I've been using for this purpose. You can shorten this very long list by filtering results to only show the ports that are open. What is My IP has come up with a very nice free utility that gives you the opportunity to check a single IP address, but it has a unique option that no one else in the market seems to have thought of. It offers scans on themes of ports and services.
Free Port Scanner 3.5 only tests TCP ports. Allows you to discover which TCP ports are open on your target host and also to detect service information, operating system version and to do traceroute. If you have any questions about how to open or close ports on your network, please check out the Port Forwarding Questions Category.
This accomplishes by enabling port forwarding on your router and forward a connection to a special port. This issue with port 32764 is explained above in the TCP Ports to Test section. Honorable mention goes to the Shadowserver Foundation that scans the Internet for all sorts of things that should not be there.
Google for "scan ports" and you'll discover plenty of people offering this service already. Check http and https also udp and tcp. The interface detects your IP address when it launches and a selected list of ports to look at is also provided by default. You should check if port 1935 is blocked locally or on your network.
The port scanner tool will provide you with information regarding valid methods of connecting to a network. This command can only verify open port scan download portable (click through the following article) ports that is started by listenport command. This port scanner takes a different perspective from all the other programs in this list.
is a well known site that offers free web based network testing tools such as a ping test, traceroute, DNS lookup, WHOIS, reverse lookup, proxy checker, bandwidth meter, network and network mask calculator, detect country by IP, unit convertor and finally a port checker.
An online port scanner is a port scanner like any other port scanner. Useful open port checker to test the firewall software and to check if your Internet Service Provider is blocking specific ports (i.e BitTorrent). Nmap is a network port scanner that tests network connectivity between different hosts and services.