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Network scanning tools typically use port scans to steal information from network terminals and identify vulnerabilities. In particular, Shodan and Censys use a network scanning tool to gather a wide range of terminal information, store it in their database and provide it to the users. In order to prevent such information gathering, it is required to know the scanning methods of Shodan and Censys. However, the scanning model used by Shodan and Censys is not known exactly. Therefore, this paper estimates scanning models of Shodan and Censys and analyzes the performance of each models. ※   2016 ()       (No. 2015R1A2A2A01005577) First Author : LIG Nex1 Co., Ltd., sunyoung.im@lignex1.com,  ° Corresponding Author : Department of Computer Engineering, Ajou University, bhroh@ajou.ac.kr,  * Dasan University College, Ajou University, sihnsh@ajou.ac.kr,  ** Department of Software and Computer Engineering, Ajou University, jungtae@ajou.ac.kr,  :KICS201612-393, Received December 20, 2016; Revised April 10, 2017; Accepted April 10, 2017 I.                  .             Shodan  Censys          .   Nmap, ZMap                        .     The Journal of Korean Institute of Communications and Information Sciences '17-04 Vol.42 No.04 786  1. Shodan   Fig. 1. Shodan Scan Method  TCP           ,      . Shodan Censys                 .           ,                        .            TCP             .        .            ,                     .             ,                  .               UDP , TCP SYN, TCP                ,       ,          . Shodan Censys         ,         ,      2     .        Shodan Censys         .   Shodan Censys       ,         .          ,                .      Shodan Censys            . ,       ,        .               .    . 2 Shodan Censys  , 3    . 4       , 5  .

Scan Modeling and Performance Analysis for Extensive Terminal Information Identification