AS19332 Marcatel Com, S.A. de C.V.
2806:21b:201::/48 - TES11
inetnum: 2806:21b::/32 status: allocated owner: Marcatel Com, S.A. de C.V. city: Monterrey country: MX owner-c: TES11 tech-c: TES11 abuse-c: TES11 created: 2014-09-11 changed: 2014-09-11 source: LACNIC nic-hdl: TES11 person: Isaias Alegria Garcia e-mail: ialegria@MARCATEL.NET address: San Jerónimo, 210-, San Jerónimo address: 64640 - Monterrey - NL country: MX phone: +52 81 12477883  created: 20100719 changed: 20150514
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.