Port Checker

Check ports, domains, and public reachability in one place.

Enter a public hostname or IP, optionally pick a port, and Kordu Probe combines TCP, DNS, HTTP/HTTPS, and IP metadata into one clean answer. If you do specify a port, you still get the traditional open / closed / timeout semantics for the TCP path.

Run a public connectivity check

Run a public connectivity check for hostnames, IPs, ports, DNS, and web reachability.

API docs

Ready to run

Enter a target and hit Check to run the live connectivity probe.

Latency n/a

Check type Live check

Detected service Pending

Resolved IP No result yet

curl

curl -X HEAD -i https://example.com/

CLI

nc -vz 93.184.216.34 443

PowerShell

Resolve-DnsName -Name example.com

More commands & languages

telnet

telnet 93.184.216.34 443

Python

python -c "import socket; socket.create_connection(('93.184.216.34', 443), timeout=5)"

Node.js

node -e "require('net').createConnection({host:'93.184.216.34',port:443,timeout:5000},()=>console.log('open')).on('error',e=>console.log(e.code))"

conn, err := net.DialTimeout("tcp", "93.184.216.34:443", 5*time.Second)
if err != nil { fmt.Println(err); return }
conn.Close()

Ruby

ruby -rsocket -e "TCPSocket.new('93.184.216.34', 443).close; puts 'open'"

PHP

php -r '$s=@fsockopen("93.184.216.34", 443, $errno, $errstr, 5);
if($s){fclose($s); echo "open\n";} else {fwrite(STDERR, "$errstr\n"); exit(1);}'

Technical details

Checks run TCP, DNS, HTTP, IP

Probe source Cloudflare edge