AS17477 Macquarie Telecom
2405:d300:800::/40 - DOIISRATE-20121127
inet6num: 2405:d300::/32 netname: DOIISRATE-20121127 descr: Department of Industry, Innovation, Science, Research and Tertiary Education country: AU org: ORG-DOII1-AP admin-c: DOII1-AP tech-c: DOII1-AP mnt-lower: MAINT-DOIISRATE-AU mnt-routes: MAINT-DOIISRATE-AU mnt-irt: IRT-DOIISRATE-AU mnt-by: APNIC-HM status: ALLOCATED PORTABLE remarks: -+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+-+-+-+-+-+-+-+-+-+ remarks: This object can only be updated by APNIC hostmasters. remarks: To update this object, please contact APNIC remarks: hostmasters and include your organization's account remarks: name in the subject line. remarks: -+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+-+-+-+-+-+-+-+-+-+ last-modified: 2017-08-29T23:03:05Z source: APNIC role: Department of Industry Innovation Science Resea address: Postal address:, GPO Box 9839, CANBERRA ACT 2601, Canberra ACT 2601 country: AU phone: +61 2 6213 6000 fax-no: +61 2 6213 6000 e-mail: email@example.com admin-c: DOII1-AP tech-c: DOII1-AP nic-hdl: DOII1-AP mnt-by: MAINT-DOIISRATE-AU last-modified: 2012-11-27T01:32:21Z source: APNIC irt: IRT-DOIISRATE-AU address: Postal address:, GPO Box 9839, CANBERRA ACT 2601, Canberra ACT 2601 e-mail: Mitchell.Lewis@industry.gov.au abuse-mailbox: Mitchell.Lewis@industry.gov.au admin-c: DOII1-AP tech-c: DOII1-AP auth: # Filtered mnt-by: MAINT-DOIISRATE-AU last-modified: 2019-06-05T01:46:58Z source: APNIC
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.