AS14244 NSI Hosting
2605:9500:4::/48 - NSI001001
V6NetHandle: NET6-2605-9500-1 OrgID: NETWO-323 Parent: NET6-2600-1 NetName: NSI001001 NetRange: 2605:9500:: - 2605:9500:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 53632 RegDate: 2011-08-02 Updated: 2012-03-02 Source: ARIN OrgID: NETWO-323 OrgName: Datatility, Inc. CanAllocate: Street: 21715 Filigree Ct. City: Ashburn State/Prov: VA Country: US PostalCode: 20147 RegDate: 2010-04-21 Updated: 2017-01-28 OrgAbuseHandle: NOC11427-ARIN OrgTechHandle: NOC11427-ARIN OrgNOCHandle: NOC11427-ARIN OrgAdminHandle: NOC11427-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.