Port Checker
Check if TCP ports are open on any host or IP address — supports multiple ports at once with latency measurement
Port Checker
Check if TCP ports are open on any host
Quick-add common ports
How it works
The check is performed server-side by attempting a connection to the specified host and port. A port is marked open if a response (of any kind) is received within 5 seconds. Firewalls may cause ports to appear closed even when a service is running. Ports 1–65535 are supported; up to 20 ports per check.
Continue Exploring
Other Network Tools you might like...
IP Lookup
Look up IP address information including location and ISP
DNS Lookup
Query DNS records including A, AAAA, MX, TXT, and more
WHOIS Lookup
Look up domain registration and ownership information
HTTP Status Checker
Check HTTP status codes and response headers for any URL
SSL Certificate Checker
Check SSL certificate details, expiry, and validity for any domain
Port Reference Guide
Complete reference guide for common network ports and their services
Email Validator
Validate email addresses by checking format, MX records, and detecting disposable email providers
IP Geolocation
Look up the geographic location, ISP, and timezone of any IP address