inetnum: 184.108.40.206 - 220.127.116.11 netname: JPNIC-NET-JP-ERX descr: Japan Network Information Center country: JP admin-c: JNIC1-AP tech-c: JNIC1-AP remarks: 133/8 block is an ERX range which transfered from remarks: ARIN to APNIC on 2009-10-30 remarks: The original allocation date was 1997-03-01 remarks: Please search whois.nic.ad.jp for more information remarks: about this range remarks: % whois -h whois.nic.ad.jp ***.***.***.***/e mnt-by: MAINT-JPNIC mnt-lower: MAINT-JPNIC status: ALLOCATED PORTABLE last-modified: 2009-10-30T00:51:09Z source: APNIC
IP address subranges within this IP range
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.