noun-modifying (irregular)
reverse lookup
Used for looking up something by a non-standard key, such as finding a word from its definition, resolving an address to a name, or searching a dictionary backwards.
この辞書には逆引き機能がついている。
This dictionary has a reverse lookup function.
IPアドレスからドメイン名を逆引きする。
Perform a reverse lookup of the domain name from the IP address.
Compound of 逆 (reverse) and 引き (pulling, lookup), from the verb 引く (to pull, to look up).