They're the IP addresses of the DNS server, obviously these are public IP addresses. Here's the WHOIS entry associated with one of them:
4.2.2.1
OrgName: Level 3 Communications, Inc.
Address: 1025 Eldorado Blvd.
City: Broomfield
StateProv: CO
PostalCode: 80021
Country: US
Comment:
RegDate: 1998-05-22
Updated: 2003-11-06
AbuseHandle: APL8-ARIN
AbuseName: Abuse POC LVLT
AbusePhone: +1-877-453-8353
AbuseEmail:
abuse@level3.com
AdminHandle: APL7-ARIN
AdminName: ADMIN POC LVLT
AdminPhone: +1-877-453-8353
AdminEmail:
ipaddressing@level3.com
TechHandle: TPL1-ARIN
TechName: Tech POC LVLT
TechPhone: +1-877-453-8353
TechEmail:
ipaddressing@level3.com
TechHandle: ARINC4-ARIN
TechName: ARIN Contact
TechPhone: +1-800-436-8489
TechEmail:
arin-contact@genuity.com
# ARIN WHOIS database, last updated 2004-09-24 19:10
# Enter ? for additional hints on searching ARIN's WHOIS database.
OrgID: LVLT
Address: 1025 Eldorado Blvd.
City: Broomfield
StateProv: CO
PostalCode: 80021
Country: US
NetRange: 4.0.0.0 - 4.255.255.255
CIDR: 4.0.0.0/8
NetName: LVLT-ORG-4-8
NetHandle: NET-4-0-0-0-1
Parent:
NetType: Direct Allocation
NameServer: NS1.LEVEL3.NET
NameServer: NS2.LEVEL3.NET
Comment:
RegDate:
Updated: 2004-06-04
OrgAbuseHandle: APL8-ARIN
OrgAbuseName: Abuse POC LVLT
OrgAbusePhone: +1-877-453-8353
OrgAbuseEmail:
abuse@level3.com
OrgTechHandle: TPL1-ARIN
OrgTechName: Tech POC LVLT
OrgTechPhone: +1-877-453-8353
OrgTechEmail:
ipaddressing@level3.com
OrgTechHandle: ARINC4-ARIN
OrgTechName: ARIN Contact
OrgTechPhone: +1-800-436-8489
OrgTechEmail:
arin-contact@genuity.com
# ARIN WHOIS database, last updated 2004-09-24 19:10
