AS11979 Bluegrass Network LLC
2607:f9d0:800::/40 - BLUEGRASS-2
V6NetHandle: NET6-2607-F9D0-1 OrgID: BLUE Parent: NET6-2600-1 NetName: BLUEGRASS-2 NetRange: 2607:F9D0:: - 2607:F9D0:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 11979 RegDate: 2009-05-06 Updated: 2012-03-02 NOCHandle: NA175-ARIN TechHandle: NA175-ARIN AbuseHandle: NA175-ARIN Source: ARIN OrgID: BLUE OrgName: Bluegrass Network LLC CanAllocate: Street: 2902 Ring Road City: Elizabethtown State/Prov: KY Country: US PostalCode: 42701 RegDate: 1996-06-16 Updated: 2017-01-28 ReferralServer: rwhois://rwhois.blue.net:4321 OrgNOCHandle: NA175-ARIN OrgTechHandle: NA175-ARIN OrgAbuseHandle: NA175-ARIN OrgAdminHandle: NA175-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.