192.200.64.0/20

inetnum:        192.200.64.0 - 192.200.79.255
netname:        NETBLK-LION-NATHAN2
descr:          imported inetnum object for NZWSL
country:        NZ
admin-c:        NZWS1-AP
tech-c:         NZWS1-AP
status:         ALLOCATED PORTABLE
remarks:        ----------
remarks:        imported from ARIN object:
remarks:
remarks:        inetnum:     192.200.64.0 - 192.200.79.255
remarks:        netname:     NETBLK-LION-NATHAN2
remarks:        org-id:      NZWSL
remarks:        status:      assignment
remarks:        tech-c:      JD3025-ARIN
remarks:        reg-date:    1992-08-06
remarks:        changed:     hostmaster@arin.net 19981012
remarks:        source:      ARIN
remarks:
remarks:        ----------
notify:         helpdesk@apnic.net
mnt-by:         APNIC-HM
last-modified:  2012-02-17T00:31:46Z
source:         APNIC


person:         New Zealand Wines  Spirits Ltd. Maintainer For ERX Transfers
address:        Cnr. Springs & East Tamari Rds, East Tamaki P.O. Box 58741 Greenmount, Auckland
country:        NZ
phone:          +00 00 0000 0000
e-mail:         no-email-erx@apnic.net
nic-hdl:        NZWS1-AP
remarks:        ----------
remarks:        
remarks:        This record made from details in ARIN org: [NZWSL].
remarks:        Because no poc-contact was listed at ARIN.
remarks:        
remarks:        ----------
notify:         no-email-erx@apnic.net
mnt-by:         MNT-ERX-NEWZEALAWINESSPIRI-NON-NZ
last-modified:  2008-09-04T07:33:08Z
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.