If you have more hosts to scan and all host details are written in a file, you can directly ask nmap to read that file and perform scans.

Create a text file called “nmaptest.txt” and define all the IP addresses or hostname of the server that you want to do a scan.

cat nmaptest.txt

result:

nmaptest.txt

192.168.1.100
192.168.1.141
192.168.1.169

Next, run the following command with the iL option with nmap command to scan all listed IP address in the file.

nmap -iL nmaptest.txt

result:

Starting Nmap 6.40 ( http://nmap.org ) at 2016-07-07 23:47 BST
Nmap scan report for 192.168.1.100
Host is up (0.025s latency).
Not shown: 989 closed ports
PORT     STATE SERVICE
80/tcp   open  http
139/tcp  open  netbios-ssn
443/tcp  open  https
445/tcp  open  microsoft-ds
515/tcp  open  printer
631/tcp  open  ipp
6839/tcp open  unknown
7435/tcp open  unknown
8080/tcp open  http-proxy
9100/tcp open  jetdirect
9220/tcp open  unknown
 
Nmap scan report for android-d8443dafc4d5d365 (192.168.1.141)
Host is up (0.021s latency).
All 1000 scanned ports on android-d8443dafc4d5d365 (192.168.1.141) are closed
 
Nmap scan report for RP-AC52 (192.168.1.169)
Host is up (0.019s latency).
Not shown: 998 closed ports
PORT   STATE SERVICE
53/tcp open  domain
80/tcp open  http
 
Nmap done: 3 IP addresses (3 hosts up) scanned in 2.39 seconds