.ph is the Internet country code top-level domain (ccTLD) for the Philippines.
The official domain registry of the .ph domain is dotPH Domains Inc. dotPH holds and maintains the database of PH domain names, specifically .ph, .com.ph, .net.ph, and .org.ph. Its domain name registrars are not only individuals, businesses, and organizations in the Philippines, but also those in other parts of the world.
None in general; some specific subdomains may have restrictions; domain names are written in basic Latin alphabet without diacritics only.