AS14148 Ex Libris (USA) Inc
2620:f0:c004::/48 - EXLIBRIS
V6NetHandle: NET6-2620-F0-C000-1 OrgID: ELU-2 Parent: NET6-2620-1 NetName: EXLIBRIS NetRange: 2620:F0:C000:: - 2620:F0:C00F:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment OriginAS: 14148 RegDate: 2016-01-04 Updated: 2016-01-04 Source: ARIN OrgID: ELU-2 OrgName: Ex Libris (USA) Inc CanAllocate: Street: 1350 E Touhy Ave. Street: STE 200 E City: DesPlaines State/Prov: IL Country: US PostalCode: 60018 Comment: ExLibris USA Inc. Comment: http://www.exlibrisgroup.com RegDate: 2014-02-05 Updated: 2017-11-18 OrgTechHandle: MARRI21-ARIN OrgNOCHandle: ITUS-ARIN OrgTechHandle: ITUS-ARIN OrgAdminHandle: ITUS-ARIN OrgAbuseHandle: ITUS-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.