AS1215 Oracle Corporation
2606:b400:8301::/48 - ORACLE-CORP-V6
V6NetHandle: NET6-2606-B400-1 OrgID: ORACLE-4 Parent: NET6-2600-1 NetName: ORACLE-CORP-V6 NetRange: 2606:B400:: - 2606:B400:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation RegDate: 2010-09-20 Updated: 2012-03-02 Source: ARIN OrgID: ORACLE-4 OrgName: Oracle Corporation CanAllocate: Street: 500 Oracle Parkway Street: Attn: Domain Administrator City: Redwood Shores State/Prov: CA Country: US PostalCode: 94065 RegDate: 1988-04-29 Updated: 2017-01-28 OrgTechHandle: ORACL1-ARIN OrgAdminHandle: ORACL-ARIN OrgAbuseHandle: NISAM-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.