18.104.22.168/20 - NVT
inetnum: 181.176/16 status: allocated aut-num: N/A owner: VIETTEL PERÚ S.A.C. ownerid: PE-VPSA9-LACNIC responsible: Tran Ngoc Thieu address: Calle Bernini, 279, address: LIMA41 - Lima - country: PE phone: +51 1 5921607  owner-c: NVT tech-c: NVT abuse-c: NVT inetrev: 181.176/16 nserver: DNS1.VIETTELPERU.COM.PE [lame - not published] nsstat: 20170822 TIMEOUT nslastaa: 20150829 nserver: PDNS1.VIETTELPERU.COM.PE nsstat: 20170822 AA nslastaa: 20170822 nserver: PDNS2.VIETTELPERU.COM.PE nsstat: 20170822 AA nslastaa: 20170822 created: 20120111 changed: 20120111 nic-hdl: NVT person: Dennis Laime Cahuapaza e-mail: dennis.laime@BITEL.COM.PE address: Calle 21 Urb.Corpac - San Isidro, 878, address: LIMA27 - Lima - country: PE phone: +51 930800080  created: 20111121 changed: 20160129
IP address subranges within this IP range
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.