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.

us-dal-private.check-host.eu:80 のレポート

Name: Check-Host us-dal-private.check-host.eu:80 UDP ポート到達性チェック
Author: Check-Host

Info Ping HTTP TCP UDP MTR DNS

report.report_types.udp us-dal-private.check-host.eu:80

Apr 21, 2026 07:39:06 UTC に確認 |

| 再チェック |

拠点	結果	応答時間	IP アドレス
Albania, Tirana	Timeout	-	144.225.93.132
Australia, Sydney	Timeout	-	144.225.93.132
Bosnia and Herzegovina, Novi Travnik	Timeout	-	144.225.93.132
Bulgaria, Sofia	Timeout	-	144.225.93.132
Canada, Montreal	Timeout	-	144.225.93.132
Switzerland, Bern	Timeout	-	144.225.93.132
Chile, Santiago	Timeout	-	144.225.93.132
China, Hohhot	Timeout	-	144.225.93.132
Germany, Nuernberg	Timeout	-	144.225.93.132
Germany, Frankfurt am Main	Timeout	-	144.225.93.132
Germany, Frankfurt am Main	Timeout	-	144.225.93.132
Germany, Limburg	Timeout	-	144.225.93.132
Germany, Frankfurt am Main	Timeout	-	144.225.93.132
Germany, Duesseldorf	Timeout	-	144.225.93.132
Denmark, Glostrup Municipality	Timeout	-	144.225.93.132
Spain, Bilbao	Timeout	-	144.225.93.132
Finland, Helsinki	Timeout	-	144.225.93.132
Finland, Helsinki	Timeout	-	144.225.93.132
France, Gravelines	Timeout	-	144.225.93.132
France, Paris	Timeout	-	144.225.93.132
United Kingdom, London	Timeout	-	144.225.93.132
Georgia, Tbilisi	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	us-dal-private.check-host.eu
Greece, Athens	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	us-dal-private.check-host.eu
Hong Kong, Hong Kong	Timeout	-	144.225.93.132
Croatia, Zagreb	Timeout	-	144.225.93.132
Hungary, Budapest	Timeout	-	144.225.93.132
Indonesia, Jakarta	Timeout	-	144.225.93.132
Israel, Petach Tikwa	Timeout	-	144.225.93.132
Israel, Netanja	Timeout	-	144.225.93.132
India, New Delhi	Timeout	-	144.225.93.132
Iceland, Reykjavik (Miðborg)	Timeout	-	144.225.93.132
Italy, Como	Timeout	-	144.225.93.132
Kuwait, Kuwait City	UDP checks unavailable: SOCKS5 proxy does not support UDP ASSOCIATE	-	us-dal-private.check-host.eu
Lithuania, Pilaite	Timeout	-	144.225.93.132
Latvia, Riga	Timeout	-	144.225.93.132
Moldova, Chisinau	Timeout	-	144.225.93.132
Netherlands, Amsterdam	Timeout	-	144.225.93.132
Netherlands, Amsterdam	Timeout	-	144.225.93.132
Netherlands, Amsterdam	Timeout	-	144.225.93.132
Netherlands, Amsterdam	Timeout	-	144.225.93.132
Norway, Oslo	Timeout	-	144.225.93.132
Poland, Warsaw	Timeout	-	144.225.93.132
Romania, Bacău	Timeout	-	144.225.93.132
Romania, Bucharest	Timeout	-	144.225.93.132
Serbia, Belgrade	Timeout	-	144.225.93.132
Russia, St Petersburg	Timeout	-	144.225.93.132
Singapore, Singapore	Timeout	-	144.225.93.132
Turkey, Istanbul	Timeout	-	144.225.93.132
Taiwan, Taipei	Timeout	-	144.225.93.132
United States, Miami	Timeout	-	144.225.93.132
United States, Dallas	Timeout	-	144.225.93.132
United States, Kansas City	Timeout	-	144.225.93.132
United States, Dallas	Timeout	-	144.225.93.132
South Africa, Johannesburg	Timeout	-	144.225.93.132