NMAP
Nmap is short for “Network Mapper” and was originally released in September 1997 by Gordon Lyon. It has been through ten or so releases and has really matured and developed into a tool that everyone turns to when they need to scan a network for devices, services, open ports or troubleshoot network issues.
Usage
# nmap -sSV -T4 -O -p0-65535 apollo.sco.com
Starting Nmap ( https://nmap.org )
Nmap scan report for apollo.sco.com (216.250.128.35)
Not shown: 65524 closed ports
PORT STATE SERVICE VERSION
0/tcp filtered unknown
21/tcp open ftp WU-FTPD 2.1WU(1)+SCO-2.6.1+-sec
22/tcp open ssh SSH 1.2.22 (protocol 1.5)
199/tcp open smux?
457/tcp open http NCSA httpd 1.3
615/tcp open http NCSA httpd 1.5
1035/tcp filtered unknown
1521/tcp open oracle Oracle DB Listener 2.3.4.0.0 (for SCO System V/386)
13722/tcp open inetd inetd exec err /usr/openv/netbackup/bin/bpjava-msvc
13782/tcp open inetd inetd exec err /usr/openv/netbackup/bin/bpcd
13783/tcp open inetd inetd exec err /usr/openv/bin/vopied
64206/tcp open unknown
Device type: general purpose
Running: SCO UnixWare
OS details: SCO UnixWare 7.0.0 or OpenServer 5.0.4-5.0.6
Nmap done: 1 IP address (1 host up) scanned in 501.90 seconds
# nmap -sS -O -oN nmap2.log 192.168.0.19
Nmap scan report for 192.168.0.19
(The 1597 ports scanned but not shown below are in state: closed)
Port State Service
22/tcp open ssh
25/tcp open smtp
80/tcp open http
143/tcp open imap
Remote operating system guess: Sega Dreamcast
Nmap finished: 1 IP address (1 host up) scanned in 5.886 seconds
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