Overview of services running on Port 1521 TCP.
~78 Thousand IP addresses observed from May to December 2012
To get raw lists of the data go to Download. For an explanation of what this data is and how it was obtained, see Paper.

Servicename Product Count Percent
oracle-tnsOracle TNS Listener6981689.454
ircDancer ircd34394.406
chatAIM or ICQ server13761.763
no match-/-10341.325
httpWangWnagSimpleServer4410.565
http3900.5
httplighttpd3220.413
httpMicrosoft IIS httpd1690.217
sshOpenSSH1580.202
httpMicrosoft HTTPAPI httpd1070.137
ssh680.087
ftpMicrosoft ftpd470.06
vncVNC390.05
ftp380.049
arcserveARCserve Discovery380.049
telnet350.045
socks4Connection ok350.045
httpBoa HTTPd320.041
mysqlMySQL300.038
nntpINN nntpd220.028
oracle-mtsOracle MTS Recovery Service210.027
httpnginx210.027
oracleOracle Database200.026
ftpFileZilla ftpd180.023
sslTLS170.022
ftpvsftpd160.021
ftpProFTPD160.021
netbios-ssn130.017
remotingMS .NET Remoting services120.015
smtp110.014
ftpServ-U ftpd100.013
ftpDreambox ftpd100.013