185.100.174.0/24

inetnum:        185.100.172.0 - 185.100.175.255
netname:        UK-STREAM-20150518
country:        GB
org:            ORG-STL64-RIPE
admin-c:        SR12381-RIPE
tech-c:         SR12381-RIPE
status:         ALLOCATED PA
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         uk-stream-1-mnt
mnt-lower:      uk-stream-1-mnt
mnt-routes:     uk-stream-1-mnt
created:        2015-05-18T12:28:20Z
last-modified:  2016-11-29T16:15:34Z
source:         RIPE
abuse-email:    hostmaster@arm.com
abuse-c:        AR32130-RIPE
abuse-org:      ORG-STL64-RIPE

organisation:   ORG-STL64-RIPE
org-name:       Arm Cloud Services Limited
org-type:       LIR
address:        St Vincent Plaza 319 St Vincent Street
address:        G2 5LD
address:        Glasgow
address:        UNITED KINGDOM
phone:          +44 7843 670 704
e-mail:         pcm-tech@arm.com
admin-c:        SR12381-RIPE
tech-c:         SR12381-RIPE
abuse-c:        AR32130-RIPE
mnt-ref:        uk-stream-1-mnt
mnt-ref:        RIPE-NCC-HM-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         uk-stream-1-mnt
created:        2015-05-12T07:21:15Z
last-modified:  2020-03-19T13:30:22Z
source:         RIPE

role:           Stream Role
address:        Arm Cloud Services Limited
address:        St Vincent Plaza
address:        319 St Vincent Street
address:        Glasgow
address:        G2 5LD
e-mail:         pcm-tech@arm.com
nic-hdl:        SR12381-RIPE
admin-c:        SP15639-RIPE
admin-c:        SE4500-RIPE
admin-c:        JM20979-RIPE
tech-c:         SP15639-RIPE
tech-c:         SE4500-RIPE
tech-c:         JM20979-RIPE
mnt-by:         uk-stream-1-mnt
created:        2016-11-29T16:06:26Z
last-modified:  2020-05-12T10:57:27Z
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.