AS701 MCI Communications Services, Inc. d/b/a Verizon Business
2600:40ff:fff9::/48 - DCA6-INET-V6
V6NetHandle: NET6-2600-40FF-FFF9-1 OrgID: MCS-351 Parent: NET6-2600-4000-1 NetName: DCA6-INET-V6 NetRange: 2600:40FF:FFF9:: - 2600:40FF:FFF9:FFFF:FFFF:FFFF:FFFF:FFFF NetType: reassignment RegDate: 2019-04-18 Updated: 2019-04-18 Source: ARIN OrgID: MCS-351 OrgName: Verizon Business (MCICS) CanAllocate: Street: 22001 Loudoun County Pkwy City: Ashburn State/Prov: VA Country: US PostalCode: 20147 RegDate: 2016-10-07 Updated: 2019-04-04 OrgTechHandle: NETWO8887-ARIN OrgTechHandle: BTA80-ARIN OrgNOCHandle: BTA80-ARIN OrgAdminHandle: BTA80-ARIN OrgAbuseHandle: BTA80-ARIN Source: ARIN POCHandle: BTA80-ARIN IsRole: Y LastName: Beltway Testbed Administrator FirstName: Street: 22001 Loudoun County Pkwy City: Ashburn State/Prov: VA Country: US PostalCode: 20147 RegDate: 2016-10-06 Updated: 2018-10-08 OfficePhone: +1-703-694-4900 Mailbox: firstname.lastname@example.org 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.