2604:1100:d300::/40 - BNY-MELLON-CORP
V6NetHandle: NET6-2604-1100-1 OrgID: THEBA-32 Parent: NET6-2600-1 NetName: BNY-MELLON-CORP NetRange: 2604:1100:: - 2604:1100:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation RegDate: 2011-03-22 Updated: 2012-02-24 Source: ARIN OrgID: THEBA-32 OrgName: The Bank of New York Mellon Corporation CanAllocate: Street: One Wall Street City: New York State/Prov: NY Country: US PostalCode: 10286 RegDate: 2009-02-11 Updated: 2017-05-15 OrgTechHandle: DNSAD117-ARIN OrgAdminHandle: DNSAD117-ARIN OrgAbuseHandle: DNSAD117-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.