2001:4:112::/48 - IANA-V6-RESERVE
V6NetHandle: NET6-2001-1 OrgID: IANA Parent: NetName: IANA-V6-RESERVE NetRange: 2001:: - 2001:1FF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: reserved Comment: The assignable Global Unicast Address space is defined Comment: in [RFC4291] as being the address block defined by the Comment: prefix 2000::/3. All address space in this block not listed Comment: on the IANA IPv6 Global Unicast Address Assignments page Comment: at http://iana.org/assignments/ipv6-unicast-address-assignments Comment: is reserved by IANA for future allocation. RegDate: 1999-07-01 Updated: 2008-11-14 Source: ARIN OrgID: IANA OrgName: Internet Assigned Numbers Authority CanAllocate: Street: 12025 Waterfront Drive Street: Suite 300 City: Los Angeles State/Prov: CA Country: US PostalCode: 90292 RegDate: 1970-01-01 Updated: 2012-08-31 OrgAbuseHandle: IANA-IP-ARIN OrgAdminHandle: IANA-ARIN OrgTechHandle: IANA-IP-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.