Naabu vs PortScannerLabs

Naabu is a free, open-source command-line port scanner for identifying valid ports on hosts, with SYN, CONNECT, and UDP probes. It accepts hosts, IP addresses, CIDR ranges, and ASNs directly, from a file, or through standard input. Results can be emitted as JSON, CSV, text, or standard output. It supports IPv4 and experimental IPv6 scanning, DNS port scans, passive enumeration through Shodan InternetDB, and experimental host discovery. Naabu can work with Nmap for service discovery and version detection, and discovered ports can be piped to ProjectDiscovery's httpx to identify running HTTP servers. The CLI can upload or display scan results in the ProjectDiscovery Cloud dashboard. Installation options include ready-to-run binaries, Docker, and Go. Packet capture requires libpcap on Linux or macOS, or Npcap on Windows. Service version detection needs a local Nmap service-probe database or a custom path. The README recommends running as root for best results and adjusting scan flags and rate on local systems.

PortScannerLabs is a free cloud web tool for checking an IP address or domain for common open, closed, or filtered network ports. It flags risky exposures and separates port state from risk level, with links to guidance about the service and ways to close it. The scanner uses nmap with service and version detection for open ports. A default scan checks 12 common TCP ports, including SSH, Telnet, MySQL, RDP, HTTP, and HTTPS. Leaving the target blank scans the user’s public IP as seen from outside the network. Scans with version detection can take up to 15 seconds. No account, signup, or installation is required. The site describes the tool for home and small-business users, IT administrators, developers, gamers, and self-hosters. Users must confirm authorization before scanning another target. PortScannerLabs rate-limits scans and restricts full-range scanning of arbitrary targets for anonymous users. It says it retains only minimal technical logs needed to operate the service and prevent abuse, and does not sell personal data. The Free port scanner costs nothing.