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.

Relatório para google.com:80

Info Ping HTTP TCP UDP MTR DNS

Verificar TCP google.com:80

Verificado em Oct 23, 2026 08:09:57 UTC |

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Local	Resultado	Tempo	Endereço IP
Australia, Sydney	Connected	0.0 ms	142.251.222.14
Bosnia and Herzegovina, Novi Travnik	Connected	17.0 ms	192.178.24.46
Bulgaria, Sofia	Connected	22.0 ms	142.251.27.139
Canada, Montreal	Connected	9.0 ms	74.125.197.101
Switzerland, Bern	Connected	1.0 ms	142.250.180.14
Switzerland, Zurich	Connected	14.0 ms	142.251.20.113
China, Hohhot	ERROR	-	142.250.73.78
Cyprus, Larnaca	Connected	9.0 ms	142.250.75.78
Germany, Nuernberg	Connected	4.0 ms	142.250.154.139
Germany, Frankfurt am Main	Connected	0.0 ms	142.251.13.139
Germany, Frankfurt am Main	Connected	0.0 ms	142.251.13.100
Germany, Frankfurt am Main	Connected	1.0 ms	142.251.13.139
Germany, Koblenz	Connected	23.0 ms	142.251.127.101
Germany, Frankfurt am Main	Connected	5.0 ms	142.251.20.100
Denmark, Glostrup Municipality	Connected	79.0 ms	216.58.201.206
Spain, Bilbao	Connected	38.0 ms	142.251.20.113
Spain, Barcelona	Connected	23.0 ms	172.217.20.46
Finland, Helsinki	Connected	7.0 ms	64.233.164.101
Finland, Helsinki	Connected	16.0 ms	74.125.205.100
France, Gravelines	Connected	13.0 ms	142.251.14.113
France, Paris	Connected	10.0 ms	172.217.22.46
United Kingdom, London	Connected	8.0 ms	142.250.117.102
Hong Kong, Hong Kong	Connected	1.0 ms	172.217.23.238
Croatia, Zagreb	Connected	24.0 ms	142.251.20.139
Hungary, Budapest	Connected	29.0 ms	142.251.14.100
Israel, Petach Tikwa	Connected	3.0 ms	142.250.75.110
Israel, Netanja	Connected	2.0 ms	142.250.75.206
Iran, Tehran	Connected	83.0 ms	142.251.38.142
Iran, Tehran	Connected	84.0 ms	142.251.38.142
Iceland, Reykjavik (Miðborg)	Connected	22.0 ms	172.253.116.138
Italy, Como	Connected	1.0 ms	142.251.27.100
Japan, Tokyo	Connected	2.0 ms	192.178.226.100
South Korea, Seoul	Connected	41.0 ms	142.251.118.138
Kazakhstan, Almaty	Connected	97.0 ms	172.217.19.238
Lithuania, Pilaite	Connected	101.0 ms	142.251.98.139
Latvia, Riga	Connected	115.0 ms	192.178.183.102
Netherlands, Amsterdam	Connected	1.0 ms	142.251.39.142
Netherlands, Amsterdam	Connected	3.0 ms	172.217.17.206
Netherlands, Amsterdam	Connected	2.0 ms	142.250.27.102
Netherlands, Amsterdam	Connected	1.0 ms	142.251.39.142
Netherlands, Eygelshoven	Connected	4.0 ms	142.251.142.206
Norway, Oslo	Connected	38.0 ms	142.251.38.110
Poland, Warsaw	Connected	20.0 ms	142.251.98.101
Romania, Bacău	Connected	39.0 ms	142.251.13.138
Romania, Bucharest	Connected	8.0 ms	172.217.18.174
Serbia, Belgrade	Connected	13.0 ms	192.178.24.78
Russia, Moscow	Connected	32.0 ms	142.250.178.46
Singapore, Singapore	Connected	16.0 ms	74.125.68.101
Tor, Onion	Connected	93.0 ms	google.com
Tor, Onion	Connected	166.0 ms	google.com
Tor, Onion	Connected	507.0 ms	google.com
Turkey, Istanbul	Connected	30.0 ms	192.178.194.138
Ukraine, Khmelnytskyi	Connected	14.0 ms	142.251.98.101
United States, Dallas	Connected	1.0 ms	142.251.186.138
United States, Los Angeles	Connected	30.0 ms	142.251.210.142
United States, Houston	Connected	7.0 ms	173.194.208.138
United States, Miami	Connected	2.0 ms	142.251.215.46
South Africa, Johannesburg	Connected	2.0 ms	142.251.47.206