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

Enter a host and UDP port (e.g. 8.8.8.8:53) in the UDP checker. The tool sends protocol-appropriate payloads from 50+ global nodes — for example, a real DNS query to port 53 or an NTP request to port 123 — and reports whether a valid response was received from each location.

Why does UDP port testing require a payload?

Unlike TCP, UDP has no handshake. An empty packet sent to most UDP services produces no response because the application is waiting for meaningful data before replying. The tool automatically injects the correct payload for known ports (DNS/53, NTP/123, SNMP/161, game servers/27015) to get a real, meaningful response.

How do I test if my VPN UDP port is reachable?

Enter your VPN server IP and port (typically UDP 1194 for OpenVPN or UDP 51820 for WireGuard) and run the UDP check. Results from multiple global nodes will show whether your VPN port is accessible worldwide or blocked by specific ISPs or regional networks.

Can I test game server ports with this UDP checker?

Yes. For Source Engine game servers (CS:GO, TF2, Rust) on port 27015, the tool automatically sends a valid Source Engine query packet. For other game servers, you can enter a custom hex payload in the advanced options. Results show which global regions can reach your game server.

Relatório para za-joh-google.check-host.eu:80

Name: Check-Host za-joh-google.check-host.eu:80 Verificação de Porta UDP
Author: Check-Host

Info Ping HTTP TCP UDP MTR DNS

report.report_types.udp za-joh-google.check-host.eu:80

Verificado em Apr 30, 2026 15:15:35 UTC |

| Verificar novamente |

Local	Resultado	Tempo	Endereço IP
Albania, Tirana	Timeout	-	34.35.18.255
Australia, Sydney	Timeout	-	34.35.18.255
Bosnia and Herzegovina, Novi Travnik	Timeout	-	34.35.18.255
Bulgaria, Sofia	Timeout	-	34.35.18.255
Canada, Montreal	Timeout	-	34.35.18.255
Switzerland, Bern	Timeout	-	34.35.18.255
Chile, Santiago	Timeout	-	34.35.18.255
China, Hohhot	Timeout	-	34.35.18.255
Germany, Nuernberg	Timeout	-	34.35.18.255
Germany, Frankfurt am Main	Timeout	-	34.35.18.255
Germany, Frankfurt am Main	Timeout	-	34.35.18.255
Germany, Limburg	Timeout	-	34.35.18.255
Germany, Frankfurt am Main	Timeout	-	34.35.18.255
Denmark, Glostrup Municipality	Timeout	-	34.35.18.255
Spain, Bilbao	Timeout	-	34.35.18.255
Finland, Helsinki	Timeout	-	34.35.18.255
Finland, Helsinki	Timeout	-	34.35.18.255
France, Gravelines	Timeout	-	34.35.18.255
France, Paris	Timeout	-	34.35.18.255
United Kingdom, London	Timeout	-	34.35.18.255
Georgia, Tbilisi	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	za-joh-google.check-host.eu
Hong Kong, Hong Kong	Timeout	-	34.35.18.255
Croatia, Zagreb	Timeout	-	34.35.18.255
Hungary, Budapest	Timeout	-	34.35.18.255
Indonesia, Jakarta	Timeout	-	34.35.18.255
Israel, Petach Tikwa	Timeout	-	34.35.18.255
Israel, Netanja	Timeout	-	34.35.18.255
India, New Delhi	Timeout	-	34.35.18.255
Iceland, Reykjavik (Miðborg)	Timeout	-	34.35.18.255
Italy, Como	Timeout	-	34.35.18.255
Lithuania, Pilaite	Timeout	-	34.35.18.255
Latvia, Riga	Timeout	-	34.35.18.255
Moldova, Chisinau	Timeout	-	34.35.18.255
Netherlands, Amsterdam	Timeout	-	34.35.18.255
Netherlands, Amsterdam	Timeout	-	34.35.18.255
Netherlands, Amsterdam	Timeout	-	34.35.18.255
Netherlands, Amsterdam	Timeout	-	34.35.18.255
Norway, Oslo	Timeout	-	34.35.18.255
Poland, Warsaw	Timeout	-	34.35.18.255
Romania, Bacău	Timeout	-	34.35.18.255
Romania, Bucharest	Timeout	-	34.35.18.255
Serbia, Belgrade	Timeout	-	34.35.18.255
Russia, Moscow	Timeout	-	34.35.18.255
Saudi Arabia, Riyadh	Timeout	-	34.35.18.255
Singapore, Singapore	Timeout	-	34.35.18.255
Tor, Onion	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	za-joh-google.check-host.eu
Tor, Onion	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	za-joh-google.check-host.eu
Tor, Onion	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	za-joh-google.check-host.eu
Turkey, Istanbul	Timeout	-	34.35.18.255
Taiwan, Taipei	Timeout	-	34.35.18.255
United States, Miami	Timeout	-	34.35.18.255
United States, Dallas	Timeout	-	34.35.18.255
United States, Kansas City	Timeout	-	34.35.18.255
United States, Dallas	Timeout	-	34.35.18.255
South Africa, Johannesburg	Timeout	-	34.35.18.255