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 TCP/UDP tools and library
About TCP/UDP tools
Find port number
Find port number by word
Check all open ports
IP range port scanner
 Ranges of ports in library
TCP ports list range 0-1024
TCP ports list range 1024-7000
TCP ports list range 7000-20000
TCP ports list range 20000-49151
UDP ports list range 0-1024
UDP ports list range 1024-7000
UDP ports list range 7000-20000
UDP ports list range 20000-49151

Check ALL open ports, scan open ports online free tool

This is page for check all open ports of some IP or domain name. It's high speed real time scan open ports online free tool that have NO LIMITS for scanning range, so you can scan even range 1-65565. Scanning of big ranges of ports is not forbidden but it will take lots of time (1-10 minutes). You also need to know that we have limits per IP and per destination for prevent harmful effect from scan. Our TCP port scan with nmap created for help people to discover which TCP ports are open on your destination host. You can click to check open ports for stop scan and reload page.

Ports range and comma separated list - both are allowed: 1-40,41,45,56,78,100-400
You will see scan results only after scan will be finished, but progress information will be available.
Starting from 13 Jan 2019 all scan that working longer then 10 minutes will be canceled automatically.
We advice to use shorter ports range or amount of IPs if it happens.
TCP SYN scan: it also called "half opened" connection, SYN package will be sent but connection procedure will not be finished.
TCP connect scan: just opening TCP connection to destination server, it taking more time.
TCP NULL scan: do not set any bits (TCP flag header is 0).
TCP FIN scan: sending TCP FIN bit to destination server.
TCP ACK scan: it commonly used for determinate firewall rules but not for get ports open/close status.
domain or ip:examples: or yahoo.com
ports list or range:examples: 10,22,33 or 10-30 or 10,12,30-40)
or scan all common ports:
scan method: