Scan a host if it is protected by any packet filtering software or Firewalls.

sudo nmap -PN sharewiz.net

result:

Starting Nmap 6.40 ( http://nmap.org ) at 2016-07-08 00:35 BST
Nmap scan report for sharewiz.net (5.42.134.35)
Host is up (0.067s latency).
rDNS record for 5.42.134.35: bbdp5.42.134.35.network.sure.com
Not shown: 524 closed ports, 463 filtered ports
PORT    STATE SERVICE
21/tcp  open  ftp
22/tcp  open  ssh
25/tcp  open  smtp
53/tcp  open  domain
80/tcp  open  http
110/tcp open  pop3
139/tcp open  netbios-ssn
143/tcp open  imap
443/tcp open  https
445/tcp open  microsoft-ds
587/tcp open  submission
993/tcp open  imaps
995/tcp open  pop3s
 
Nmap done: 1 IP address (1 host up) scanned in 2.93 seconds