Portleak
I do a fair bit of security work and kept hitting the same problem. I needed to know which ports a restrictive network will actually let out. Scanning from the inside isn't enough, because a firewall or intermediary device can happily report a port as open when nothing is really
Port Leak Checker Port Leak Checker inbound TCP SYN / UDP capture — anything shown here reached this host Scan scripts → About this tool & how to scan it Port Leak Checker passively records inbound TCP SYN and UDP packets that reach this server. Point a device under test at this server's IP and send traffic (or scan) across the ports and protocols you want to verify — every probe that actually arrives is logged below with its source IP, protocol, destination port and time. Filter by the test device's source IP to isolate your own traffic. Because packets are captured as they arrive on the wire, anything shown here genuinely traversed the full network path: an intermediary that fakes an “open” port during a scan cannot make a real packet appear her
Port Leak Checker Port Leak Checker inbound TCP SYN / UDP capture — anything shown here reached this host Scan scripts → About this tool & how to scan it Port Leak Checker passively records inbound TCP SYN and UDP packets that reach this server. Point a device under test at this server's IP and send traffic (or scan) across the ports and protocols you want to verify — every probe that actually arrives is logged below with its source IP, protocol, destination port and time. Filter by the test device's source IP to isolate your own traffic. Because packets are captured as they arrive on the wire, anything shown here genuinely traversed the full network path: an intermediary that fakes an “open” port during a scan cannot make a real packet appear her
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