Which are the best port scanners ?
What is a port scanner ?
Port scanners are key tools for network and systems security professionals. Fortunately, the best of these are free and/or Open Source.
What makes a great Port Scanner ?
Speed, flexibility, and accuracy are the important factors in determining the quality of a port scanning program. Port scanners often need to use “stealth” to pass through firewalls or elude Intrusion Detection and Prevention Systems (IDS / IPS). As firewalls and Intrusion Detection & Prevention techniques have improved, so have the best port scanning tools. Sometimes, you just need to run a port scan–and if you don’t have access to your regular tools or no way to install them, what to do? A couple of tests are hosted on web sites and can be run from anywhere you have web access. These web based port scans also can be handy to check firewall rules.
So here is a list of best port scanners:
1.Nmap
Network Mapper (Nmap) is a network scanning and host detection tool that is very useful during several steps of penetration testing. Nmap is not limited to merely gathering information and enumeration, but it is also powerful utility that can be used as a vulnerability detector or a security scanner. So Nmap is a multipurpose tool, and it can be run on many different operating systems including Windows, Linux, BSD, and Mac. Nmap is a very powerful utility that can be used to: Detect the live host on the network (host discovery) Detect the open ports on the host (port discovery or enumeration) Detect the software and the version to the respective port (service discovery) Detect the operating system, hardware address, and the software version Detect the vulnerability and security holes (Nmap scripts)
2.Netscan Tools
NetScanTools is a collection of over 40 network utilities for Windows, designed with an easy user interface in mind. It includes DNS tools, a ping and port scanner, traceroute, and other utilities.
3.Angry IP Scanner
Angry IP Scanner (or simply ipscan) is an open-source and cross-platform network scanner designed to be fast and simple to use. It scans IP addresses and ports as well as has many other features. It is widely used by network administrators and just curious users around the world, including large and small enterprises, banks, and government agencies.
4.Superscan
SuperScan is a powerful TCP port scanner that includes a variety of additional networking tools like ping, traceroute, HTTP HEAD, WHOIS and more. It uses multi-threaded and asynchronous techniques resulting in extremely fast and versatile scanning.
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