2001:4998:130::/44 - YAHOO-IPV6-BLK-2
V6NetHandle: NET6-2001-4998-1 OrgID: YAOO Parent: NET6-2001-4800-0 NetName: YAHOO-IPV6-BLK-2 NetRange: 2001:4998:: - 2001:4998:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation RegDate: 2005-10-27 Updated: 2012-03-02 AbuseHandle: NETWO857-ARIN Source: ARIN OrgID: YAOO OrgName: Yahoo! CanAllocate: Street: 701 First Ave City: Sunnyvale State/Prov: CA Country: US PostalCode: 94089 RegDate: 1970-01-01 Updated: 2017-01-28 OrgTechHandle: NA258-ARIN OrgAbuseHandle: NETWO5978-ARIN OrgAdminHandle: NA258-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.