Request routing based on class

A system comprising:

• a first network point of presence associated with a content delivery network service, wherein the first network point of presence includes a first Domain Name System (DNS) server that receives a DNS query from a client computing device, wherein the DNS query corresponds to a requested resource associated with a first resource identifier, wherein the content delivery network service includes one or more cache servers to provide the requested resource, and wherein the first DNS server in the first network point of presence is operable to:
• determine a class of the client computing device associated with the DNS query;
• and
• determine routing information based on the class of the client computing device.

A system comprising:

• a first network point of presence associated with a content delivery network service, wherein the first network point of presence includes a Domain Name System (DNS) server component that receives a DNS query from a client computing device, wherein the DNS query corresponds to a requested resource associated with a first resource identifier, wherein the content delivery network service includes one or more cache servers to provide the requested resource, and wherein the DNS server component in the first network point of presence is operable to:
• associate the client computing device with a cluster of other client computing devices;
• determine an alternative resource identifier for use in providing the requested resource based on routing information for the cluster;
• and
• cause transmission of the alternative resource identifier to the client computing device, wherein the alternative resource identifier includes information for causing a DNS query to resolve to a domain corresponding to the content delivery service.

A method comprising:

• under control of one or more configured computing systems of a content delivery network service:
• obtaining a Domain Name System (DNS) query from a client computing device at a first DNS server, wherein the DNS query corresponds to a requested resource and wherein the first DNS server corresponds to the content delivery network service, the content delivery network service having one or more cache servers to provide the requested resource;
• associating the client computing device with a cluster of other client computing devices;
• determining an alternative resource identifier for use in providing the requested resource based on routing information for the cluster;
• and
• causing transmission of the alternative resource identifier to the client computing device, wherein the alternative resource identifier includes information for causing a DNS query to resolve to a domain corresponding to the content delivery service.