DNS (Domain Name Service) resolves names that are used by applications (like web or email) to their IP address. Brown maintains DNS names and their corresponding addresses for any name ending in .brown.edu. This service also provides a corresponding reverse lookup function to map IP addresses back to their respective names. Brown maintains the reverse lookup for it's public IP addresses starting with 128.148 and 138.16 as well as many private IP addresses local to the campus network.