AS11985 Social Security Administration
2001:1930:d00::/40 - SSA-V6
V6NetHandle: NET6-2001-1930-1 OrgID: SSA-6 Parent: NET6-2001-1800-0 NetName: SSA-V6 NetRange: 2001:1930:: - 2001:1930:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation RegDate: 2004-02-17 Updated: 2013-06-11 TechHandle: RT130-ARIN Source: ARIN OrgID: SSA-6 OrgName: Social Security Administration CanAllocate: Street: 6401 Security Boulevard City: Baltimore State/Prov: MD Country: US PostalCode: 21235 RegDate: 1990-01-03 Updated: 2017-01-28 OrgAbuseHandle: KHUUL-ARIN OrgAbuseHandle: JED77-ARIN OrgAdminHandle: ELTER1-ARIN OrgTechHandle: KHUUL-ARIN OrgTechHandle: JED77-ARIN Source: ARIN
IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.
Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.