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 ge-tbi-9.check-host.eu:80

Name: Check-Host ge-tbi-9.check-host.eu:80 UDP Port Reachability Check
Author: Check-Host

Info Ping HTTP TCP UDP MTR DNS

report.report_types.udp ge-tbi-9.check-host.eu:80

Checked Apr 20, 2026 21:59:05 UTC |

| Check again |

Location	Result	Time	IP Address
Albania, Tirana	Timeout	-	188.93.91.194
Australia, Sydney	Timeout	-	188.93.91.194
Bosnia and Herzegovina, Novi Travnik	Timeout	-	188.93.91.194
Bulgaria, Sofia	Timeout	-	188.93.91.194
Canada, Montreal	Timeout	-	188.93.91.194
Switzerland, Bern	Timeout	-	188.93.91.194
Chile, Santiago	Timeout	-	188.93.91.194
China, Hohhot	Timeout	-	188.93.91.194
Germany, Nuernberg	Timeout	-	188.93.91.194
Germany, Frankfurt am Main	Timeout	-	188.93.91.194
Germany, Frankfurt am Main	Timeout	-	188.93.91.194
Germany, Limburg	Timeout	-	188.93.91.194
Germany, Frankfurt am Main	Timeout	-	188.93.91.194
Germany, Duesseldorf	Timeout	-	188.93.91.194
Denmark, Glostrup Municipality	Timeout	-	188.93.91.194
Spain, Bilbao	Timeout	-	188.93.91.194
Finland, Helsinki	Timeout	-	188.93.91.194
Finland, Helsinki	Timeout	-	188.93.91.194
France, Gravelines	Timeout	-	188.93.91.194
France, Paris	Timeout	-	188.93.91.194
United Kingdom, London	Timeout	-	188.93.91.194
Georgia, Tbilisi	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	ge-tbi-9.check-host.eu
Greece, Athens	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	ge-tbi-9.check-host.eu
Hong Kong, Hong Kong	Timeout	-	188.93.91.194
Croatia, Zagreb	Timeout	-	188.93.91.194
Hungary, Budapest	Timeout	-	188.93.91.194
Indonesia, Jakarta	Timeout	-	188.93.91.194
Israel, Petach Tikwa	Timeout	-	188.93.91.194
Israel, Netanja	Timeout	-	188.93.91.194
India, New Delhi	Timeout	-	188.93.91.194
Iceland, Reykjavik (Miðborg)	Timeout	-	188.93.91.194
Italy, Como	Timeout	-	188.93.91.194
Kuwait, Kuwait City	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	ge-tbi-9.check-host.eu
Lithuania, Pilaite	Timeout	-	188.93.91.194
Latvia, Riga	Timeout	-	188.93.91.194
Moldova, Chisinau	Timeout	-	188.93.91.194
Netherlands, Amsterdam	Timeout	-	188.93.91.194
Netherlands, Amsterdam	Timeout	-	188.93.91.194
Netherlands, Amsterdam	Timeout	-	188.93.91.194
Netherlands, Amsterdam	Timeout	-	188.93.91.194
Norway, Oslo	Timeout	-	188.93.91.194
Poland, Warsaw	Timeout	-	188.93.91.194
Romania, Bacău	Timeout	-	188.93.91.194
Romania, Bucharest	Timeout	-	188.93.91.194
Serbia, Belgrade	Timeout	-	188.93.91.194
Russia, St Petersburg	Timeout	-	188.93.91.194
Singapore, Singapore	Timeout	-	188.93.91.194
Turkey, Istanbul	Timeout	-	188.93.91.194
Taiwan, Taipei	Timeout	-	188.93.91.194
United States, Miami	Timeout	-	188.93.91.194
United States, Dallas	Timeout	-	188.93.91.194
United States, Kansas City	Timeout	-	188.93.91.194
United States, Dallas	Timeout	-	188.93.91.194
South Africa, Johannesburg	Timeout	-	188.93.91.194