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 pl-war-fns.check-host.eu:80

Name: Check-Host pl-war-fns.check-host.eu:80 Проверка доступности UDP
Author: Check-Host

Info Ping HTTP TCP UDP MTR DNS

report.report_types.udp pl-war-fns.check-host.eu:80

Checked Apr 21, 2026 00:42:02 UTC |

| Check again |

Location	Result	Time	IP Address
Albania, Tirana	Timeout	-	85.237.212.100
Australia, Sydney	Timeout	-	85.237.212.100
Bosnia and Herzegovina, Novi Travnik	Timeout	-	85.237.212.100
Bulgaria, Sofia	Timeout	-	85.237.212.100
Canada, Montreal	Timeout	-	85.237.212.100
Switzerland, Bern	Timeout	-	85.237.212.100
Chile, Santiago	Timeout	-	85.237.212.100
China, Hohhot	Timeout	-	85.237.212.100
Germany, Nuernberg	Timeout	-	85.237.212.100
Germany, Frankfurt am Main	Timeout	-	85.237.212.100
Germany, Frankfurt am Main	Timeout	-	85.237.212.100
Germany, Limburg	Timeout	-	85.237.212.100
Germany, Frankfurt am Main	Timeout	-	85.237.212.100
Germany, Duesseldorf	Timeout	-	85.237.212.100
Denmark, Glostrup Municipality	Timeout	-	85.237.212.100
Spain, Bilbao	Timeout	-	85.237.212.100
Finland, Helsinki	Timeout	-	85.237.212.100
Finland, Helsinki	Timeout	-	85.237.212.100
France, Gravelines	Timeout	-	85.237.212.100
France, Paris	Timeout	-	85.237.212.100
United Kingdom, London	Timeout	-	85.237.212.100
Georgia, Tbilisi	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	pl-war-fns.check-host.eu
Greece, Athens	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	pl-war-fns.check-host.eu
Hong Kong, Hong Kong	Timeout	-	85.237.212.100
Croatia, Zagreb	Timeout	-	85.237.212.100
Hungary, Budapest	Timeout	-	85.237.212.100
Indonesia, Jakarta	Timeout	-	85.237.212.100
Israel, Petach Tikwa	Timeout	-	85.237.212.100
Israel, Netanja	Timeout	-	85.237.212.100
India, New Delhi	Timeout	-	85.237.212.100
Iceland, Reykjavik (Miðborg)	Timeout	-	85.237.212.100
Italy, Como	Timeout	-	85.237.212.100
Kuwait, Kuwait City	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	pl-war-fns.check-host.eu
Lithuania, Pilaite	Timeout	-	85.237.212.100
Latvia, Riga	Timeout	-	85.237.212.100
Moldova, Chisinau	Timeout	-	85.237.212.100
Netherlands, Amsterdam	Timeout	-	85.237.212.100
Netherlands, Amsterdam	Timeout	-	85.237.212.100
Netherlands, Amsterdam	Timeout	-	85.237.212.100
Netherlands, Amsterdam	Timeout	-	85.237.212.100
Norway, Oslo	Timeout	-	85.237.212.100
Poland, Warsaw	Timeout	-	85.237.212.100
Romania, Bacău	Timeout	-	85.237.212.100
Romania, Bucharest	Timeout	-	85.237.212.100
Serbia, Belgrade	Timeout	-	85.237.212.100
Russia, St Petersburg	Timeout	-	85.237.212.100
Singapore, Singapore	Timeout	-	85.237.212.100
Turkey, Istanbul	Timeout	-	85.237.212.100
Taiwan, Taipei	Timeout	-	85.237.212.100
United States, Miami	Timeout	-	85.237.212.100
United States, Dallas	Timeout	-	85.237.212.100
United States, Kansas City	Timeout	-	85.237.212.100
United States, Dallas	Timeout	-	85.237.212.100
South Africa, Johannesburg	Timeout	-	85.237.212.100