2001:500:8d::/48 - ICANN-DNS-SERVERS-V6
V6NetHandle: NET6-2001-500-8C-1 OrgID: ICANN Parent: NET6-2001-400-0 NetName: ICANN-DNS-SERVERS-V6 NetRange: 2001:500:8C:: - 2001:500:8F:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment Comment: a-d.iana-servers.net Comment: a-d.icann-servers.net RegDate: 2010-03-24 Updated: 2015-02-03 NOCHandle: LNO25-ARIN Source: ARIN OrgID: ICANN OrgName: ICANN CanAllocate: Street: 12025 Waterfront Dr. Street: Suite 300 City: Los Angeles State/Prov: CA Country: US PostalCode: 90094 RegDate: 2001-03-30 Updated: 2018-04-04 OrgTechHandle: JENKI373-ARIN OrgTechHandle: DSO63-ARIN OrgTechHandle: DCL131-ARIN OrgAdminHandle: JENKI373-ARIN OrgAbuseHandle: ICANN-NET OrgTechHandle: MANDE13-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.