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.ac is the Internet country code top-level domain (ccTLD) for Ascension Island. It is administered by NIC.AC, a subsidiary of the Internet Computer Bureau based in the United Kingdom. Registration for this domain is open to anyone. The registry accepts registrations of internationalized domain names.[1] .ac is marketed by some domain-brokers as a domain for the city of Aachen in Germany, using the analogy to the automotive license plate designation ("AC") for the city. Use as an abbreviation for "academic" Due to its similarity to the .ac ( academic ) second-level domain that exists under some country code top-level domains, some educational institutions also register under the .ac top-level domain: Second-level subdomains There are five second-level domains: - com.ac: Commercial Entities
- net.ac: Network Service Providers
- gov.ac: Government
- org.ac: Non-commercial Organizations
- mil.ac: Military
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