inetnum: 184.108.40.206 - 220.127.116.11 org: ORG-BT4-RIPE netname: UK-BTENT-970729 country: GB admin-c: BCER1-RIPE admin-c: BTCR1-RIPE tech-c: BTCR3-RIPE status: ALLOCATED PA mnt-by: RIPE-NCC-HM-MNT mnt-by: BTENT-MNT mnt-routes: BTNET-MNT created: 2002-06-13T11,46,30Z last-modified: 2016-09-13T15,24,22Z source: RIPE organisation: ORG-BT4-RIPE org-name: British Telecommunications PLC org-type: LIR address: 1st Floor, York Tel Exch, The Stonebow address: YO1 7NT address: York address: UNITED KINGDOM phone: +44 1904 657184 fax-no: +44 1904 657225 e-mail: email@example.com admin-c: BTCR1-RIPE admin-c: SAM62-RIPE admin-c: SW4727-RIPE admin-c: LBH1-RIPE mnt-ref: BTENT-MNT mnt-ref: RIPE-NCC-HM-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: BTENT-MNT abuse-c: BTCR3-RIPE created: 2004-04-17T12,11,54Z last-modified: 2016-09-13T15,24,56Z source: RIPE role: BT Corporate Registry address: British Telecommunications address: 81 Newgate Street address: London GB e-mail: firstname.lastname@example.org admin-c: BCER1-RIPE admin-c: SAM62-RIPE admin-c: SW4727-RIPE tech-c: BCER1-RIPE tech-c: SAM62-RIPE nic-hdl: BTCR1-RIPE abuse-mailbox: email@example.com mnt-by: BTENT-MNT created: 2002-03-22T09,16,45Z last-modified: 2014-06-24T12,09,51Z source: RIPE role: BT Corporate Registry address: British Telecommunications address: 81 Newgate Street address: London GB e-mail: firstname.lastname@example.org e-mail: email@example.com e-mail: firstname.lastname@example.org remarks: central contact point for BT Corporate data networks admin-c: BCER1-RIPE admin-c: SAM62-RIPE admin-c: LBH1-RIPE admin-c: SW4727-RIPE tech-c: BCER1-RIPE nic-hdl: BTCR3-RIPE abuse-mailbox: email@example.com mnt-by: BTENT-MNT created: 2002-03-22T09,22,53Z last-modified: 2013-03-28T10,21,53Z source: RIPE person: BT Computer Emergency Response Team address: PP L16 address: Pheonix House address: 202 Elder Gate address: Milton Keynes address: Buckinghamshire address: MK9 1BE phone: +44 1908 609 271 fax-no: +44 1908 230 343 e-mail: firstname.lastname@example.org nic-hdl: BCER1-RIPE remarks: BT Security Computer Emergency Response Team mnt-by: BTENT-MNT created: 2001-11-08T10,50,29Z last-modified: 2013-03-28T12,32,05Z source: RIPE route: 18.104.22.168/19 descr: British Telecom origin: AS2856 mnt-by: BTNET-MNT created: 2012-04-26T15,02,49Z last-modified: 2012-04-26T15,02,49Z 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.