TLD (Top Level Domain)

In the Internet Domain Name System (DNS), the rightmost portion of

the address, the TLD identifies the type of entity owning or sponsoring the address, or the country in which the address is located. The several types of Top Level Domains (TLDs) include generic Top Level Domains (gTLDs) and country codes (ccTLDs). The gTLD is always used. If a country code is also used in the address, it becomes the TLD, and the gTLD becomes the secondary domain. See also ccTLD, DNS, domain, gTLD, Internet, and secondary domain.

• offset quadrature phase shift keying (OQPSK)
• offshoring
• OFN (Optical Fiber, Nonconductive)
• OFNP (Optical Fiber, Nonconductive, Plenum)
• OFNR (Optical Fiber, Nonconductive, Riser)
• OH
• Ohm, Georg Simon (1787–1854)
• Ohm’s Law
• Ohm’s Law
• OLT (Optical Line Terminal)
• OLT (Optical Line Terminal)
• Omnibus Budget Reconciliation Act of 1993 (OBRA 93)
• OMR (Optical Mark Recognition)
• ones density
• on-hook
• ONT (Optical Network Terminal)
• ONU (Optical Network Unit)
• OOO (Optical-Optical-Optical)
• opaque OXC (opaque Optical CROSS-Connect)
• open circuit
• open-loop algorithm
• Open Shortest Path First (OSPF)
• open source
• open source software (OSS)
• open standard