2a09:bac0:157::/48

inet6num:       2a09:bac0::/32
netname:        CLOUDFLAREWARP
country:        US
notify:         rir@cloudflare.com
admin-c:        CAC80-RIPE
tech-c:         CTC6-RIPE
status:         ALLOCATED-BY-LIR
mnt-by:         MNT-CLOUDFLARE
created:        2019-03-14T22:39:38Z
last-modified:  2019-03-19T21:12:40Z
source:         RIPE

person:         Cloudflare Abuse Contact
address:        101 Townsend Street, San Francisco, CA 94107, US
phone:          +1 (650) 319-8930
e-mail:         abuse@cloudflare.com
notify:         rir@cloudflare.com
remarks:        All Cloudflare abuse reporting can be done via https://www.cloudflare.com/abuse
nic-hdl:        CAC80-RIPE
mnt-by:         MNT-CLOUDFLARE
created:        2012-06-01T23:27:49Z
last-modified:  2018-06-10T10:14:26Z
source:         RIPE

person:         Cloudflare Technical Contact
address:        101 Townsend Street, San Francisco, CA 94107, US
phone:          +1 (650) 319-8930
notify:         rir@cloudflare.com
nic-hdl:        CTC6-RIPE
mnt-by:         MNT-CLOUDFLARE
created:        2012-06-01T23:35:57Z
last-modified:  2018-06-10T10:16:13Z
source:         RIPE

route6:         2a09:bac0::/32
origin:         AS13335
remarks:        https://cloudflare.com/abuse
mnt-by:         MNT-CLOUDFLARE
created:        2019-03-20T00:14:53Z
last-modified:  2019-03-20T00:14:53Z
source:         RIPE

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.