AS3491 PCCW Global, Inc.
220.127.116.11/21 - SFMHK
NetHandle: NET-205-177-224-0-1 OrgID: C02600475 Parent: NET-205-177-0-0-1 NetName: SFMHK NetRange: 18.104.22.168 - 22.214.171.124 NetType: reassignment OriginAS: 25938 RegDate: 2010-10-06 Updated: 2010-10-06 Source: ARIN OrgID: C02600475 OrgName: SFM HK Management Limited CanAllocate: Street: 35/F, Suites 3508-3512 Street: Two International Finance Centre City: Central State/Prov: NIL Country: HK PostalCode: nil RegDate: 2010-10-06 Updated: 2011-03-19 Source: ARIN
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.