2607:3500:f00::/40 - ARINC-NET-IPV6
V6NetHandle: NET6-2607-3500-1 OrgID: ARINC-2 Parent: NET6-2600-1 NetName: ARINC-NET-IPV6 NetRange: 2607:3500:: - 2607:3500:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 11228, 17366 RegDate: 2012-03-23 Updated: 2012-03-23 Source: ARIN OrgID: ARINC-2 OrgName: ARINC, Inc. CanAllocate: Street: 2551 Riva Road City: Annapolis State/Prov: MD Country: US PostalCode: 21401 RegDate: 1992-07-16 Updated: 2017-01-28 OrgAdminHandle: JMS195-ARIN OrgAbuseHandle: JODIA-ARIN OrgNOCHandle: JODIA-ARIN OrgTechHandle: JODIA-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.