PTR can refer to: Particle transfer roller, for cleaning motion picture film. PetroChina (NYSE: PTR). Photothermal Ratio, light/temperature ratio for a plant. Physikalisch-Technische Reichsanstalt, later Physikalisch-Technische Bundesanstalt, a German research institute. Pitrilysin, an enzyme.

PTR records enable reverse DNS: The domain name is determined based on an IP address. How does this work? We explain the PTR record lookup.

PTR weapons are engineered in adherence to the classic German/Spanish roller delay blow-back system, with a modern, Made in America, twist to precision machining, material and feature selection.

PTR records are used for the Reverse DNS (Domain Name System) lookup. In the Reverse DNS zone, you need to use a PTR Record. The PTR Record resolves the IP address to a domain/hostname.

A PTR record is well-known as the reverse version of an A record . While A record maps the domain Perform the methods below to see your domain's PTR record value and make sure that you've set a...