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 50+ 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.

google.com:80 की रिपोर्ट

जानकारी Ping HTTP TCP UDP MTR DNS

TCP चेक google.com:80

Apr 20, 2026 23:26:45 UTC को जाँचा गया |

| फिर से जाँचें |

स्थान	परिणाम	समय	IP पता
Albania, Tirana	Connected	101.0 ms	192.178.24.174
Australia, Sydney	Connected	0.0 ms	142.250.183.46
Bosnia and Herzegovina, Novi Travnik	Connected	48.0 ms	142.251.140.78
Bulgaria, Sofia	Connected	1.0 ms	192.178.25.238
Canada, Montreal	Connected	1.0 ms	142.250.69.142
Switzerland, Bern	Connected	3.0 ms	74.125.29.139
Chile, Santiago	Connected	1.0 ms	64.233.190.100
China, Hohhot	ERROR	-	142.250.73.110
Germany, Nuernberg	Connected	5.0 ms	142.250.154.102
Germany, Frankfurt am Main	Connected	9.0 ms	172.217.22.110
Germany, Frankfurt am Main	Connected	0.0 ms	142.251.14.138
Germany, Limburg	Connected	2.0 ms	142.251.110.100
Germany, Frankfurt am Main	Connected	0.0 ms	142.251.14.101
Germany, Duesseldorf	Connected	7.0 ms	74.125.71.101
Denmark, Glostrup Municipality	Connected	12.0 ms	192.178.25.14
Spain, Bilbao	Connected	38.0 ms	142.251.13.100
Finland, Helsinki	Connected	4.0 ms	142.251.38.78
Finland, Helsinki	Connected	7.0 ms	172.217.19.238
France, Gravelines	Connected	11.0 ms	142.251.14.113
France, Paris	Connected	47.0 ms	142.251.39.110
United Kingdom, London	Connected	6.0 ms	142.250.140.100
Georgia, Tbilisi	ERROR	-	google.com
Greece, Athens	ERROR	-	google.com
Hong Kong, Hong Kong	Connected	3.0 ms	172.217.171.110
Croatia, Zagreb	Connected	24.0 ms	142.251.110.138
Hungary, Budapest	Connected	15.0 ms	172.217.171.174
Indonesia, Jakarta	Connected	0.0 ms	64.233.170.102
Israel, Petach Tikwa	Connected	1.0 ms	142.250.75.110
Israel, Netanja	Connected	3.0 ms	142.250.75.46
India, New Delhi	Connected	1.0 ms	142.251.43.174
Iceland, Reykjavik (Miðborg)	Connected	36.0 ms	172.217.23.238
Italy, Como	Connected	30.0 ms	142.250.181.174
Kuwait, Kuwait City	ERROR	-	google.com
Lithuania, Pilaite	Connected	57.0 ms	172.217.19.238
Latvia, Riga	Connected	31.0 ms	142.250.102.102
Moldova, Chisinau	Connected	68.0 ms	192.178.24.174
Netherlands, Amsterdam	Connected	0.0 ms	142.251.142.206
Netherlands, Amsterdam	Connected	3.0 ms	192.178.25.206
Netherlands, Amsterdam	Connected	0.0 ms	172.217.23.238
Netherlands, Amsterdam	Connected	0.0 ms	142.251.209.238
Norway, Oslo	Connected	32.0 ms	209.85.203.102
Poland, Warsaw	Connected	15.0 ms	142.251.98.102
Romania, Bacău	Connected	34.0 ms	142.251.20.101
Romania, Bucharest	Connected	8.0 ms	172.217.168.110
Serbia, Belgrade	Connected	31.0 ms	142.251.20.101
Russia, St Petersburg	Connected	12.0 ms	172.217.19.238
Singapore, Singapore	Connected	0.0 ms	142.251.10.102
Turkey, Istanbul	Connected	10.0 ms	142.251.142.110
Taiwan, Taipei	Connected	1.0 ms	142.250.204.46
United States, Miami	Connected	64.0 ms	142.251.35.110
United States, Dallas	Connected	18.0 ms	172.253.135.102
United States, Kansas City	Connected	35.0 ms	209.85.145.113
United States, Dallas	Connected	4.0 ms	142.251.116.138
South Africa, Johannesburg	Connected	0.0 ms	192.178.54.46