4
Naabu
Naabu is a free, open-source command-line port scanner that finds valid ports on hosts.
Free planAPILinuxmacOSSelf-hosted
6.8Free plan
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5
ScanSearch
ScanSearch runs live, on-demand SYN scans and service detection to show current network exposure for specified targets.
Free planWebAPILinux
6.8From $0.30 a month
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6
NetsCLI
NetsCLI is an open-source network scanner for discovering LAN devices, scanning TCP and UDP ports, querying DNS, and inspecting hosts.
Free planLinuxmacOSWindows
6.6Free plan
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7
eslint-plugin-jsx-a11y
eslint-plugin-jsx-a11y is a free ESLint plugin that checks JSX in React applications for accessibility issues in static code.
Free plan
6.5Free plan
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8
Port Authority
Port Authority is a free Android port scanner for discovering network hosts and viewing information about the device and other hosts.
Free planAndroid
6.5$4.99 one-time
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9
RustScan
RustScan is a free, open-source command-line port scanner for finding open network ports.
Free planAndroidLinuxmacOSSelf-hosted
6.4Free plan
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10
HostedScan Security
HostedScan Security scans websites, servers, networks, and APIs for vulnerabilities, then presents findings in dashboards, alerts, and audit-ready reports.
WebAPI
6.3From $39 a month
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11
Unicornscan
Unicornscan is a free network reconnaissance tool that sends asynchronous, stateless probes and records responses.
Free planWebAPILinuxmacOS
6.2Free plan
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12
Windows Malicious Software Removal Tool
Windows Malicious Software Removal Tool (MSRT) is a free Windows utility for finding and removing prevalent malware threats and reversing changes they made.
Free planWindows
6.2Free plan
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13
Angry IP Scanner
Angry IP Scanner is a free, open-source desktop tool for scanning IP addresses and ports.
Free planLinuxmacOSWindows
6.1Free plan
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14
Nmap Online Scan
Nmap Online Scan is a web service for online network scanning and port discovery using Nmap.
Web
6.1$1.99 one-time
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15
Advanced Port Scanner
Advanced Port Scanner is free Windows desktop software for finding open network ports and identifying programs running on detected ports.
Free planWindows
6.0Free plan
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16
Sherlock Forensics Port Scanner
Sherlock Forensics Port Scanner is a free desktop GUI tool for identifying exposed TCP ports and the services using them.
Free planLinuxWindows
6.0Free plan
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17
HackerTarget TCP Port Scan
HackerTarget TCP Port Scan checks an IPv4 or IPv6 address for common open ports, helping assess an internet-facing service or firewall.
WebAPIExtension
5.9From $120 a year
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18
PortScan.com
PortScan.com checks TCP ports on the public IP address making the request and reports whether they are open, closed, or filtered.
Free planWebAPI
5.9Free plan
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19
PortScannerLabs
PortScannerLabs is a free web tool for checking an IP address or domain for common open, closed, or filtered network ports and flagging risky exposures.
Free planWeb
5.8Free plan
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20
Port Scanner Software
Port Scanner Software is Windows desktop software that scans specified hosts across server port ranges and reports which ports are open or closed.
Windows
5.6$19.99 one-time
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21
ZMap
ZMap is a free, open-source command-line scanner for Internet-wide network surveys.
LinuxmacOSSelf-hosted
5.6
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22
Farsight
Farsight is a free, self-hosted Linux scanner that uses SYN-based TCP scanning to collect service banners.
Linux
5.5
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23
Port Scanner ActiveX Control
Port Scanner ActiveX Control is paid Windows software for developers adding network port scanning to desktop applications.
Windows
5.5$300 one-time
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24
portwave
portwave is a free command-line scanner for IPv4 and IPv6 targets on Linux, macOS, and Windows.
LinuxmacOSWindows
5.5
Visit
25
SolarWinds Port Scanner
SolarWinds Port Scanner is the open-port scanning feature in Engineer’s Toolset, a network suite with more than 60 tools.
Self-hostedWindows
5.5
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