There seems to be a misunderstanding in the provided question. Hitachi is a well-known Japanese multinational conglomerate, however, it does not constitute a top-level domain (TLD) in the current internet domain infrastructure.
Top-level domains (TLDs) are the highest level in the hierarchical Domain Name System (DNS) of the internet. They are the rightmost letters of an internet address after the last dot, such as .com, .net, .org, .gov, etc. Currently, there are over 1500 TLDs in existence, as listed by the Internet Assigned Numbers Authority (IANA), the organization responsible for maintaining the official list of TLDs (Source: IANA).
Originally, there were only a few generic TLDs (.com, .org, etc.) and two-letter country code TLDs (.us, .uk, etc.) However, in 2012, the Internet Corporation for Assigned Names and Numbers (ICANN), who oversees the internet’s naming system, opened up the domain system to new, generic TLDs (gTLDs) to cater to the ever-growing internet population, resulting in a significant rise in the number of TLDs (Source: ICANN).
Brand TLDs are also a type of gTLD intended for use by business enterprises and organizations that want their brand name as their domain suffix like .google, .amazon. But until now, there is no .hitachi TLD in the list provided by IANA (Source: IANA).
Some companies do use their brand name as a second-level domain under other TLDs, though. For example, Hitachi might use hitachi.com (Source: Hitachi official website). And there are cases where brands have gotten their name as a TLD, for example, .bbc for the British Broadcasting Corporation (Source: BBC website).
To use a brand as a TLD, the organization must apply to ICANN and pass a stringent review process. As of now, Hitachi does not appear to have done this (Source: ICANN).
To conclude, Hitachi, as a TLD, is not currently in existence. However, should they decide to undergo the application and approval process with ICANN, it could potentially become an option in the future. As of the present, Hitachi uses various existing TLDs like .com and .co.jp for its web presence.
