AS17974 PT Telekomunikasi Indonesia
2001:4488:5100::/48 - TLKM_BB_BROADBAND_CUST_NAS
inet6num: 2001:4488:5000::/36 netname: TLKM_BB_BROADBAND_CUST_NAS descr: PT TELKOM INDONESIA country: ID admin-c: AZ163-AP tech-c: FS370-AP status: ASSIGNED NON-PORTABLE remarks: These IP was used for PT TELKOM Indonesia's infrastructure mnt-by: MAINT-TELKOMNET mnt-lower: MAINT-TELKOMNET mnt-routes: MAINT-TELKOMNET mnt-irt: IRT-IDTELKOM-ID last-modified: 2011-03-09T04:53:50Z source: APNIC person: Febrian Setiadi address: GSD Lt 14 Jl. Kebon Sirih No.12 country: ID phone: +62-21-3860500 e-mail: email@example.com nic-hdl: FS370-AP mnt-by: MAINT-TELKOMNET last-modified: 2010-12-20T01:30:54Z source: APNIC irt: IRT-IDTELKOM-ID address: PT. TELKOM INDONESIA address: STO Telkom Gambir 3th Floor address: Medan Merdeka Selatan address: JAKARTA e-mail: firstname.lastname@example.org abuse-mailbox: email@example.com admin-c: DF99-AP tech-c: AR165-AP auth: # Filtered mnt-by: MAINT-TELKOMNET last-modified: 2015-10-15T05:58:44Z source: APNIC person: Akhmad Zaimi address: GSD Lt.14 Jl. Kebon Sirih No.12 country: ID phone: +62-21-3860500 e-mail: firstname.lastname@example.org nic-hdl: AZ163-AP mnt-by: MAINT-TELKOMNET last-modified: 2010-12-20T01:33:46Z 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.