Whois shows as avenquest software.
network:Class-Name:network
network:ID:NET-XO-NET-d11f6100
network:Auth-Area:209.31.0.0/16
network:Network-Name:XO-NET-d11f6100
network:Organization;I:AVANQUEST SOFTWARE (252391-1)
network:IP-Network:209.31.97.0/24
network:Admin-Contact;I:XCIA-ARIN
network:Tech-Contact;I:XCIA-ARIN
network:Created:20061128
network:Updated:20061212
are you using any of there software ?
http://www.avanquest.com/
if so maybe just one of them trying to get updates.