AS15248 Metaswitch Networks Corp.
2620:104:4000::/47 - METASWITCH-V6
V6NetHandle: NET6-2620-104-4000-1 OrgID: DCC-138 Parent: NET6-2620-1 NetName: METASWITCH-V6 NetRange: 2620:104:4000:: - 2620:104:400F:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment OriginAS: 15248 RegDate: 2011-05-26 Updated: 2012-03-02 TechHandle: AMO106-ARIN Source: ARIN OrgID: DCC-138 OrgName: Metaswitch Networks Corp. CanAllocate: Street: 11600 Sunrise Valley Drive Street: Suite 250 City: Reston State/Prov: VA Country: US PostalCode: 20191 RegDate: 2011-04-12 Updated: 2017-08-03 OrgTechHandle: AMO106-ARIN OrgAdminHandle: AMO106-ARIN OrgAbuseHandle: AMO106-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.