180.148.131.0/24

inetnum:        180.148.128.0 - 180.148.143.255
netname:        FPTONLINE-VN
descr:          FPT ONLINE JSC
descr:          6th Floor, Exchange Tower, No. 1 Nam Khoi Nghia Str, Nguyen Thai Binh Ward, District 1, Hochiminh City
country:        VN
admin-c:        NNS6-AP
tech-c:         DHS2-AP
status:         ALLOCATED PORTABLE
remarks:        send spam and abuse report to sondh@fpt.net
mnt-by:         MAINT-VN-VNNIC
mnt-irt:        IRT-VNNIC-AP
mnt-lower:      MAINT-VN-VNNIC
mnt-routes:     MAINT-VN-VNNIC
last-modified:  2017-11-12T09:02:07Z
source:         APNIC

irt:            IRT-VNNIC-AP
address:        Ha Noi, VietNam
phone:          +84-24-35564944
fax-no:         +84-24-37821462
e-mail:         hm-changed@vnnic.vn
abuse-mailbox:  hm-changed@vnnic.vn
admin-c:        NTTT1-AP
tech-c:         NTTT1-AP
auth:           # Filtered
mnt-by:         MAINT-VN-VNNIC
last-modified:  2017-11-08T09:40:06Z
source:         APNIC

person:         Dinh Hung Son
nic-hdl:        DHS2-AP
e-mail:         sondh@fpt.net
address:        FPT Online JSC
address:        408 Dien Bien Phu, Dist 10, Ho Chi Minh City
phone:          +84-8-73009999
fax-no:         +84-8-73003333
country:        vn
mnt-by:         MAINT-VN-VNNIC
last-modified:  2009-08-24T08:36:07Z
source:         APNIC

person:         Nguyen Ngoc Son
address:        FPTONLINE-VN
country:        VN
phone:          +84-983857623
e-mail:         SonNN4@fpt.com.vn
nic-hdl:        NNS6-AP
mnt-by:         MAINT-VN-VNNIC
last-modified:  2017-11-12T08:58:44Z
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.