1. A computer-implemented method comprising: obtaining a first domain name system (DNS) query from a client computing device at a first DNS server, wherein the first DNS query is associated with a first requested resource and wherein the first DNS server is associated with a content delivery network service; obtaining a query internet protocol (IP) address associated with the first DNS query at the first DNS server, wherein the query IP address is associated with the client computing device; obtaining, at the first DNS server from a data store, an identifier from a plurality of identifiers based, at least in part, on a portion of the obtained query IP address, wherein the data store includes at least one partial IP address to identifier mapping, and wherein the data store further includes network points of presence mappings to at least one of the plurality of identifiers; and resolving the first DNS query based on the identifier.