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 bg-sof-aluy.check-host.eu:80

Name: Check-Host bg-sof-aluy.check-host.eu:80 Verificação de Porta UDP
Author: Check-Host

Info Ping HTTP TCP UDP MTR DNS

report.report_types.udp bg-sof-aluy.check-host.eu:80

Verificado em Apr 21, 2026 23:43:23 UTC |

| Verificar novamente |

Local	Resultado	Tempo	Endereço IP
Albania, Tirana	Timeout	-	45.137.201.251
Australia, Sydney	Timeout	-	45.137.201.251
Bosnia and Herzegovina, Novi Travnik	Timeout	-	45.137.201.251
Bulgaria, Sofia	Timeout	-	45.137.201.251
Canada, Montreal	Timeout	-	45.137.201.251
Switzerland, Bern	Timeout	-	45.137.201.251
Chile, Santiago	Timeout	-	45.137.201.251
China, Hohhot	Timeout	-	45.137.201.251
Germany, Nuernberg	Timeout	-	45.137.201.251
Germany, Frankfurt am Main	Timeout	-	45.137.201.251
Germany, Frankfurt am Main	Timeout	-	45.137.201.251
Germany, Limburg	Timeout	-	45.137.201.251
Germany, Frankfurt am Main	Timeout	-	45.137.201.251
Germany, Duesseldorf	Timeout	-	45.137.201.251
Denmark, Glostrup Municipality	Timeout	-	45.137.201.251
Spain, Bilbao	Timeout	-	45.137.201.251
Finland, Helsinki	Timeout	-	45.137.201.251
Finland, Helsinki	Timeout	-	45.137.201.251
France, Gravelines	Timeout	-	45.137.201.251
France, Paris	Timeout	-	45.137.201.251
United Kingdom, London	Timeout	-	45.137.201.251
Georgia, Tbilisi	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	bg-sof-aluy.check-host.eu
Greece, Athens	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	bg-sof-aluy.check-host.eu
Hong Kong, Hong Kong	Timeout	-	45.137.201.251
Croatia, Zagreb	Timeout	-	45.137.201.251
Hungary, Budapest	Timeout	-	45.137.201.251
Indonesia, Jakarta	Timeout	-	45.137.201.251
Israel, Petach Tikwa	Timeout	-	45.137.201.251
Israel, Netanja	Timeout	-	45.137.201.251
India, New Delhi	Timeout	-	45.137.201.251
Iceland, Reykjavik (Miðborg)	Timeout	-	45.137.201.251
Italy, Como	Timeout	-	45.137.201.251
Kuwait, Kuwait City	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	bg-sof-aluy.check-host.eu
Lithuania, Pilaite	Timeout	-	45.137.201.251
Latvia, Riga	Timeout	-	45.137.201.251
Moldova, Chisinau	Timeout	-	45.137.201.251
Netherlands, Amsterdam	Timeout	-	45.137.201.251
Netherlands, Amsterdam	Timeout	-	45.137.201.251
Netherlands, Amsterdam	Timeout	-	45.137.201.251
Netherlands, Amsterdam	Timeout	-	45.137.201.251
Norway, Oslo	Timeout	-	45.137.201.251
Poland, Warsaw	Timeout	-	45.137.201.251
Romania, Bacău	Timeout	-	45.137.201.251
Romania, Bucharest	Timeout	-	45.137.201.251
Serbia, Belgrade	Timeout	-	45.137.201.251
Russia, St Petersburg	Timeout	-	45.137.201.251
Singapore, Singapore	Timeout	-	45.137.201.251
Turkey, Istanbul	Timeout	-	45.137.201.251
Taiwan, Taipei	Timeout	-	45.137.201.251
United States, Miami	Timeout	-	45.137.201.251
United States, Dallas	Timeout	-	45.137.201.251
United States, Kansas City	Timeout	-	45.137.201.251
United States, Dallas	Timeout	-	45.137.201.251
South Africa, Johannesburg	Timeout	-	45.137.201.251