AS33503 Medical College of Wisconsin
V6NetHandle: NET6-2620-10D-1 OrgID: MCW-1 Parent: NET6-2620-1 NetName: MCW-IPV6 NetRange: 2620:10D:: - 2620:10D:F:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment OriginAS: 33503 RegDate: 2012-05-21 Updated: 2012-05-21 Source: ARIN OrgID: MCW-1 OrgName: Medical College of Wisconsin CanAllocate: Street: MIS Department - Information Services 8701 Watertown Plank Road City: Milwaukee State/Prov: WI Country: US PostalCode: 53226 RegDate: 1990-07-10 Updated: 2011-09-24 OrgAbuseHandle: MH4-ORG-ARIN OrgAdminHandle: MH4-ORG-ARIN OrgTechHandle: MH4-ORG-ARIN Source: ARIN POCHandle: MH4-ORG-ARIN IsRole: Y LastName: Medical College of Wisconsin Information Services FirstName: Street: 8701 Watertown Plank Road City: Milwaukee State/Prov: WI Country: US PostalCode: 53226 RegDate: 1999-03-17 Updated: 2021-01-26 FaxPhone: +1-414-955-0105 OfficePhone: +1-414-955-4357 Mailbox: email@example.com Source: ARIN
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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.