AS133612 Vodafone Australia Pty Ltd
2405:6e00:400::/40 - VODAFONE-AS-AP
inet6num: 2405:6e00::/32 netname: VODAFONE-AS-AP descr: Vodafone Australia Pty Ltd descr: PO Box 664 country: AU org: ORG-VAPL1-AP admin-c: SS409-AP tech-c: SS409-AP mnt-by: APNIC-HM mnt-lower: MAINT-AU-VODAFONE mnt-routes: MAINT-AU-VODAFONE mnt-irt: IRT-VODAFONE-AU remarks: for spam related issues pls contact: email@example.com remarks: for security related issues pls contact: firstname.lastname@example.org status: ALLOCATED PORTABLE last-modified: 2018-11-09T05:52:32Z geoloc: 33.8688 151.2093 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.