Below are some of the sites that I frequent. I reccomend these sites to anyone.

IANA (Internet Assigned Numbers Authority): This is pretty much one of the flagship websites of the internet. This organization takes care of describing how IP addresses are assigned on the internet, and also takes care of maintaining a database of ports used by programs. IANA serves as a bookkeeper in recording the assignments that are made. In Internet terminology, the record-keeping service IANA performs is called a registration service, and IANA serves as a registry.

ICANN (The Internet Corporation for Assigned Names and Numbers): ICANN is an internationally organized, non-profit corporation that has responsibility for Internet Protocol (IP) address space allocation, protocol identifier assignment, generic (gTLD) and country code (ccTLD) Top-Level Domain name system management, and root server system management functions. These services were originally performed under U.S. Government contract by the Internet Assigned Numbers Authority (IANA) and other entities. ICANN now performs the IANA function. ICANN is responsible for coordinating the management of the technical elements of the DNS to ensure universal resolvability so that all users of the Internet can find all valid addresses. It does this by overseeing the distribution of unique technical identifiers used in the Internet's operations, and delegation of Top-Level Domain names (such as .com, .info, etc.).