The disclosed computer-implemented method for mapping Internet Protocol addresses for an organization may include (1) receiving information for an organization from an organizational server, (2) extracting data from a plurality of server data sources associated with the information, (3) mapping the data from the plurality of sever data sources to the information, and (4) determining, based at least in part on the mapped data, a list of IP addresses identifying one or more relationships associated with the organization thereby facilitating performing a security posture analysis against a malicious attack. Various other methods, systems, and computer-readable media are also disclosed.