AS15572 Verizon UK Limited
2600:803:1200::/48 - TBD
V6NetHandle: NET6-2600-803-1200-1 OrgID: BALTIM-8 Parent: NET6-2600-800-1 NetName: TBD NetRange: 2600:803:1200:: - 2600:803:1200:FFFF:FFFF:FFFF:FFFF:FFFF NetType: reassignment Comment: Addresses within this block are non-portable. RegDate: 2014-03-11 Updated: 2014-03-11 Source: ARIN OrgID: BALTIM-8 OrgName: Baltimore Technologies CanAllocate: Street: 77 A Street City: Needham State/Prov: MA Country: US PostalCode: 02494 RegDate: 2001-07-11 Updated: 2011-09-24 OrgTechHandle: SNE2-ARIN OrgAdminHandle: SNE2-ARIN OrgAbuseHandle: SNE2-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.