2604:1280:a::/48 - ISGIL-IPV6-1
V6NetHandle: NET6-2604-1280-1 OrgID: ISGIL Parent: NET6-2600-1 NetName: ISGIL-IPV6-1 NetRange: 2604:1280:: - 2604:1280:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 11696 RegDate: 2012-08-30 Updated: 2012-08-30 Source: ARIN OrgID: ISGIL OrgName: NBS CanAllocate: Street: 155 Willowbrook lvd City: Wayne State/Prov: NJ Country: US PostalCode: 07470 Comment: http://www.nbsvoice.com Comment: NOC: 973-638-2100 x2 RegDate: 2010-04-27 Updated: 2018-09-11 OrgTechHandle: GEORG13-ARIN OrgAbuseHandle: NOC11449-ARIN OrgTechHandle: NETWO7814-ARIN OrgNOCHandle: NOC11449-ARIN OrgAdminHandle: GEORG13-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.