AS10616 National Technical Information Service
2610:20:1000::/40 - USDOC-6NET
V6NetHandle: NET6-2610-20-1 OrgID: UDC-8 Parent: NET6-2610-1 NetName: USDOC-6NET NetRange: 2610:20:: - 2610:20:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation RegDate: 2006-02-08 Updated: 2012-09-14 TechHandle: DBA241-ARIN AbuseHandle: MARAY-ARIN TechHandle: DB983-ARIN NOCHandle: MARAY-ARIN TechHandle: MARAY-ARIN Source: ARIN OrgID: UDC-8 OrgName: U.S. Dept. of Commerce CanAllocate: Street: Office of Chief Information Officer Street: 1401 Constitution Ave, N.W. City: Washington State/Prov: DC Country: US PostalCode: 20230 RegDate: 1993-11-11 Updated: 2017-08-14 OrgTechHandle: MARAY-ARIN OrgNOCHandle: MARAY-ARIN OrgAbuseHandle: MARAY-ARIN OrgAdminHandle: MARAY-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.