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Port scanner
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| · | Scan servers, workstations and firewalls, find and close TCP ports that should not be open
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| · | Detect viruses, Trojan horses
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| · | Detect unauthorized Internet software - chat programs, FTP servers etc.
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| · | Detect different operating systems - different OS'es uses different ports
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| · | There are 65536 TCP ports per IP address on a computer with the TCP/IP protocol installed.
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| · | All programs that listens and responds to Internet traffic has at least one open port.
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| · | Most services has a default port; FTP = 21, WWW = 80 etc., but the port number can be changed.
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| · | A port scanner can scan (try to connect to) some or all ports and report open ones.
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| · | It is possible to block incoming ports by using a firewall. Some firewalls can also tell you if anyone, in order to find a weak point, uses a port scanner on your network.
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| · | The port scanner can be used in both domain, machine and lookup-IP mode
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| · | Scan a single port or one or many ranges
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| · | Scan up to 100 hosts simultaneously
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| · | Scan up to 200 concurrent ports
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| · | User defined time-out
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| · | NTinfo displays port names along with listening ports. (The port names are taken from the list of the local computer and may not be correct. If something looks suspect - check which processes that runs on the machine.)
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| 1. | In the "IP address or name" field, enter a domain name (domain01)
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| 2. | Under the "Network" label, check the "IP address" checkbox
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| 3. | Under the "Network" label, check the "Port scanner" checkbox
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| 4. | Click "Scan"
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| 1. | In the "IP address or name" field, enter a Windows computer name (server01)
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| 2. | Under the "Network" label, check the "IP address" checkbox
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| 3. | Under the "Network" label, check the "Port scanner" checkbox
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| 4. | Click "Scan"
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| 1. | In the "IP address or name" field, enter a single IP-name (www.mydomain12.net), a single IP address (192.168.0.1), or a range of IP addresses (192.168.0.1-255)
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| 2. | Under the "Network" label, check the "Port scanner" checkbox
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| 3. | Click "Scan"
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| · | One port per row, one property per column, see port scanner data format.
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| · | Press Ctrl+Shift + click the "Port scanner" label to open the options dialog:
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Setting
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Description
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Ports to scan
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Ports to scan, comma delimited list, single numbers or one or many ranges. The fewer number of ports, the faster will the scan be.
Examples
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Concurrent IPs
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Number of concurrent IP addresses, maximum 100. Some firewalls may limit this number.
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Concurrent ports per IP
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Number of concurrent ports per IP address. Some OS'es may limit this number.
PortScannerConcurrentPortsPerIp multiplied by PortScannerConcurrentIPs = concurrent connections, the more concurrent connections, the faster will the port scanner work. Number of concurrent connections can not be higher than 2000. Some firewalls may also limit number of concurrent connections. Please notice that a high number of concurrent connections will use a high amount of CPU power and network bandwidth. | |||||||||
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Timeout
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Time to wait for connection in milliseconds, maximum 10000. Set this number at lowest possible value to increase scan speed.
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