Nmap (“Network Mapper”) is a utility for network discovery and security auditing. It is useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime.<\/p>\n
Using Nmap you can check the ports and service which are open against that port and information about the operating system installed on the machine. Use the command below from the Linux machine to get such information about the target machine :- <\/p>\n
nmap -O hostname or IP address <\/p>\n
For Ex- <\/p>\n
nmap -O 173.0.142.41<\/p>\n
Starting Nmap 5.51 ( http:\/\/nmap.org ) at 2013-07-09 20:39 CDT
Nmap scan report for mail5.gohsphere.com (173.0.142.41)
Host is up (0.00042s latency).
Not shown: 990 filtered ports<\/p>\n
——————————–
PORT\u00a0\u00a0\u00a0 STATE\u00a0 SERVICE
25\/tcp\u00a0 open\u00a0\u00a0 smtp
80\/tcp\u00a0 open\u00a0\u00a0 http
110\/tcp open\u00a0\u00a0 pop3
143\/tcp open\u00a0\u00a0 imap
443\/tcp open\u00a0\u00a0 https
465\/tcp open\u00a0\u00a0 smtps
587\/tcp open\u00a0\u00a0 submission
873\/tcp closed rsync
993\/tcp open\u00a0\u00a0 imaps
995\/tcp open\u00a0\u00a0 pop3s
——————————–<\/p>\n
Device type: general purpose|WAP|firewall|broadband router|webcam
Running (JUST GUESSING): Linux 2.6.X|2.4.X (97%), Linksys Linux 2.4.X (97%), Asus Linux 2.6.X (93%), Check Point Linux 2.4.X (92%), Netgear embedded (89%), AXIS Linux 2.6.X (88%)
Aggressive OS guesses: Linux 2.6.9 – 2.6.21 (97%), OpenWrt White Russian 0.9 (Linux 2.4.30) (97%), OpenWrt 0.9 – 7.09 (Linux 2.4.30 – 2.4.34) (97%), OpenWrt Kamikaze 7.09 (Linux 2.6.22) (97%), Linux 2.6.24 (94%), Asus RT-N16 WAP (Linux 2.6) (93%), Linux 2.6.18 (93%), OpenWrt Kamikaze 7.09 (Linux 2.6.17 – 2.6.21) (93%), Check Point NGX R65 firewall (Linux 2.4.21) (92%), Linux 2.6.20.6 (92%)
No exact OS matches for host (test conditions non-ideal).<\/p>\n
OS detection performed. Please report any incorrect results at http:\/\/nmap.org\/submit\/ .
Nmap done: 1 IP address (1 host up) scanned in 7.93 seconds<\/p>\n
It really helps to know about the open ports of the server which you’re using or to know about the services you can use on that port and also about the OS installed on the target machine.<\/p>\n
]]><\/p>\n","protected":false},"excerpt":{"rendered":"
Nmap (“Network Mapper”) is a utility for network discovery and security auditing. It is useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime. Using Nmap you can check the ports and service which are open against that port and information about the operating system installed on the […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[],"_links":{"self":[{"href":"http:\/\/www.jodohost.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/214"}],"collection":[{"href":"http:\/\/www.jodohost.com\/blog\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.jodohost.com\/blog\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.jodohost.com\/blog\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.jodohost.com\/blog\/index.php\/wp-json\/wp\/v2\/comments?post=214"}],"version-history":[{"count":0,"href":"http:\/\/www.jodohost.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/214\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.jodohost.com\/blog\/index.php\/wp-json\/wp\/v2\/media?parent=214"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.jodohost.com\/blog\/index.php\/wp-json\/wp\/v2\/categories?post=214"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.jodohost.com\/blog\/index.php\/wp-json\/wp\/v2\/tags?post=214"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}