2405:7c00:2000::/36 - CNXNET
inet6num: 2405:7c00::/32 netname: CNXNET descr: Wireless Broadband Service Provider, Malaysia country: MY org: ORG-RMSB1-AP admin-c: CTCY1-AP tech-c: ZHE2-AP mnt-lower: MAINT-MY-CNX mnt-routes: MAINT-MY-CNX mnt-by: APNIC-HM status: ALLOCATED PORTABLE mnt-irt: IRT-CNX-MY last-modified: 2017-10-05T12:58:50Z source: APNIC person: Canny Thang Chong You address: C-5-1, Mines Waterfront Business Park, No.3, Jalan Tasik, address: 43300, Seri Kembangan, Selangor address: Malaysia country: MY phone: +60-3-89413843 fax-no: +60-3-89419633 e-mail: email@example.com nic-hdl: CTCY1-AP remarks: spam send to firstname.lastname@example.org mnt-by: MAINT-MY-EBUILDING last-modified: 2008-09-04T07:29:39Z source: APNIC person: Zow Hua Ern address: Suite 22-28, IOI Business Park address: 47600, Puchong, Selangor address: Malaysia country: MY phone: +60-3-80732288 fax-no: +60-3-80732223 e-mail: email@example.com nic-hdl: ZHE2-AP remarks: For SPAM/ABUSE Issue: firstname.lastname@example.org remarks: For Network Related Issue: email@example.com abuse-mailbox: firstname.lastname@example.org mnt-by: MAINT-MY-EBUILDING last-modified: 2010-10-07T12:07:12Z source: APNIC irt: IRT-CNX-MY address: Suite 22-28, 5th floor, address: IOI Business Park, address: 47100 Puchong, address: Selangor, Malaysia. e-mail: email@example.com abuse-mailbox: firstname.lastname@example.org admin-c: CN186-AP tech-c: CN186-AP auth: # Filtered mnt-by: MAINT-MY-CNX last-modified: 2010-11-11T07:38:18Z 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.