One of the key bodies overseeing Internet networking. IANA governs top-level domains—represented by the final part of Web domain names, such as .com, .org, or .edu. It also governs IP address allocation and TCP and UDP port number assignment. About, Inc. 2004. IANA. [Online, 2004.] About, Inc. Website. http:// compnetworking.about.com/library/glossary/bldef-iana.htm.