AS174 Cogent Communications
2001:49f0:a01e::/48 - FDCSERVERS
V6NetHandle: NET6-2001-49F0-1 OrgID: FDCSE Parent: NET6-2001-4800-0 NetName: FDCSERVERS NetRange: 2001:49F0:: - 2001:49F0:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 30058, 174 RegDate: 2005-12-02 Updated: 2018-10-12 Source: ARIN OrgID: FDCSE OrgName: FDCservers.net CanAllocate: Street: 141 W Jackson Blvd. #1135 City: Chicago State/Prov: IL Country: US PostalCode: 60604 RegDate: 2003-05-20 Updated: 2017-01-28 ReferralServer: rwhois://rwhois.fdcservers.net:4321 OrgTechHandle: ABUSE438-ARIN OrgNOCHandle: ABUSE438-ARIN OrgAdminHandle: ABUSE438-ARIN OrgAbuseHandle: ABUSE438-ARIN Source: ARIN POCHandle: ABUSE438-ARIN IsRole: Y LastName: ABUSE department FirstName: Street: 141 W Jackson Blvd. #1135 City: Chicago State/Prov: IL Country: US PostalCode: 60604 RegDate: 2003-10-22 Updated: 2019-05-23 OfficePhone: +1-312-423-6675 Mailbox: firstname.lastname@example.org Source: ARIN
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.