AS18402 NATIONAL LIBRARY BOARD
2001:df0:301::/48 - IDA-NLB
inet6num: 2001:df0:301::/48 netname: IDA-NLB descr: GOVERNMENT TECHNOLOGY AGENCY descr: 10 Pasir Panjang Road descr: #10-00 Mapletree Business City country: SG org: ORG-GTA1-AP admin-c: GTAA1-AP tech-c: GTAA1-AP mnt-by: APNIC-HM mnt-lower: MAINT-GOVTECH-SG mnt-routes: MAINT-GOVTECH-SG mnt-irt: IRT-GOVTECH-SG status: ASSIGNED PORTABLE last-modified: 2017-11-20T05:18:25Z source: APNIC irt: IRT-GOVTECH-SG address: 10 Pasir Panjang Road, #10-00, Mapletree Business City, Singapore Singapore 117438 e-mail: Samuel_Wong@tech.gov.sg abuse-mailbox: Samuel_Wong@tech.gov.sg admin-c: GTAA1-AP tech-c: GTAA1-AP auth: # Filtered mnt-by: MAINT-GOVTECH-SG last-modified: 2017-10-30T04:32:08Z source: APNIC role: GOVERNMENT TECHNOLOGY AGENCY administrator address: 10 Pasir Panjang Road, #10-00, Mapletree Business City, Singapore Singapore 117438 country: SG phone: +6562110888 fax-no: +6562110888 e-mail: Samuel_Wong@tech.gov.sg admin-c: GTAA1-AP tech-c: GTAA1-AP nic-hdl: GTAA1-AP mnt-by: MAINT-GOVTECH-SG last-modified: 2017-10-30T04:32:08Z 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.