AS577 Bell Canada
2605:b100:300::/40 - ONTOR-2605-B100-300
V6NetHandle: NET6-2605-B100-300-1 OrgID: BELLM-8 Parent: NET6-2605-B100-1 NetName: ONTOR-2605-B100-300 NetRange: 2605:B100:300:: - 2605:B100:3FF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: reassignment OriginAS: 36522 RegDate: 2018-10-29 Updated: 2018-10-29 Source: ARIN OrgID: BELLM-8 OrgName: Bell Mobility, Inc. CanAllocate: Street: 70 Queen Elizabeth Blvd City: Etobicoke State/Prov: ON Country: CA PostalCode: M8Z-1M3 RegDate: 2008-04-18 Updated: 2008-04-18 OrgTechHandle: WNNOC1-ARIN OrgNOCHandle: WNNOC1-ARIN OrgAdminHandle: WNNOC1-ARIN OrgAbuseHandle: MAHD-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.