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.

Report for ru-stp-baxet.check-host.eu:80

Name: Check-Host ru-stp-baxet.check-host.eu:80 UDP Port Reachability Check
Author: Check-Host

Info Ping HTTP TCP UDP MTR DNS

report.report_types.udp ru-stp-baxet.check-host.eu:80

Checked Apr 20, 2026 21:59:15 UTC |

| Check again |

Location	Result	Time	IP Address
Albania, Tirana	Timeout	-	194.87.69.212
Australia, Sydney	Timeout	-	194.87.69.212
Bosnia and Herzegovina, Novi Travnik	Timeout	-	194.87.69.212
Bulgaria, Sofia	Timeout	-	194.87.69.212
Canada, Montreal	Timeout	-	194.87.69.212
Switzerland, Bern	Timeout	-	194.87.69.212
Chile, Santiago	Timeout	-	194.87.69.212
China, Hohhot	Timeout	-	194.87.69.212
Germany, Nuernberg	Timeout	-	194.87.69.212
Germany, Frankfurt am Main	Timeout	-	194.87.69.212
Germany, Frankfurt am Main	Timeout	-	194.87.69.212
Germany, Limburg	Timeout	-	194.87.69.212
Germany, Frankfurt am Main	Timeout	-	194.87.69.212
Germany, Duesseldorf	Timeout	-	194.87.69.212
Denmark, Glostrup Municipality	Timeout	-	194.87.69.212
Spain, Bilbao	Timeout	-	194.87.69.212
Finland, Helsinki	Timeout	-	194.87.69.212
Finland, Helsinki	Timeout	-	194.87.69.212
France, Gravelines	Timeout	-	194.87.69.212
France, Paris	Timeout	-	194.87.69.212
United Kingdom, London	Timeout	-	194.87.69.212
Georgia, Tbilisi	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	ru-stp-baxet.check-host.eu
Greece, Athens	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	ru-stp-baxet.check-host.eu
Hong Kong, Hong Kong	Timeout	-	194.87.69.212
Croatia, Zagreb	Timeout	-	194.87.69.212
Hungary, Budapest	Timeout	-	194.87.69.212
Indonesia, Jakarta	Timeout	-	194.87.69.212
Israel, Petach Tikwa	Timeout	-	194.87.69.212
Israel, Netanja	Timeout	-	194.87.69.212
India, New Delhi	Timeout	-	194.87.69.212
Iceland, Reykjavik (Miðborg)	Timeout	-	194.87.69.212
Italy, Como	Timeout	-	194.87.69.212
Kuwait, Kuwait City	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	ru-stp-baxet.check-host.eu
Lithuania, Pilaite	Timeout	-	194.87.69.212
Latvia, Riga	Timeout	-	194.87.69.212
Moldova, Chisinau	Timeout	-	194.87.69.212
Netherlands, Amsterdam	Timeout	-	194.87.69.212
Netherlands, Amsterdam	Timeout	-	194.87.69.212
Netherlands, Amsterdam	Timeout	-	194.87.69.212
Netherlands, Amsterdam	Timeout	-	194.87.69.212
Norway, Oslo	Timeout	-	194.87.69.212
Poland, Warsaw	Timeout	-	194.87.69.212
Romania, Bacău	Timeout	-	194.87.69.212
Romania, Bucharest	Timeout	-	194.87.69.212
Serbia, Belgrade	Timeout	-	194.87.69.212
Russia, St Petersburg	Timeout	-	194.87.69.212
Singapore, Singapore	Timeout	-	194.87.69.212
Turkey, Istanbul	Timeout	-	194.87.69.212
Taiwan, Taipei	Timeout	-	194.87.69.212
United States, Miami	Timeout	-	194.87.69.212
United States, Dallas	Timeout	-	194.87.69.212
United States, Kansas City	Timeout	-	194.87.69.212
United States, Dallas	Timeout	-	194.87.69.212
South Africa, Johannesburg	Timeout	-	194.87.69.212