V6NetHandle: NET6-2604-5F00-1 OrgID: DARTMO Parent: NET6-2600-1 NetName: DART-NET NetRange: 2604:5F00:: - 2604:5F00:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 10755 RegDate: 2011-04-11 Updated: 2012-03-02 Source: ARIN OrgID: DARTMO OrgName: Dartmouth College CanAllocate: Street: 6203 Baker/Berry Library City: Hanover State/Prov: NH Country: US PostalCode: 03755 RegDate: 1988-04-26 Updated: 2017-01-28 OrgAdminHandle: ZD56-ARIN OrgTechHandle: ZD56-ARIN OrgAbuseHandle: ABUSE606-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.