inetnum: 184.108.40.206 - 220.127.116.11 netname: NOMINET-VOIP descr: Nominet UK country: GB admin-c: NMUK-RIPE tech-c: NMUK-RIPE status: ASSIGNED PA mnt-by: NOMUK-RIPE-MNT mnt-lower: NOMUK-RIPE-MNT mnt-routes: NOMUK-RIPE-MNT created: 2005-04-20T09:43:47Z last-modified: 2005-04-20T09:43:47Z source: RIPE role: Nominet UK Admin address: Nominet UK address: Minerva House address: Edmund Halley Road address: Oxford Science Park address: Oxford address: OX4 4DQ address: United Kingdom phone: +44 1865 332211 fax-no: +44 1865 332299 e-mail: firstname.lastname@example.org admin-c: DS3704-RIPE tech-c: DS3704-RIPE nic-hdl: NMUK-RIPE notify: email@example.com abuse-mailbox: firstname.lastname@example.org mnt-by: NOMUK-RIPE-MNT created: 1970-01-01T00:00:00Z last-modified: 2013-05-14T16:13:20Z source: RIPE route: 18.104.22.168/19 descr: Nominet origin: AS8683 mnt-by: NOMUK-RIPE-MNT mnt-routes: NOMUK-RIPE-MNT mnt-lower: NOMUK-RIPE-MNT notify: email@example.com created: 2003-11-18T16:38:20Z last-modified: 2003-11-19T01:13:27Z source: RIPE
IP address subranges within this IP range
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.