ISP or ZA acting to sensitive.
Some ISP's also perform a check on their networks (like a ping) everytime you log in or they could be doing this at certain or at random times.

I believe this info was alos provided in the above posts, but this is a sort of summary of the possibilities and solutions mentioned above. I hope this helped