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.

Bericht für us-mai-ohz.check-host.eu:80

Name: Check-Host us-mai-ohz.check-host.eu:80 UDP-Port-Erreichbarkeitstest
Author: Check-Host

Info Ping HTTP TCP UDP MTR DNS

report.report_types.udp us-mai-ohz.check-host.eu:80

Geprüft am Apr 21, 2026 06:35:46 UTC |

| Erneut prüfen |

Standort	Ergebnis	Zeit	IP-Adresse
Albania, Tirana	Timeout	-	31.57.177.131
Australia, Sydney	Timeout	-	31.57.177.131
Bosnia and Herzegovina, Novi Travnik	Timeout	-	31.57.177.131
Bulgaria, Sofia	Timeout	-	31.57.177.131
Canada, Montreal	Timeout	-	31.57.177.131
Switzerland, Bern	Timeout	-	31.57.177.131
Chile, Santiago	Timeout	-	31.57.177.131
China, Hohhot	Timeout	-	31.57.177.131
Germany, Nuernberg	Timeout	-	31.57.177.131
Germany, Frankfurt am Main	Timeout	-	31.57.177.131
Germany, Frankfurt am Main	Timeout	-	31.57.177.131
Germany, Limburg	Timeout	-	31.57.177.131
Germany, Frankfurt am Main	Timeout	-	31.57.177.131
Germany, Duesseldorf	Timeout	-	31.57.177.131
Denmark, Glostrup Municipality	Timeout	-	31.57.177.131
Spain, Bilbao	Timeout	-	31.57.177.131
Finland, Helsinki	Timeout	-	31.57.177.131
Finland, Helsinki	Timeout	-	31.57.177.131
France, Gravelines	Timeout	-	31.57.177.131
France, Paris	Timeout	-	31.57.177.131
United Kingdom, London	Timeout	-	31.57.177.131
Georgia, Tbilisi	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	us-mai-ohz.check-host.eu
Greece, Athens	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	us-mai-ohz.check-host.eu
Hong Kong, Hong Kong	Timeout	-	31.57.177.131
Croatia, Zagreb	Timeout	-	31.57.177.131
Hungary, Budapest	Timeout	-	31.57.177.131
Indonesia, Jakarta	Timeout	-	31.57.177.131
Israel, Petach Tikwa	Timeout	-	31.57.177.131
Israel, Netanja	Timeout	-	31.57.177.131
India, New Delhi	Timeout	-	31.57.177.131
Iceland, Reykjavik (Miðborg)	Timeout	-	31.57.177.131
Italy, Como	Timeout	-	31.57.177.131
Kuwait, Kuwait City	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	us-mai-ohz.check-host.eu
Lithuania, Pilaite	Timeout	-	31.57.177.131
Latvia, Riga	Timeout	-	31.57.177.131
Moldova, Chisinau	Timeout	-	31.57.177.131
Netherlands, Amsterdam	Timeout	-	31.57.177.131
Netherlands, Amsterdam	Timeout	-	31.57.177.131
Netherlands, Amsterdam	Timeout	-	31.57.177.131
Netherlands, Amsterdam	Timeout	-	31.57.177.131
Norway, Oslo	Timeout	-	31.57.177.131
Poland, Warsaw	Timeout	-	31.57.177.131
Romania, Bacău	Timeout	-	31.57.177.131
Romania, Bucharest	Timeout	-	31.57.177.131
Serbia, Belgrade	Timeout	-	31.57.177.131
Russia, St Petersburg	Timeout	-	31.57.177.131
Singapore, Singapore	Timeout	-	31.57.177.131
Turkey, Istanbul	Timeout	-	31.57.177.131
Taiwan, Taipei	Timeout	-	31.57.177.131
United States, Miami	Timeout	-	31.57.177.131
United States, Dallas	Timeout	-	31.57.177.131
United States, Kansas City	Timeout	-	31.57.177.131
United States, Dallas	Timeout	-	31.57.177.131
South Africa, Johannesburg	Timeout	-	31.57.177.131