Here is some info from ZoneAlarm. The address it refers to appear to be a DNS server from Road Runner. I've only seen this a couple times in the past week or two, and in both cases it asked for access several times in a row. I can't see any pattern to what triggers the attempted access, or why it only happens every several days.
OrgName: Road Runner HoldCo LLC
OrgID: RRWE
Address: 13241 Woodland Park Road
City: Herndon
StateProv: VA
PostalCode: 20171
Country: US
ReferralServer: rwhois://ipmt.rr.com:4321
NetRange: 66.74.0.0 - 66.75.255.255
CIDR: 66.74.0.0/15
NetName: RR-WEST-2BLK
NetHandle: NET-66-74-0-0-1
Parent: NET-66-0-0-0-0
NetType: Direct Allocation
NameServer: DNS1.RR.COM
NameServer: DNS2.RR.COM
NameServer: DNS3.RR.COM
NameServer: DNS4.RR.COM
Comment: ADDRESSES WITHIN THIS BLOCK ARE NON-PORTABLE
RegDate: 2001-01-30
Updated: 2003-02-11
RTechHandle: ZS30-ARIN
RTechName: ServiceCo LLC
RTechPhone: +1-703-345-3416
RTechEmail: abuse@rr.com
OrgAbuseHandle: ABUSE10-ARIN
OrgAbuseName: Abuse
OrgAbusePhone: +1-703-345-3416
OrgAbuseEmail: abuse@rr.com
OrgTechHandle: IPTEC-ARIN
OrgTechName: IP Tech
OrgTechPhone: +1-703-345-3416
OrgTechEmail: abuse@rr.com
# ARIN WHOIS database, last updated 2006-06-06 19:10
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