AS11488 BBN Technologies Corp.
2620:3b::/48 - BBN-TECH-IPV6
V6NetHandle: NET6-2620-3B-1 OrgID: BTC-58 Parent: NET6-2620-1 NetName: BBN-TECH-IPV6 NetRange: 2620:3B:: - 2620:3B:0:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment OriginAS: 11488 RegDate: 2011-01-20 Updated: 2012-03-02 Source: ARIN OrgID: BTC-58 OrgName: BBN Technologies Corp. CanAllocate: Street: 10 Moulton St City: Cambridge State/Prov: MA Country: US PostalCode: 02138 RegDate: 2007-05-15 Updated: 2018-05-01 OrgAbuseHandle: MOSES27-ARIN OrgTechHandle: MOSES27-ARIN OrgAdminHandle: GILLE168-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.