1. Nmap

• Nmap (“Network Mapper”) is an open source tool for network exploration and security auditing. It was designed to rapidly scan large networks, although it works fine against single hosts. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristics. While Nmap is commonly used for security audits, many systems and network administrators find it useful for routine tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime.

2. Superscan tool

• SuperScan is a powerful connect-based TCP port scanner, pinger and hostname resolver. Multithreaded and asynchronous techniques make this program extremely fast and versatile.

4. Auto-scan

• AutoScan-Network is a network scanner (discovering and managing application). No configuration is required to scan your network. The main goal is to print the list of connected equipments in your network.

8. SoftPerfect Network Scanner 6.1.2

• SoftPerfect Network Scanner is a free multi-threaded IPv4/IPv6 scanner with a modern interface and many advanced features. It is intended for both system administrators and general users interested in computer security. The program pings computers, scans for listening TCP/UDP ports and discovers shared folders, including system and hidden ones.
• In addition, it can retrieve practically any information about network computers via WMI, SNMP, HTTP, NetBios and has a bunch of other features. It can also resolve host names and auto-detect the local and external IP address range. To assist with network administration, it supports remote shutdown and Wake-On-LAN.

9.Siltheris Network Scanner

• Slitheris is a new highly advanced network scanner capable of scanning 100 network devices in about 5 minutes! Most IP scanners detect the basics like the MAC Address but leave the OS field empty and dont even bother identifying device types. Our IP scanner uses standard multi-threaded ping sweeps to find pingable devices and uses ARP pings and other advanced network discovery technology to detect unpingable hidden devices. Other state-of-the-art features include operating system detection of Windows Linux iOS and Android using proprietary TCPUDP OS fingerprinting. Slitheris includes experimental network device type detection to find servers printers switches routers iPhones iPads and more using heuristic analysis and device type fingerprinting. Network device names are pulled from up to 10 different possible locations on each device assisting in detecting network device types. It even detects true case-sensitive PC names for Windows computers and servers. Slitheris Network Scanner comes in both freeware and Pro versions to suit the needs of all small medium and enterprise organizations. Even home users will find Slitheris Network Scanner extremely useful on their own home networks.

10. IP TOOL 2.70

• This award-winning tool consists of 20 network utilities that offer a large viriety of network administration and monitoring services. Utilities: Local Info, Connection Monitor, NetBIOS Scanner, Shared resources scanner, SNMP Scanner, HostName Scanner, Port Scanner, Ping Scanner, UDP Scanner, Trace, NS LookUp, Finger, WhoIs, Time Synchronizer, Telnet client, HTTP client, IP-Monitor, Host Monitor, SNMP Trap Watcher. All information program can save to log files. HostMonitor can show messages, play sound, send e-mail, execute external programs. All this is available from an attractive tabbed interface you'll find easy to negotiate. Other features include multi-threaded operation, audio support, custom appearance, system tray support, etc.

11. NetBScanner

• NetBScanner is a network scanner tool that scans all computers in the IP addresses range you choose, using NetBIOS protocol. For every computer located by this NetBIOS scanner, the following information is displayed: IP Address, Computer Name, Workgroup or Domain, MAC Address, and the company that manufactured the network adapter (determined according to the MAC address). NetBScanner also shows whether a computer is a Master Browser. You can easily select one or more computers found by NetBScanner, and then export the list into csv/tab-delimited/xml/html file.

12. NetworkConnectLog 1.06

• NetworkConnectLog is a simple utility that repeatedly scans your local area network (Using ARP and Netbios protocols) and add a new log line every time that a new computer or device connects to your network, and when a computer or device disconnects from your network. 
• After the connect/disconnect log lines are accumulated, you can easily export the log lines to comma-delimited/tab-delimited/html/xml file.

13. Lizard Systems Network Scanner 3.5

• Network scanner is an IP scanner for network analysis that will allow you to see all network computers in several seconds. It can scan an unlimited number of IP address ranges or computers from a list. It scans computers not only for NetBIOS resources, but also for running FTP and web services. It is possible to check access rights to resources during the scan process. Network scanner works really fast thanks to multi-thread scanning where every computer is scanned independently. You can change the number of computers scanned simultaneously. You can export the scan results to html, txt or xml.

 14. MiTec Network Scanner 4.0.0

• MiTeC Network Scanner is a robust, multi-threaded Port, IP, NetBIOS and SNMP scanner with many advanced features intended for both system administrators and general users who are interested in computer security. MiTeC Network Scanner performs ping sweeps, scans for opened TCP and UDP ports, resource shares and services. For devices with SNMP capability, available interfaces are detected and basic properties displayed. It also allows you to edit results, save/load results to/from CSV and print network device list and any data in any section can be exported to CSV. It can also resolve host names and auto-detect your local IP range.

 15. Nsauditor Network Security Auditor 3.0.6

• Nsauditor Network Security Auditor is an advanced network security scanner for auditing and monitoring network computers for possible vulnerabilities. The software checks network computers using all potential methods that a hacker might use to attack it. Nsauditor is a complete networking utilities package for network auditing, scanning, monitoring and more. Nsauditor discovers network services and checks them for vulnerabilities. The software retrieves all TCP and UDP endpoints and shows their associated processes. Nsauditor discovers NetBios names, allows to audit MS SQL servers, scan remote computers for common Adware traces and more. The program also includes real-time network packet filtering and analyzing, remote network performance and network status monitoring, web proxy scanning, password auditing features. Nsauditor has intrusion detection system and firewall system to stop internet threats and block unwanted network connections. 

 16. Network Inventory Advisor 4.3

• Network Inventory Advisor audits all network software and hardware simply and efficiently. It automatically discovers all your network assets (Windows, Mac OS, Linux, SNMP-powered devices & more), scans them and builds flexible network inventory reports. It helps you control and reduce your IT costs with automated agent-free network inventory. Network Inventory Advisor simplifies enterprise assets audit and ensures effective agent-free network inventory. Track all hardware changes, manage software licenses and collect invaluable network data remotely. Our high-end network inventory software optionally integrates with Active Directory to import your OUs and recognize your IT structure immediately.

17. Infiltrator Network Security Scanner 4.6

• Infiltrator is a free network security scanner that can quickly audit your network computers for possible vulnerabilities, exploits, and information enumerations. It comes with a built-in database of know vulnerabilities, that can be updated online and allows you to select the items to scan for or to add custom entries to be included. Infiltrator can reveal and catalog a variety of information, including installed software, shares, users, drives, hotfixes, NetBios and SNMP information, open ports and much more. It can also audit password and security policies, perform HTTP/CGI server auditing, registry auditing In addition, Infiltrator also comes with 19 network utilities for footprinting, scanning, enumerating and gaining access to machines (ping sweep, whois lookups, email tracing, share scanning and more). The program can be run from the commandline, allowing for external scheduling and automated scanning.

 18. YAPS 1.2.3.49

• Fast TCP/IP port scanner. It supports simultaneous connecting to many targets and command line and GUI mode. It has a customisable timeout and can scan range of addresses, or single address. Can resolve addresses and includes names for well known ports 

 19. Global Network Inventory 4.1.0.1

• Global Network Inventory is a powerful and flexible software and hardware inventory system that can be used as an audit scanner in an agent-free and zero deployment environments. If used as an audit scanner, it only requires full administrator rights to the remote computers you wish to scan. Global Network Inventory can audit remote computers and even network appliances, including hubs, network printers, document centers, etc. 
• Global Network Inventory agent can also be deployed to perform regular audits initiated through the domain login script when your users log on the network. In this scenario, Global Network Inventory agent is exported to a shared network directory, and audit results are collected in audit repository directory as snap files and later merged into the main database

 20. Professional Look at Net 2.2.8.2

• "professional Look at Net" is a portable network monitoring tools - net scanner, ports scanner and packets sniffer. The Network scanning don't required network administrator privilege, only host administrator right require for silent scanning and Ethernet frames or IP packets capturing. IP packets filtering on IP addresses, ports, outgoings, incomings and more. Possible auto save 500, 2000 or 5000 capturing packets, with viewing saved and capturing packets in ASCII and HEX (hexadecimal) mode. Also possible edit any other (no packets) source in HEX mode.

 21. WhatsUp Gold PortScanner Tool 1.0

• Understanding host vulnerabilities is a critical component of overall network security. As a network engineer, you are responsible for protecting your infrastructure from malware, worms, hackers, trojans, and viruses - reducing the opportunity for exploits to find their ways in is your mission!

• The WhatsUp Gold PortScanner tool makes sure all the doors on your network are locked and secure, providing the visibility you need to ensure your hosts are secure.

22. LAN Spider 2.3

• LAN Spider goes through your local area network to search the shared directories for certain files: documents, drawings, music & video files and many others. LAN Spider features include: Fast multi-thread search. LAN Spider is the fastest file searching utility: tests shows 300-500% increased performance over against all other utilities on the market. Archives support. LAN Spider unpacks archives and looks through the packed files automatically.

23. Rogue DHCP Server Detection 1.0

• Rogue DHCP Server Detection is a free tool from the Microsoft DHCP Team that enables network administrators to detect potentially rogue DNS servers on the subnet.The program scans the selected subnet and produces a list of all DHCP servers and marks the ones that have not been authorized by Active Directory.The scan can be performed manually or automatically every X minutes from the system tray

24. Medieval Bluetooth Network Scanner 1.4

• This program can analyze and scan your Bluetooth network, giving detailed informations about local and remote devices found. You can also browse supported services of each device in a clear and straightforward user-interface. Windows XP SP1 (or above) and Windows Vista are both fully supported. Works with native Microsoft Bluetooth stack only.

 25. MSR Strider URL Tracer 1.0.1.0

• When you visit a website, your browser may be instructed to visit other third-party domains without your knowledge. Some of these third-party domains raise security, privacy and safety concerns.
• The Strider URL Tracer is a tool that reveals these third-party domains and it includes a Typo-Patrol feature that generates and scans sites that capitalize on inadvertent URL misspellings, a process known as typo-squatting.
• The tool also enables parents to block typo-squatting domains that serve adult ads on typos of children´s Web sites.Requires Microsoft .NET Framework. (Note that .NET Framework is included in Windows XP. It is recommended to update to the latest version.)

26. LanSpy 2.0

• LanSpy is a suite of networking utilities for managing a network. But they can most certainly be used for a variety of different things. The application does a very simple thing: scan a computer host. You can, of course, define what happens during that scan. By default, it pings the host, it performs a variety of network checks and an open-port scan, both UDP and TCP. The information you can acquire from a single scan is quite useful. When I scanned a random computer on my network, I received information about the local time on that computer, about what version of windows they had, the MAC address, how many ports they had open, when the system started, what kind of shares were active, and a lot more. 

 27. WotWeb 1.08

• WotWeb is a cut-down port scanner specifically made to scan for and display active web servers and shows the server software running on them. IP lists can be entered manually or by reading from a file. Scanning is fast and accurate and the acquired list of servers can be saved to a comma separated text file for importing into your favorite spreadsheet application for further analysis.