Network Information Center (NIC)

.ad

The .ad domain name extension is a ccTLD (country code top-level domain) for Andorra. Registration of .ad domain names is popular in Andorra and it is also used as a domain hack by ad agencies/advertising companies, playing on the abbreviation of ad for advertisement/advert. There are restrictions for registering an .ad domain name. You must either have a trademark registration in Andorra (Wordmark in class 42) or citizenship to register .ad domains.

.ac

The .ac domain name extension is a ccTLD (country code top-level domain) for Ascension Island. This domain extension is often registered by entities located in Ascension Island, but it is also used for academic websites, such as universities and as a domain hack. There are no restrictions as to who can register top level .ac domain names. However, some restrictions apply for second and third level .ac domains.
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