How do I check if a TCP port is open online?

Enter your server's IP address or domain followed by a colon and the port number (e.g. 1.1.1.1:80 or example.com:443) and run a TCP check. The tool attempts a TCP handshake from 65+ global nodes and reports whether each connection succeeded, was refused, or timed out.

What is the difference between a port being refused versus timing out?

A refused connection (TCP RST) means the port is actively closed — the server replied to reject the connection. A timeout means no reply was received at all, which typically indicates a firewall is silently dropping packets before they reach the server or application.

Which TCP ports can I test?

Any valid TCP port from 1 to 65535. Common examples include port 80 (HTTP), 443 (HTTPS), 22 (SSH), 25 (SMTP), 3306 (MySQL), 5432 (PostgreSQL), and 3389 (RDP). No login or special permissions required — the check only verifies whether the TCP handshake completes.

My port is open locally but fails from external nodes — why?

If a port works locally but fails from external nodes, something between the internet and your server is blocking it — commonly a cloud security group, iptables rule, upstream ISP filter, or geoblocking policy. Running the check from multiple regions helps identify whether the block is global or specific to certain countries or ASNs.

us-dal-private.check-host.eu:80 की रिपोर्ट

Name: Check-Host us-dal-private.check-host.eu:80 TCP पोर्ट कनेक्टिविटी परीक्षण
Author: Check-Host

जानकारी Ping HTTP TCP UDP MTR DNS

TCP चेक us-dal-private.check-host.eu:80

Jun 4, 2026 23:08:11 UTC को जाँचा गया |

| फिर से जाँचें |

स्थान	परिणाम	समय	IP पता
Albania, Tirana	ERROR	-	144.225.93.132
Australia, Sydney	ERROR	-	144.225.93.132
Bosnia and Herzegovina, Novi Travnik	ERROR	-	144.225.93.132
Bulgaria, Sofia	ERROR	-	144.225.93.132
Canada, Montreal	ERROR	-	144.225.93.132
Switzerland, Bern	ERROR	-	144.225.93.132
Switzerland, Zurich	ERROR	-	144.225.93.132
Chile, Santiago	ERROR	-	144.225.93.132
China, Hohhot	ERROR	-	144.225.93.132
Germany, Nuernberg	ERROR	-	144.225.93.132
Germany, Frankfurt am Main	ERROR	-	144.225.93.132
Germany, Frankfurt am Main	ERROR	-	144.225.93.132
Germany, Frankfurt am Main	ERROR	-	144.225.93.132
Germany, Duesseldorf	ERROR	-	144.225.93.132
Germany, Frankfurt am Main	ERROR	-	144.225.93.132
Denmark, Glostrup Municipality	ERROR	-	144.225.93.132
Spain, Bilbao	ERROR	-	144.225.93.132
Spain, Barcelona	ERROR	-	144.225.93.132
Finland, Helsinki	ERROR	-	144.225.93.132
Finland, Helsinki	ERROR	-	144.225.93.132
France, Gravelines	ERROR	-	144.225.93.132
France, Paris	ERROR	-	144.225.93.132
United Kingdom, London	ERROR	-	144.225.93.132
Georgia, Tbilisi	ERROR	-	us-dal-private.check-host.eu
Hong Kong, Hong Kong	ERROR	-	144.225.93.132
Croatia, Zagreb	ERROR	-	144.225.93.132
Hungary, Budapest	ERROR	-	144.225.93.132
Indonesia, Jakarta	ERROR	-	144.225.93.132
Israel, Petach Tikwa	ERROR	-	144.225.93.132
Israel, Netanja	ERROR	-	144.225.93.132
India, New Delhi	ERROR	-	144.225.93.132
Iceland, Reykjavik (Miðborg)	ERROR	-	144.225.93.132
Italy, Como	ERROR	-	144.225.93.132
Kazakhstan, Almaty	ERROR	-	144.225.93.132
Lithuania, Pilaite	ERROR	-	144.225.93.132
Latvia, Riga	ERROR	-	144.225.93.132
Moldova, Chisinau	ERROR	-	144.225.93.132
Netherlands, Amsterdam	ERROR	-	144.225.93.132
Netherlands, Amsterdam	ERROR	-	144.225.93.132
Netherlands, Amsterdam	ERROR	-	144.225.93.132
Netherlands, Amsterdam	ERROR	-	144.225.93.132
Netherlands, Eygelshoven	ERROR	-	144.225.93.132
Norway, Oslo	ERROR	-	144.225.93.132
Poland, Warsaw	ERROR	-	144.225.93.132
Romania, Bacău	ERROR	-	144.225.93.132
Romania, Bucharest	ERROR	-	144.225.93.132
Serbia, Belgrade	ERROR	-	144.225.93.132
Russia, Moscow	ERROR	-	144.225.93.132
Saudi Arabia, Riyadh	ERROR	-	144.225.93.132
Singapore, Singapore	ERROR	-	144.225.93.132
Tor, Onion	ERROR	-	us-dal-private.check-host.eu
Tor, Onion	ERROR	-	us-dal-private.check-host.eu
Tor, Onion	ERROR	-	us-dal-private.check-host.eu
Turkey, Istanbul	ERROR	-	144.225.93.132
Turkey, Istanbul	ERROR	-	144.225.93.132
Taiwan, Taipei	ERROR	-	144.225.93.132
Ukraine, Khmelnytskyi	ERROR	-	144.225.93.132
United States, Dallas	ERROR	-	144.225.93.132
United States, Kansas City	ERROR	-	144.225.93.132
United States, Dallas	ERROR	-	144.225.93.132
United States, Los Angeles	ERROR	-	144.225.93.132
United States, Houston	ERROR	-	144.225.93.132
United States, Miami	ERROR	-	144.225.93.132
South Africa, Johannesburg	ERROR	-	144.225.93.132