Jisho

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Noun or verb acting prenominally
1. reverse lookup (e.g. dictionary, address resolution, etc.)
Wikipedia definition
2. Reverse DNS lookupIn computer networking, reverse DNS lookup or reverse DNS resolution (rDNS) is the determination of a domain name that is associated with a given IP address using the Domain Name Service (DNS) of the Internet. Computer networks use the Domain Name System to determine the IP address associated with a domain name. This process is also known as forward DNS resolution. Reverse DNS lookup is the inverse process, the resolution of an IP address to its designated domain name.
Read “Reverse DNS lookup” on English Wikipedia
Read “逆引き” on Japanese Wikipedia
Read “Reverse DNS lookup” on DBpedia
Other forms
逆引 【ぎゃくびき】

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