2604:9b00:2400::/38 - INVOLTA-IPV6-01
V6NetHandle: NET6-2604-9B00-1 OrgID: INVOL-1 Parent: NET6-2600-1 NetName: INVOLTA-IPV6-01 NetRange: 2604:9B00:: - 2604:9B00:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 14230 RegDate: 2011-04-28 Updated: 2012-02-24 Source: ARIN OrgID: INVOL-1 OrgName: Involta CanAllocate: Street: P.O. Box 1986 City: Cedar Rapids State/Prov: IA Country: US PostalCode: 52406 Comment: http://www.involta.com RegDate: 2008-03-31 Updated: 2018-09-13 OrgAdminHandle: IIA12-ARIN OrgAbuseHandle: INVOL2-ARIN OrgTechHandle: IYRCA-ARIN OrgTechHandle: IIA12-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.